POV-Ray

The Persistence of Vision Raytracer (POV-Ray).

This is the legacy Bug Tracking System for the POV-Ray project. Bugs listed here are being migrated to our github issue tracker. Please refer to that for new reports or updates to existing ones on this system.

IDCategoryTask Type  ascReported InPrioritySeveritySummaryStatusProgressDue In Version
25AnimationDefinite Bug3.70 beta 32DeferLowPause sometimes fails when rendering animationTracked on GitHub
90%
Task Description

There is an issue where the pause button in POVWIN will sometimes not work during an animation (primarily where the frame rate is high), and furthermore, POVWIN can then get into a state where it’s not possible to use the pause until it is re-started.

Newsgroup report.

42OtherDefinite Bug3.70 beta 32Very LowMediumcommand line parameters are not parsed properly on UnixTracked on GitHub
0%
Task Description

POV-Ray does not follow common practice on command-line handling; for instance:

povray +i"My File"

entered on a Unix shell would be passed to POV-Ray as

povray
+iMy File

(each line representing a distinct parameter here), which POV-Ray would further dissect, interpreting it as

povray
+iMy
File

To achieve the desired effect, one would actually have to quote the string twice:

povray +i"'My File'"

which the shell would translate to

povray
+i'My File'

which POV-Ray would interpret as

povray
+iMy File

In both cases, this is obviously not what a Unix user would expect.

The further dissecting of individual command-line parameters may have had its valid roots in the peculiarities of DOS’ command-line handling, but to my knowledge all major contemporary operating systems follow a concept akin to Unix, passing a list of parameters instead of a monolithic command line, and burdening the respective command shells with the task of dissecting command lines into parameters.

Therefore I suggest to disable this anachronistic feature in favor of contemporary standards; a compiler flag might be used to allow for easy re-enabling of the feature, for compiling POV-Ray on exotic targets.

- edit -

It has been pointed out that the described behaviour differs from 3.6, so I’m promoting this to a bug and changing the title.

81Geometric PrimitivesDefinite Bug3.62Very LowMediumsphere_sweep generating artifactsTracked on GitHub
0%
Task Description

I’m running POV-Ray for (64 bit) Windows v3.62 on (64 bit) Windows Vista

This pov file:


#include "colors.inc"
#include "metals.inc"

light_source { <6, 9, -21> color White }
camera { location <0, 0, -3> look_at <0, 0, 0> }

sphere_sweep {
                cubic_spline
                6
                <-2.0, 0, 0> 0.05

                <0.000,0,0> 0.2
                <0.025,0,0> 0.2
                <0.050,0,0> 0.2
                <0.075,0,0> 0.2

                <3.0,0,0> 0.2
                pigment { color White }
}

Produces two strange artifacts: A disk at the center of the sweep, and a faint “halo” or veil which shows as 4 faint hyperbolas centered around the origin.

I have tried tweaking tolerance (for no other reason than I saw that someone else was tweaking it to solve a problem) but this does not seem to change things.

For a look at MY result when I run this, view this image:

riventree.comarchivebugdatapovrayspheresweepartifacts.jpg

Alain reports the same behavior in the latest version: “It’s still there with the latest version: 3.7 beta 35a.” This MAY move the status to “confirmed”, but I can’t do that

Someone else says that changing the scale (!) “solves” the problem by moving the disk and the halo offscreen, but that sounds like a bad idea to me.

-Jeff Evarts, first-time POVRay bug reporter

202Geometric PrimitivesDefinite Bug3.70 RC3Very LowLowNumerical oddities in Julia_FractalTracked on GitHub
0%
Task Description

I understand that some things have changed in the way certain computations in POV-Ray decide when something is “good enough” and I think this is biting me in Julia_Fractal (where, of course, the highest-resolution computations are needed).

The bug has been posted here:

http://news.povray.org/povray.bugreports/thread/%3Cweb.4dbf2e26b56a53c15b4449250%40news.povray.org%3E/

Including a short .pov file and instructions that reproduce it.

(It pops up in other configurations and view angles as well, but this one captures in in a way that makes it clear it’s a bug: the distance of the camera from the origin appears to change the shape of the rendered object).

This appeared first on a Windows Server 2003 machine, it is apparently confirmable on at least one other system as per that thread.

237User interfaceDefinite Bug3.70 RC3DeferVery LowGlitch in displaying rendered pixels and percentageTracked on GitHub
0%
Task Description

When rendering in multiple passes (radiosity in my case), the elapsed pixels and percentage, written to terminal
are first displayed like this:
Rendered 126202 of 360000 pixels (35%)
Then on the second stage the output text becomes shorter and you see
Rendered 25344 of 360000 pixels (7%)%)
The contents of the previous status are not erased, so the longer text persists (note the duplicate percentage sign and closing parenthesis). Such a glitch could have more drastic effect in rare cases.

I’m running
Version 3.7.0.RC3 (g++ 4.6.2 x86_64-unknown-linux-gnu)
compiled for the Arch Linux package.

252PhotonsDefinite Bug3.70 RC6Very LowLowphotons and light_group is brokenTracked on GitHub
0%
Task Description

photons are not working when used with a light_group. verified in NG posting in p.general a simple scene file is attached.

273OtherDefinite Bug3.70 RC6Very LowMediumNo automatic backup files from inc filesTracked on GitHub
0%
Task Description

If enabled, POVray always created backups of pov and inc files once per session.
Now using 3.7 RC6 only pov file backups are created but not from inc files.

295User interfaceDefinite Bug3.70 RC7Very LowLowMinor GUI BugsTracked on GitHub
0%
Task Description

Here are two low-priority bugs in POV-Ray’s GUI, observed by me under Windows XP, which should be easy to fix I think:

  • In the “Insert” menu, there are sub-menus (e.g. “Radiosity and Photons”) in which there are menu seperators at the end of the popped-up menu bar.
  • The progress bar in the top-right corner of the editor window seems to be too large for the window (203px) and therefore clipped. As a result, progress seems to be 100% when it is not yet, e.g. at 90% progress. (Have not measured exactly.)

Both bugs are not severe at all, but it would be nice if they could be fixed.
By the way, a second progress bar could be added to visualize the number of frames already rendered in an animation.

301OtherDefinite Bug3.70 RC7Very LowLowFallback to default image size causes wrong values to b...Tracked on GitHub
50%
Task Description

When resolution is not specified (neither via POVRAY.INI nor via QUICKRES.INI nor via command line or custom .ini file), random values are displayed for image resolution in the Image Output Options message output. (The actual render will be performed at the default size of 160×120 pixels though.)

303OtherDefinite Bug3.70 RC7DeferVery Lowwrong bit depth reported for OpenEXR file formatTracked on GitHub
0%
Task Description

When using OpenEXR output file format, POV-Ray erroneously reports it as “24 bpp EXR” in the message output, while in fact it generates a 3×16 = 48 bpp file.

313RadiosityDefinite Bug3.70 releaseLowHighradiosity.cpp pov::RadiosityFunction::BeforeTile assert...Tracked on GitHub
20%
Task Description

With 3.7.0 final, rendering attached files (for Computer Engineering college course),
which renders without issues in povray 3.6.1, fails with following error:

...
==== [Rendering...] ========================================================
povray: backend/lighting/radiosity.cpp:324: virtual void pov::RadiosityFunction::BeforeTile(int, unsigned int): Assertion `(pts >= PRETRACE_FIRST) && (pts <= PRETRACE_MAX)' failed.

Command line:

povray +K0.6500 \
+FN +Q9 +MB1 \
+W600 +H400 \
+AM1 +A0.0 +R2 \
+D +SP32 +EP4 \
+L/usr/share/povray-3.7/include \
+Imain.pov \
+Omain-0.6500.png

Using Arch Linux testing current:
Linux archmidi 3.12.0-1-ARCH #1 SMP PREEMPT Wed Nov 6 09:06:27 CET 2013 x86_64 GNU/Linux

Downstream bug report:
https://bugs.archlinux.org/task/37689

321OtherDefinite Bug3.70 releaseVery LowLowbounding threshold inconsistencyTracked on GitHub
90%
Task Description

User reported documentation inconsistency. Investigation led to the discovery of a bug in the setting of the current default value.

~source/frontend/renderfrontend.cpp reports the value “3” while ~source/backend/scene/scene.cpp sets a default value of “1”

Before for addressing this issue, are there any thoughts as to what the default value should be?

324Geometric PrimitivesDefinite Bug3.70 releaseVery LowHigh3.7 mesh2 rendering artifact, regression from 3.6Tracked on GitHub
0%
Task Description

Povray 3.7 has rendering artifact in meshes with polygons that meet at shallow angles. Please see the attached file.

The part of concern is the mesh2, which produces the partly-transparent faces of a shallow pyramid. The file result-3_6.png shows the output of povray-3.6, and the file result-3_7.png shows the output of povray-3.7. In 3.7, you can see a thin light-colored margin all around the base of the pyramid, especially thick under the top cylinder. In 3.6, this artifact is absent. For comparison purposes, I have inserted a “#version 3.6;” directive at the top of the file so that the output images are as close to each other as possible. However, the artifact is still present in 3.7 without this directive.

The attached scene file is only a small part of a much larger scene, where this artifact shows up in numerous very obvious places, where it doesn’t in 3.6. I have hunted in the documentation and online for ways to solve this problem, but haven’t found anything. Because of this, I am forced to stay with 3.6 for production use, which is quite unfortunate since I’d like to take advantage of the new features of 3.7.

326OtherDefinite Bug3.70 releaseVery LowLowrestricted setting ignored in 3.7Tracked on GitHub
0%
Task Description

Due to a typo in the conf file parser (introduced, I think, in refactoring after 3.6), the restricted setting is ignored, and access checks aren’t performed.

Fixing this reveals some other issues:

  • %INSTALLDIR%/../../etc is incompletely canonicalized to /usr/local/share/../etc, not /usr/local/etc
  • read+write paths are added to the read list only, so writing is impossible

See attached patch.

Relatedly, I think it would be nice to add a new replacement token %CONFDIR% instead of %INSTALLDIR%/../../etc.

Also, there’s a realpath function that could simplify path handling, though I’m not sure if it’s available on all platforms.

328User interfaceDefinite Bug3.70 releaseVery LowMediumAscii char '=' in filenames causes command line parsing...Tracked on GitHub
0%
Task Description

The following command fails with parsing error:
povray +OqXfFbD0Vg5XjZgi5sOefkvdF_oCGrZ1ChVhrQw==.png +IqXfFbD0Vg5XjZgi5sOefkvdF_oCGrZ1ChVhrQw==.pov +W1000 +H1000

The following command succeeds:
povray +OqXfFbD0Vg5XjZgi5sOefkvdF_oCGrZ1ChVhrQw.png +IqXfFbD0Vg5XjZgi5sOefkvdF_oCGrZ1ChVhrQw.pov +W1000 +H1000

Any option that gets a filename as parameter will fail if it contains ‘=’.

It is a regression, as it worked fine with 3.6.

296Geometric PrimitivesDefinite Bug3.70 RC7DeferMediummax gradient computation is not thread safe (isosurface...Tracked on GitHub
0%
3.71 release Task Description

It appears as a side effect of investigation of #294: the code in isosurf.cpp, inside
bool IsoSurface::Function_Find_Root_R(ISO_ThreadData& itd, const ISO_Pair* EP1, const ISO_Pair* EP2, DBL dt, DBL t21, DBL len, DBL& maxg)

	if(gradient < temp)
		gradient = temp;

is not thread-safe (The code is used at render time, there is a data race between < and = operation, as gradient is stored in the global object and accessed in write mode by the cited code)

It is only important if the gradient is initially undervaluated (otherwise, all is fine, no write-access)

306Subsurface ScatteringDefinite Bug3.70 RC7Very LowHighfinish subsurface block before global_settings subsurfa...Tracked on GitHub
0%
3.71 release Task Description

The following scene causes a crash:

sphere {
  <0,0,0>, 1
  finish { subsurface { translucency 1.0 } }
}

global_settings {
  subsurface { }
}
309Parser/SDLDefinite Bug3.70 RC7Very LowLowWarning Message MissingTracked on GitHub
0%
3.71 release Task Description

Draw_Vistas, Light_Buffer, and Vista_Buffer (plus associated switches) do not issue warning when used, even tho code has been disabled.

26Geometric PrimitivesDefinite Bug3.61Very LowLowArtifacts rendering a cloth which has two-side texturesTracked on GitHub
0%
Future release Task Description

Dear PovRay maintainers and developers, congratulations for your great RayTracer!

We think that we have found a bug while we were rendering a piece of cloth.

In this piece of cloth were defined two textures, one for one side and one for the another side:

  texture { mesh_tex0_0 }
  interior_texture { mesh_tex0_1 }
  • Please: Look at line 77414 of the attached file “test.pov” to see

these definitions in their original context.

We have found some artifacts in the final rendering, in concrete near some wrinkles,
please, look at the attached file “render_artifacts.tga”, I have painted a big green arrow
near the artifacts, maybe you’ll need to do a zoom to see them more accurately.

They are as though the texture of the other side was painted in the incorrect side.

Fortunately, we have a patch to fix this bug (thanks to Denis Steinemann, he made the
implementation for PovRay 3.5, so I have adapted these changes to release 3.6.1)

Although we have found this bug in the Windows and Linux 3.6.1 releases,
the patch was generated in Linux (using the source code release of “povray-3.6.1”).

To apply this patch, inside the parent folder of the directory “povray-3.6.1” execute:

            patch -p0 < other_side_artifacts.patch

And the “povray-3.6.1” will be patched and you will get a console output like this:

 patching file povray-3.6.1/source/lighting.cpp
 patching file povray-3.6.1/source/mesh.cpp
 patching file povray-3.6.1/source/render.cpp

We don’t know if this “hack” is enough smart to apply in the next release,
but we think that it fixes the bug (the artifacts dissapear).

Best regards and thank you very much for your great RayTracer!

60Geometric PrimitivesDefinite Bug3.70 beta 34Very LowMediumArtifacts using prism in CSGTracked on GitHub
0%
Future release Task Description

Using prisms in intersecion or difference CSG objects may cause artifacts in POV-Ray 3.6.2 as well as 3.7.0.beta.34, as demonstrated by the following code:


camera {
  right    -x
  up        y*image_height/image_width
  location  <-24,19,12>
  look_at   <0,0,0>
}

light_source { <100,200,100> color rgb 1 }

plane { y, -2 pigment { color rgb 1 } }


#declare KeyValue = 1.366; // pick any you like

difference {
  prism {
    linear_sweep -0.5,0.5, 4
    
    <-3,20-17>,
    <-3,KeyValue>,
    <-6,-3>,
    <-0,-5>
  }
  intersection {
    cylinder { <-7,-0.51,1>, <-7, 0.51,1>, 4.0 }
    plane { z, KeyValue }
  }
  pigment { color rgb 0.5 } 
}

Apparently the surface of the other object becomes visible when it exactly coincides with a vertex of the prism; probably there is a failure of the inside() test for such values.

196Subsurface ScatteringDefinite Bug3.70 RC3Very LowLowMore SSLT CaveatsTracked on GitHub
90%
Future release Task Description

when a prism is differenced with a primitive (cylinder in this case) if sslt is used it causes a seq fault. Reference distribution file logo.inc and the Povray_Logo_Prism definition.

222Geometric PrimitivesDefinite Bug3.70 RC3Very LowLowincorrect render of CSG merge with radiosityTracked on GitHub
0%
Future release Task Description

The problem arises when I am trying to trace a radiosity scene without conventional lighting that has a GSG merge object. There are a coincident surfaces, but these surfaces are first merged, then the texture applied. The texture is a simple solig color non-transfluent pigment, default normal, default finish etc..

Problem consists when adding antialiasing, changing resolution, changing camera view-point etc.; when I replace merge with union, the problem disappeared.

The scene was checked on two different machines with different versions of POV-Ray:

  1. Gentoo Linux, kernel 2.6.39-r3, i686 Intel(R) Xeon(TM) CPU 2.80GHz GenuineIntel, 2G RAM (this is Dell PowerEdge 2650 server with 2 dual-core Intel Xeon MP processors); Persistence of Vision™ Ray Tracer Version 3.7.0.RC3 (i686-pc-linux-gnu-g++ 4.5.3 @ i686-pc-linux-gnu)
  2. Gentoo Linux, kernel 2.6.37-r4, x86_64 AMD Athlon™ X2 Dual Core Processor BE-2350, 2G RAM (non-branded machine); Persistence of Vision™ Ray Tracer Version 3.6.1 (x86_64-pc-linux-gnu-g++ 4.4.4 @ x86_64-pc-linux-gnu)

(scene has been adapted slightly to be rendered with 3.6, the adaptation was to change “emission” with “ambient” and replace gamma “srgb” with “2.2”)

Both machines generate similar images.

The attachment is an archive containing sources of minimal scenes with these problems, and sample pictures I generated from them on my machines.

275Light sourceDefinite Bug3.70 RC7Very LowLowcircular area lights exhibit anisotropyTracked on GitHub
50%
Future release Task Description

circular area lights exhibit some anisotropy, being brighter along the diagonals than on average, as can be demonstrated with the following scene:

//+w800 +h800
#version 3.7;
global_settings{assumed_gamma 1}
plane{-z,-10 pigment{rgb 1} finish{ambient 0 brilliance 0}}
disc{0,z,10000,0.5}
camera{orthographic location z look_at 10*z up y*12 right x*12}
light_source{-10*z rgb 10 area_light 10*x 10*y 257 257 adaptive 4 circular}
287Light sourceDefinite Bug3.70 RC7Very LowLowarea_illumination shadow calculationTracked on GitHub
50%
Future release Task Description

not sure if this is something needing further work or an intended effect.

Shadows from and area light with area_illumination on seem to follow the same shadow calculation as a standard area light by giving more weight to lights near the center of the array. I would assume the shadows would be calculated similarly to individual lights in the same pattern as the array by evenly distributing the amount of shadow equally for each light. But this is not what I see.

The code sample below when rendered with scene 1 will show shadows grouped near the center from the area light with area_illumination. If scene 1 is commented out and scene 2 is uncommented then rendered, you will see evenly distributed shadows from individual lights. Area lighting with area_illumination I would assume should give a result identical to scene 2. If scene 1 is rendered with area_illumination off, the shadow calculation is exactly the same as with area_illumination on.

example images rendered on win32 XP

#version 3.7;

global_settings {
 ambient_light 0
 assumed_gamma 1
}

camera {
  location <0, 3, -5>
  look_at <0, 2, 0>
}

background { rgb <.3, .5, .8> }
plane { y,0 pigment { rgb .7 } }
torus { 1.5,.1 rotate 90*x translate 4*z pigment { rgb .2 } }
plane { -z,-7 pigment { rgb .7 } }

/*
// scene 1
light_source{
  y
  1
  area_light 3*x, z, 7, 1
  area_illumination on
}
union {
 sphere { 0,.05 }
 sphere { .5*x,.05 }
 sphere { x,.05 }
 sphere { 1.5*x,.05 }
 sphere { -.5*x,.05 }
 sphere { -x,.05 }
 sphere { -1.5*x,.05 }
 translate y
  hollow pigment { rgbt 1 } interior { media { emission 10 } }
}
// end scene 1
*/


// scene 2
#declare Light = light_source {
  0
  1/7
  looks_like { sphere { 0,.05 hollow pigment { rgbt 1 } interior { media { emission 10 } } } }
}

union {
 object { Light }
 object { Light translate .5*x }
 object { Light translate x }
 object { Light translate 1.5*x }
 object { Light translate -.5*x }
 object { Light translate -x }
 object { Light translate -1.5*x }
 translate y
}
// end scene 2

20User interfaceFeature Request3.70 beta 32Very LowVery Lowrender window behaviorTracked on GitHub
0%
Task Description

When changing the behavior of the render window, “Keep above main”, requires restarting the POV editor to take effect. It would be nice either to get a warning to restart, or to get it to work without restarting.

41OtherFeature Request3.70 beta 32Very LowLowimprove command-line parsing error messagesTracked on GitHub
0%
Task Description

POV-Ray 3.6, upon encountering problems when parsing command line and/or .ini file options, would quote the offending option in the error message.

POV-Ray 3.7 currently just reports that there is some problem with the command line, without providing any details. I suggest changing this, as the information may be helpful at times.

138User interfaceFeature Request3.70 beta 37aVery LowLow"Rename" option in File menuTracked on GitHub
0%
Task Description

Would be great if there were a “Rename” option in the editor File menu to rename the current file name. Otherwise, you have to close the file, rename it in file manager, then open the file again, thus loosing the current tab position and undo history for the file.

140Platform-specificFeature Request3.70 beta 37aVery LowLow"Reload" option in File menuTracked on GitHub
0%
Task Description

Would be great to have a “Reload” option in the File menu to manually reload the current file from disk, discarding all subsequent changes since the last save.

145Parser/SDLFeature Request3.70 beta 37aVery LowLowStack trace report on errorTracked on GitHub
10%
Task Description

In other languages if you encounter an error you’ll often be presented with a stack trace showing not only the file and line number the error occurred at, but also any calling functions and _their_ calling functions and so on.

Currently, Povray reports the line number of the error as well as the last five or so lines prior to the error. This is usually OK in simple scenes, but breaks down when you start making use of inclusion and macros.

Let’s say you have a macro located in a file that you then include in your scene. Within your scene you call the macro multiple times, passing input to it. However, by accident you pass _invalid_ input to the macro at some point, resulting in an error when parsing. In this case Povray will report the error as belonging to the macro whereas the actual bug exists in the calling code. If the macro is called more than once in your scene it can be difficult to figure out _which_ instance is the one supplying the bad input.

Not sure how much of this is achievable in Povray.

177Light sourceFeature Request3.70 beta 39Very LowLowAdd support for conserve_energy to shadow computationsTracked on GitHub
0%
Task Description

The following scene gives a comparison of current conserve_energy handling in standard shadow computations vs. photons.

Note how the rather highly reflective slabs fail to cast shadows, except where the photons target sphere enforces computation of shadow brightness to be done by the photons algorithm.

For more realistic shadowing without the need to enable photons, I suggest do add proper conserve_energy handling to the shadow computation code (which shouldn’t be too much effort).

global_settings {
  max_trace_level 10
  photons { spacing 0.003 media 10 }
}

camera {
  right x*image_width/image_height
  location  <-2,2.6,-10>
  look_at   <0,0.75,0>
}

light_source {
  <500,300,150>
  color rgb 1.3
  photons {
    refraction on
    reflection on
  }
}

sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.6,0.7,1.0>]
      [0.7 rgb <0.0,0.1,0.8>]
    }
  }
}

plane {
  y, 0
  texture { pigment { color rgb 0.7 } }
}

#declare M_Glass=
material {
  texture {
    pigment {rgbt 1}
    finish {
      ambient 0.0
      diffuse 0
      specular 0.2 // just to give a hint where the sphere is
    }
  }
  interior { ior 1.0 }
}

#declare M_PseudoGlass=
material {
  texture {
    pigment {rgbt 1}
    finish {
      ambient 0.0
      diffuse 0.5
      specular 0.6
      roughness 0.005
      reflection { 0.3, 1.0 fresnel on }
      conserve_energy
    }
  }
  interior { ior 1.5 }
}


sphere {
  <1.1,1,-1.3>, 1
  material { M_Glass }
  photons {
    target 1.0
    refraction on
    reflection on
  }
}

// behind target object
box {
  <-0.2,0,-2.3>, <0.0,4,0.3>
  material { M_PseudoGlass }
  rotate z*1 // just to better see the reflection of the horizon
}

// before target object
box {
  <2.4,0,-2.3>, <2.6,4,-0.3>
  material { M_PseudoGlass }
  photons { pass_through }
  rotate z*1 // just to better see the reflection of the horizon
}
178Texture/Material/FinishFeature Request3.70 beta 39Very LowLowModify metallic reflection code to better work with con...Tracked on GitHub
0%
Task Description

The combination of metallic reflection with conserve_energy causes the reflection to lose colour, as demonstrated by the following scene:

global_settings {
  max_trace_level 10
}

camera {
  right x*image_width/image_height
  location  <-2,2.6,-10>
  look_at   <0,0.75,0>
}

light_source {
  <500,300,150>
  color rgb 1.3
}

sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.6,0.7,1.0>]
      [0.7 rgb <0.0,0.1,0.8>]
    }
  }
}

plane {
  y, 0
  texture { pigment { color rgb 0.7 } }
}

#declare M=
material {
  texture {
    pigment {rgbt <1.0,0.7,0.2,0.99>}
    finish {
      ambient 0.0
      diffuse 0.5
      specular 0.6
      roughness 0.005
      reflection { 0.8, 1.0 metallic }
      conserve_energy
    }
  }
  interior { ior 1.5 }
}

box {
  <-0.2,0,-2.3>, <0.0,4,0.3>
  material { M }
  rotate z*5
  rotate x*2
}
229Image formatFeature Request3.70 RC3Very LowLowClock value into EXIF data for PNGTracked on GitHub
0%
Task Description

The best time for a picture....

I set the day time and so the position of the sun by “clock=”

Normal I document my source very good, but this time,
I forgot the clock seting for the picture of my book cover.

So I would find it very practicall to put the clock value
and other setings for rendering
into EXIF data of the picture.

230User interfaceFeature Request3.70 RC3Very LowLowImproved handling of animationsTracked on GitHub
0%
Task Description

October to middle November, I prodduced a 5 minutes video mainly py POVRAY.

Here a part of the video.ini file

#

# szenes based on games.pov
#

#game-pat
#Initial_Frame=450 - time scale 1000 - 30 seconds
#Final_Frame=899
#Initial_Clock=-12500
#Final_Clock=17500

#game-lost - time scale 1000 - 22 seconds
#Initial_Frame=0
#Final_Frame=659
#Initial_Clock=2000
#Final_Clock=24000

#game-lost - time scale 3000 - 12 seconds - fast through the night
#Initial_Frame=0
#Final_Frame=359
#Initial_Clock=24000
#Final_Clock=60000

#book-cover
#clock=64000

#game-sunrise - time scale 1000 - 35 seconds
#Initial_Frame=0
#Final_Frame=1049
#Initial_Clock=60000
#Final_Clock=95000

Now imagine all the problems:

One computer crashes often because of thermal problems.
Last picture rendere 487.

Now calculate the setings, that this computer continues the task at 487

Or 2 computers should render a scene.

Sounds very easy. Something like computer 1 makes 0..499 computer 2 makes 500..999.

But the computers are different in speed and the pictures are
very different in computation time.

So it would be best

computer 1: 0 to 999
computer 2: 999 to 0

They would meet in the middle, where ever this middle is.

So it would be much easier with

#game-sunrise - time scale 1000 - 35 seconds
Initial_Frame=0
Final_Frame=1049
Initial_Clock=60000
Final_Clock=95000
Initial_Task=487
Final_Task=1049

So I have not to calculate the exact clock seting,
when a computer sould continue a task after crashing at picture 487

#game-sunrise - time scale 1000 - 35 seconds
Initial_Frame=0
Final_Frame=1049
Initial_Clock=60000
Final_Clock=95000
Initial_Task=1049
Final_Task=0

This would be the reverse calcualtion order.
Starting with picture 1049 and going down 1048..1047

240Geometric PrimitivesFeature Request3.70 RC3Very LowLowObject for efficient automatic periodic pavementTracked on GitHub
0%
Task Description

Whenever some object is to be periodically repeated in some kind of grid, you can achieve this with macros, but it
a) wastes a lot of resources

 even if object references are implemented in the future, wrapper with its own transformation matrix still takes space and bookkeeping

b) is not infinite

 annoying when making infinite planar tiling with arbitrary objects
 like an approximate water surface or tiling with real bricks
 or anything that needs to extend to horizon

c) is not optimized for periodicity

I think it can be very efficiently implemented as an object that takes a finite object argument (like CSG functions) and can be periodic in either 1D,2D or (possibly dangeorous?) 3D with specified period. In each dimension, the number of repetitions can be any integer or even infinity (or max_int). Something like
periodicity <2,2,Infinity> 2 copies in 1 direction, 2 in the other, infinite in the third
grid_separation <1,2,2>
1 unit size in first direction, 2 unit sizes in the other two

All the code needs to do is raytrace in the current unit cell and if the ray passes uninterrupted, pass it through the neighbouring unit cell (which means trace a translated ray through the same object). The object itself would just feel an additional clipping box, everything else would work seamlessly.

In case of infinite column of transparent object, max_trace stops the infinite loop anyway.

This is just a suggestion, I realize this is more of a long-term change but it is quite easy to implement and would simplify a large number of projects.

242OtherFeature RequestAllDeferVery LowAlgorithm to fix the so-called shadow line artifactTracked on GitHub
0%
Task Description

The so-called shadow line artifact (http://wiki.povray.org/content/Knowledgebase:The_Shadow_Line_Artifact) which affects objects with a ‘normal’ statement as well as smooth meshes and heightfields can be really annoying sometimes. Currently the only way to remove it is to make the object shadowless, which isn’t a good solution except in very special cases.

This algorithm could remove the artifact: If the actual normal vector of the object points away from the light source (its dot-product with the light vector is negative) but the perturbed normal points towards it (dot-product positive), then ignore the first shadow-test intersection with the object itself.

There are alternative ways of implementing an equivalent functionality:

- Don’t check the condition (if it’s too difficult to check due to how the code is designed) but always ignore the first intersection with the objects itself. This will work properly with closed surfaces but not with open ones, so it might need to be a feature for the user to turn on with a keyword (similar to eg. ‘double_illuminate’).

- Alternatively, don’t ignore the first intersection, but instead ignore the “opposite side” of the object’s surface (again, possibly only if a keyword has been specified). In other words, if we are rendering the outer side of the object, ignore its inner side when shadow-testing, and vice-versa.

- Perhaps simply add a feature to make surfaces one-sided (similarly to how they can be made so in OpenGL and similar scanline rendering systems). In other words, the inner side of a surface is completely ignored everywhere, making the object virtually invisible from the inside. The advantage of this feature would be that it can have uses other than simply removing the shadow line artifact.

256Texture/Material/FinishFeature Request3.70 RC6Very LowLowCSG texturing modesTracked on GitHub
0%
Task Description

At times, the current method of specifying texture for
CSG components and compounds is restricting. The issue
pops up now and then, see e.g.

http://news.povray.org/povray.pov4.discussion.general/thread/%3Cweb.4799def8e1857b77c150d4c10%40news.povray.org%3E/

http://news.povray.org/povray.general/thread/%3Cweb.4fc892634f065c00e32b83540@news.povray.org%3E/

http://news.povray.org/povray.general/thread/%3Cweb.5073e9f7dae1fbb2d97ee2b90%40news.povray.org%3E/

There should be a new CSG option “texture_mode” or similar, which could take
one of the following values:

preserve (the current behavior)
cutaway (the current behavior when specifying cutaway_textures)
override (replace all individual textures with compound texture)
layer (layer the compound texture over the existing textures)

and possibly, more involved

modify/merge: if both element and compund textures are simple, i.e.
not layered or mapped, override all default values of the element
textures with the values from the compound texture. The idea would
be to, e.g., have the elements already pigmented but then apply
common normal or finish properties.

263Parser/SDLFeature Request3.70 RC6Very LowLowFunctions and patterns for finish variationsTracked on GitHub
0%
Task Description

the pigment {} and normals {} sections allow spatial variation of color, transparency and normal map. On the other hand, the specular parameter is a fixed scalar. This removes many possibilities. For instance, specularity could vary in space (speckles of oil or water on a surface, worn-out finish, having specularity reduce where the pigment transparency increases) and have color components. With current settings, the light’s color is simply multiplied by the scalar specified by “specular”, whereas multiplying each component with different color could create diverse effects (the “metallic” keyword already acts similar to duplicating the specular color from the pigment). The syntax could be exactly the same as for the pigment (all the patterns, color maps, image maps and functions would apply, allowing reuse of most of the code).

The effect can now be partially faked by having patterned textures, but it requires a very complex code and the lack of layering of patterned textures makes it difficult to vary the specularity and pigment separately.

In a similar way, roughness and brilliance could also vary in space.

Doing the same for varying reflectivity would be more difficult, as it has angular dependence and possibilty of Fresnel calculation, but it could at least be a full color instead of a simple scalar multiplier. For instance, having a blue surface that reflects only red component of the light should not be impossible.

I think at least part of this functionality actually makes the scene description language more uniform and self-consistent.

278BackendFeature Request3.70 RC7Very LowMediumImplement Lens Flare RenderingTracked on GitHub
0%
Task Description

Currently POV-Ray does not support rendering lens flare effects, however, they can be simulated using a macro (include file) by Chris Colefax.

I would like to suggest adding a feature to POV-Ray to support lens effects “natively” since

  • as far as I know the macro has been designed for POV-Ray 3.1 so with each new POV-Ray version it gets more likely that this macro does not work properly any more
  • the macro does not work when rendering with radiosity, probably because the macro creates the lens effect by using a pigment with a high ambient value (which is ignored by POV-Ray 3.7’s radiosity algorithm).

Additionally, the macro is not quite easy to employ because

  • it needs to know the exact camera parameters (location etc.) and defines an own camera itself so any important camera information has to be stored if the effect has to work as expected
  • it does not (actually cannot) take into account that objects may (partially) hide the lens effect
  • reflections and refractions (of light sources) cannot be combined with it properly - the user would have to calculate both the point where the reflected/refracted light source can be observed and the shape it then has due to distortion, and in more complex scenes such computations are nearly impossible in SDL.

I would suggest integrating such a lens flare rendering feature with the “looks like” mechanism you already have for light sources. Several parameters that can currently be set for the macro - including effect brightness and intensity, lens options and whether to create a flare at all - could be set for the light source.

Then POV-Ray could store the location and colour of each ray that finally intersected the “looks like” object of a light source and, having finished the main rendering, from that data compute a partially transparent “lens flare layer” eventually mixed into the rendered image. By this, the above mentioned problems could be avoided:

  • an object fully or partially intersecting a light source’s “looks like” object would also reduce the number of pixels used to create a flare - and therefore reduce that flare until fully hiding it
  • the same goes for reflected and/or refracted versions of the “looks like” object
  • the camera’s location and other properties would be used automatically
  • and finally, as a feature supported by POV-Ray itself, there would be neither compatibility issues nor problems like the effect not fitting together with radiosity.

Do not get me wrong, I would not expect POV-Ray to really calculate intersections that naturally happen in a camera lens, causing lens flares. Effects looking appropriate can actually be created just in 2D space (as some graphics programs do support) so the work to be done would, as far as I have any overview, be:

  • storing, as mentioned above, the relevant data for pixels showing “looks like” objects
  • calculating a lens flare from that data after the render has finished
  • overlaying the rendered image with the newly created lens effect.
299Parser/SDLFeature Request3.70 RC7Very LowLowObject Properties FeatureTracked on GitHub
0%
Task Description

Up to POV-Ray 3.7 RC7 it has not been possible so far to declare custom properties for POV-Ray’s objects, which would be especially useful for complex objects defined in include files.

Currently, if you want to have an object (e.g. a car) with certain variable parameters (e.g. colour, wheel rotation, ...) defined in an include file and the parameters set by a scene file which uses the include file, you have to choose one of the following approaches:

1. use a macro

#macro car(colour, wheelrot, ...)
  ...
#end

or, 2. check parameters declared before, e.g.

#declare car =
union {
  
  #ifdef (colour)
    #local colour_internal = colour;
  #else
    #local colour_internal = default_colour;
  #end
  
}

The resulting object would be used in the following way:

  #include "car.inc" // include file once
  object {
    car(rgb <1,0,0>, 0, ...) // macro approach
  }
  // other approach
  #declare colour = rgb <1,0,0>;
  #declare wheelrot = 0;
  ...
  #include "car.inc" // include file every time you want to have a car object instance
  object {
    car
  }

Needless to say, both approaches are not quite optimal.

  • The macro approach needs only one #include directive and name conflicts will (hopefully) not be a problem. However, one would have to look up the parameter order of the macro in the include file, in the worst case every time the macro is used.
  • The other approach needs as many #include directives as car objects shall be instantiated, there can arise name conflicts with other inculde files used in the scene, and a (potentially long) list of parameters has to be declared before each #include. On the other hand, with this approach for any value it is clear which information it gives, e.g. #declare colour = rgb <1,0,0> can easily be read as ‘set car colour to “red”‘.

My suggestion would be creating an SDL feature to

  • declare which properties a certain object can have
  • set these properties inside the object statement in which the object is used.

One step up could be to even declare object classes along with them.

This could look like this:

// include file code
class car { // alternatively (without classes) use #declare car = object { ...
  property colour = rgb <1,0,0>; // with default colour
  
  union {
    ...
  }
}

// scene file code
car { // alternatively (without classes) use object { car ... }
  colour rgb <0,0,1>
}

Note that this solution makes the declarations much more concise and easy-to-read. Especially in scenes with many includes and animation scenes where objects’ properties have to be manipulated according to sometimes complex functions, this would be very useful. Please also consider that such user-defined objects can have dozens of properties.

300OtherFeature Request3.70 RC7DeferVery LowReference Documentation SupportTracked on GitHub
0%
Task Description

As emerged as an idea during the discussion of FS#299, an SDL / POV-Ray editor feature would be useful that allows API documentation via formal comments, e.g. in include files:

/**
 * Creates a car object.
 * @param a
 *        description of param a
 * ...
 */
#macro car(a,b,c)
  ...
#end

In addition to the ability of (auto-)generating a documentation file from such comments, an editor window feature would be convenient that allows popup display of a macro’s (object’s / parameter’s / ...) documentation section.

310EditorFeature Request3.70 RC7Very LowLowEditor should remember bookmarksTracked on GitHub
0%
Task Description

Now the editor remembers only the cursor positions of the loaded files when starting a new PR session. It would be more friendly to remember whether the window was split or not, as well as the bookmarks.

319Texture/Material/FinishFeature Request3.70 releaseVery LowLowAdd interior to #default directiveTracked on GitHub
0%
Task Description

When working with predefined materials, it would be useful to have something like:

#if (!Use_photons)
  #default { interior { caustics 1 } }
#end

#include "my_predefined_materials.inc"

Default medias or IORs could also be useful.

327Parser/SDLFeature Request3.70 releaseVery LowLowSupport for non-ASCII characters in filename stringsTracked on GitHub
0%
Task Description

pov 3.7 Can not identify the Chinese.I give the texture map filename in chinese,it turns out parse error.

333User interfaceFeature Request3.70 releaseVery LowLowMake text in "about" alt+b dialog selectable with the m...Tracked on GitHub
0%
Task Description

When you press alt+b or access the “about” dialog in the Help menu it displays some text including software version number and list of contributors.

It would be nice to be able to select and copy this text using this mouse. Sometimes in the newsgroup I have to tell people what version of POVray I am using, and typing the version number can be a pain.

334Texture/Material/FinishFeature Request3.70 releaseVery LowLowHLS colorsTracked on GitHub
0%
Task Description

It would be nice to be able to specify colors in HLS as well as RGB.

Currently, you can use a macor to convert individual colors. But this does not work in color_maps where you want smooth gradations/interpolations between two or several colors.

118Light sourceFeature Request3.70 beta 37aVery LowLowMore efficient handling of fading lightsTracked on GitHub
0%
3.71 release Task Description

Currently, fading light sources are used for lighting and shadow
calculations even when so far away as to no longer have any effect
on the outcome. The proposed solution is to add a new keyword
fade_cutoff_distance which tells povray to ignore the light
source when alluminating a point at larger distance.

A sample implementation is provided in the attached files. These
changes are still based on beta 34 as sources for the current beta
are not yet available, and starting to merge changes to beta 35
only at this time didn’t seem worth the effort. Also, please
disregard, changes in the CVS header comments (I also use
CVS locally for managing source files).

Further considerations regarding this feature:

- For special effects this feature can also be used if the light
source does not actually use fading. On the other hand, cutting
the light at some distances can be considered an extreme form
of fading which may justify the keyword name anyhow.

- Depending on how  FS#46  is implemented, the test for cutoff may
then be needed at another location as well.

- The default value currently is 0 (or *no* cutoff distance). For
#version 3.7 of higher, the default could be chosen automatically
based on the light source intensity and adc_bailout, although it
may then need to be overriden by the user for extreme pigments.

272OtherFeature Request3.70 RC6DeferVery LowMinor change, significant speedup in cubic polynomial s...Tracked on GitHub
0%
3.71 release Task Description

While familiarizing myself with the code, I found some small changes in the solve_cubic function that lead to a significant speedup.

In my experience, “pow” is by far the slowest function in math.h and replacing it with simpler functions usually makes a tremendous impact on the speed (it’s an order of magnitude slower than sqrt/exp/cbrt/log).

solve_cubic has a “pow” function that can be replaced by cbrt (cubic root), which is standard in ISO-C99 and should be available on all systems. Separate benchmarks of solve_cubic function show this change almost doubles the speed and does not lower the accuracy. As solve_cubic is part of the solution of quartic equation, this improves the speed for many primitives. Testing with a scene containing many torus intersection tests (attached below) I still observed almost 10% speedup (Intel, 4 threads, 2 hyperthreaded cores, antialiasing on, 600×600: from 91 to 84 seconds). And this is for a torus, where a lot of time is spent in the solve_quartic and cubic solver is only called once! Similar speedup should be expected for prism, ovus, sor and blob.

I do believe the cubic solver can be done without trigonometry, but that would mean changing the algorithm, introducing new bugs and requiring a lot of testing. However, the trigonometric evaluation can still be simplified (3% speedup in full torus benchmark).

These changes don’t affect the algorithm at all, they are mathematically identical to the existing code, so the changes can be applied immediately. I also included other changes just as suggestions. Every change is commented and marked with [SC 2.2013].

This sadly does not speedup the sturm solver, which uses bisection and regula-falsi and looks very optimized already.

The test scene I used has a lot of torus intersections from various directions (shadow rays, main rays, transmitted rays).

27OtherFeature Request3.70 beta 32Very LowLowAdd texture support to background statementTracked on GitHub
0%
Future release Task Description

Adding full texture statement support to the background statement (with a scale of 1/1) aligned with the image_map direction of an image would allow i.e. specifying an image as background easily.

28FrontendFeature Request3.70 beta 32Very LowLow#debug message not displayed.Tracked on GitHub
0%
Future release Task Description

The #debug message stream is only being flushed when it hits a newline character,
instead of after each #debug statement. This means that some final strings don’t show up.

#debug "This line prints,\n but this line doesn't."
44RadiosityFeature RequestAllVery LowLowImprove Normals Handling in RadiosityTracked on GitHub
0%
Future release Task Description

Currently, radiosity does not make use of the fact that pertubed normals would theoretically just require a different weighting of already-sampled rays, leading to the following issues:

  • Honoring normal pertubations in radiosity leads to an increased number of samples, slowing down sample cache lookup.
  • The increased number of samples is generated from a proportionally higher number of sample rays, slowing down pretrace even further.
  • Low-amplitude pertubations tend to be smoothed out; “reviving” these is only possible by increasing the general sample density.
  • Handling of multi-layered textures with different normal pertubations is currently poorly implemented.

As a solution, I propose to store for each radiosity sample not only the resulting illumination for a perfectly unpertubed normal, but from the same set of sample rays also compute the illumination for an additional set of about a dozen standardized pertubed-normal directions, and interpolate among these when computing the radiosity-based illumination for a particular point that has a pertubed normal.

For backwards compatibility, this method of dealing with pertubed normals in radiosity might be activated by a different value for the “normal” statement in the radiosity block, say, “normal 2”.

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