POV-Ray Bug Tracking System:

FS#320: Failed Assertion in image/image.cpp

Christian Friedl — Sat, 08 Mar 2014 15:06:06 +0000

Hi,

when I'm trying to render a scene on my MacBook Air with the following .ini-settings, I get a failed assertion and the program halts.

Here are the .ini-Settings:

Width=640
Height=480

Test_Abort=Off
Continue_Trace=On
Pause_When_Done=Off
Verbose=On
Draw_Vistas=Off
Sampling_Method=1
Quality=9
Jitter=Off
Display=Off
Buffer_Output=Off
Debug_File=false

Final_Frame=10

This is the failed assertion:

Assertion failed: (((x) < width) && ((y) < height)), function SetRGBFTValue, file image/image.cpp, l

Oddly, if I change width and height to something very small like 320x200, it works.

This is the complete stack trace:

Process: povray [11188]
Path: /opt/local/bin/povray
Identifier: povray
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: bash [11184]

Date/Time: 2014-03-07 14:44:04.423 +0100
OS Version: Mac OS X 10.7.5 (11G63)
Report Version: 9

Interval Since Last Report: 708124 sec
Crashes Since Last Report: 23
Per-App Crashes Since Last Report: 21
Anonymous UUID: FB98BF62-1511-4E59-94F3-E89C04491CA5

Crashed Thread: 3

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
objc[11188]: garbage collection is OFF
Assertion failed: (((x) < width) && ((y) < height)), function SetRGBFTValue, file image/image.cpp, line 1827.

Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff96134bca __psynch_cvwait + 10
1 libsystem_c.dylib 0x00007fff90454274 _pthread_cond_wait + 840
2 povray 0x000000010eba589d bool boost::condition_variable_any::do_wait_until(boost::unique_lock&, timespec const&) + 77
3 povray 0x000000010eba0846 vfe::vfeSession::GetStatus(bool, int) + 198
4 povray 0x000000010ebc0147 SDL_main + 3511
5 povray 0x000000010ed4d621 -[SDLMain applicationDidFinishLaunching:] + 49
6 com.apple.Foundation 0x00007fff8bc3ad0e __-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_1 + 47
7 com.apple.CoreFoundation 0x00007fff8fcda7ba _CFXNotificationPost + 2634
8 com.apple.Foundation 0x00007fff8bc26fc3 -[NSNotificationCenter postNotificationName:object:userInfo:] + 65
9 com.apple.AppKit 0x00007fff8ef08e2b -[NSApplication _postDidFinishNotification] + 212
10 com.apple.AppKit 0x00007fff8ef08b91 -[NSApplication _sendFinishLaunchingNotification] + 78
11 com.apple.AppKit 0x00007fff8ef07858 -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 242
12 com.apple.AppKit 0x00007fff8ef075b9 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 330
13 com.apple.CoreFoundation 0x00007fff8fd24541 -[NSObject performSelector:withObject:withObject:] + 65
14 com.apple.Foundation 0x00007fff8bc5d7c7 __-[NSAppleEventManager setEventHandler:andSelector:forEventClass:andEventID:]_block_invoke_1 + 101
15 com.apple.Foundation 0x00007fff8bc5c74e -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 283
16 com.apple.Foundation 0x00007fff8bc5c5dc _NSAppleEventManagerGenericHandler + 105
17 com.apple.AE 0x00007fff91d02c25 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 200
18 com.apple.AE 0x00007fff91d02b03 _ZL25dispatchEventAndSendReplyPK6AEDescPS_ + 38
19 com.apple.AE 0x00007fff91d029f7 aeProcessAppleEvent + 250
20 com.apple.HIToolbox 0x00007fff8a57bb69 AEProcessAppleEvent + 102
21 com.apple.AppKit 0x00007fff8ef049c5 _DPSNextEvent + 1247
22 com.apple.AppKit 0x00007fff8ef0407d -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
23 com.apple.AppKit 0x00007fff8ef009b9 -[NSApplication run] + 470
24 povray 0x000000010ed4dc40 main + 1280
25 povray 0x000000010eb78744 start + 52

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x00007fff961357e6 kevent + 10
1 libdispatch.dylib 0x00007fff8c8d6786 _dispatch_mgr_invoke + 923
2 libdispatch.dylib 0x00007fff8c8d5316 _dispatch_mgr_thread + 54

Thread 2:
0 libsystem_kernel.dylib 0x00007fff96135036 __sigwait + 10
1 libsystem_c.dylib 0x00007fff90406aab sigwait + 68
2 povray 0x000000010ebbe222 SignalHandler() + 66
3 libboost_thread-mt.dylib 0x000000010f3a0814 thread_proxy + 132
4 libsystem_c.dylib 0x00007fff904508bf _pthread_start + 335
5 libsystem_c.dylib 0x00007fff90453b75 thread_start + 13

Thread 3 Crashed:
0 libsystem_kernel.dylib 0x00007fff96134ce2 __pthread_kill + 10
1 libsystem_c.dylib 0x00007fff904527d2 pthread_kill + 95
2 libsystem_c.dylib 0x00007fff90443a7a abort + 143
3 libsystem_c.dylib 0x00007fff904765de __assert_rtn + 146
4 povray 0x000000010ed2232b pov_base::RGBFTImage::SetRGBFTValue(unsigned int, unsigned int, float, float, float, float, float) + 171
5 povray 0x000000010ecf4d51 pov_frontend::ImageMessageHandler::DrawPixelBlockSet(pov_frontend::SceneData const&, pov_frontend::ViewData const&, POVMS_Object&) + 2529
6 povray 0x000000010eb98d46 pov_frontend::RenderFrontend::HandleImageMessage(pov_frontend::RenderFrontendBase::Id, unsigned int, POVMS_Object&) + 310
7 povray 0x000000010ece78a1 pov_frontend::RenderFrontendBase::ContinueBackup(POVMS_Object&, pov_frontend::ViewData&, pov_frontend::RenderFrontendBase::Id, int&, std::vector&, pov_base::Path const&) + 1265
8 povray 0x000000010eb92f01 pov_frontend::RenderFrontend::StartRender(pov_frontend::RenderFrontendBase::Id, POVMS_Object&) + 865
9 povray 0x000000010eb8f4a9 vfe::VirtualFrontEnd::Process() + 5129
10 povray 0x000000010eb9f46e vfe::vfeSession::ProcessFrontend() + 30
11 povray 0x000000010eb9fb8f vfe::vfeSession::WorkerThread() + 1279
12 libboost_thread-mt.dylib 0x000000010f3a0814 thread_proxy + 132
13 libsystem_c.dylib 0x00007fff904508bf _pthread_start + 335
14 libsystem_c.dylib 0x00007fff90453b75 thread_start + 13

Thread 4:
0 libsystem_kernel.dylib 0x00007fff96134bca __psynch_cvwait + 10
1 libsystem_c.dylib 0x00007fff90454274 _pthread_cond_wait + 840
2 povray 0x000000010eba589d bool boost::condition_variable_any::do_wait_until(boost::unique_lock&, timespec const&) + 77
3 povray 0x000000010eb87d26 vfe::SysQNode::Receive(int*, bool) + 214
4 povray 0x000000010ecf6e39 POVMS_ProcessMessages(void*, bool, bool) + 201
5 povray 0x000000010ebc34f3 (anonymous namespace)::MainThreadFunction(boost::function0 const&) + 259
6 libboost_thread-mt.dylib 0x000000010f3a0814 thread_proxy + 132
7 libsystem_c.dylib 0x00007fff904508bf _pthread_start + 335
8 libsystem_c.dylib 0x00007fff90453b75 thread_start + 13

Thread 5:
0 libsystem_kernel.dylib 0x00007fff96134bca __psynch_cvwait + 10
1 libsystem_c.dylib 0x00007fff90454274 _pthread_cond_wait + 840
2 povray 0x000000010ebd60f4 void boost::condition_variable_any::wait(boost::unique_lock&) + 68
3 povray 0x000000010ebd5ffd pov::TaskQueue::Process() + 1421
4 povray 0x000000010ec03088 pov::Scene::ParserControlThread() + 40
5 libboost_thread-mt.dylib 0x000000010f3a0814 thread_proxy + 132
6 libsystem_c.dylib 0x00007fff904508bf _pthread_start + 335
7 libsystem_c.dylib 0x00007fff90453b75 thread_start + 13

Thread 3 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000006 rcx: 0x0000000112d74408 rdx: 0x0000000000000000
rdi: 0x0000000000006f03 rsi: 0x0000000000000006 rbp: 0x0000000112d74430 rsp: 0x0000000112d74408
r8: 0x00007fff7a13afb8 r9: 0x0000000000000723 r10: 0x00007fff96134d0a r11: 0xffffff80002dad60
r12: 0x000000010ed9fd23 r13: 0x000000010f3cb000 r14: 0x0000000112d75000 r15: 0x000000010ed9faf5
rip: 0x00007fff96134ce2 rfl: 0x0000000000000246 cr2: 0x000000010f3cb000
Logical CPU: 0

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0x7fff9287f000 - 0x7fff928d7ff7 libTIFF.dylib (??? - ???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
0x7fff928d8000 - 0x7fff92933ff7 com.apple.opencl (2.0.19 - 2.0.19) /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL
0x7fff92934000 - 0x7fff9296efe7 com.apple.DebugSymbols (2.1 - 87) /System/Library/PrivateFrameworks/DebugSymbols.framework/Versions/A/DebugSymbols
0x7fff9296f000 - 0x7fff929e5ff7 libc++.1.dylib (28.4.0 - compatibility 1.0.0) /usr/lib/libc++.1.dylib
0x7fff92a0f000 - 0x7fff92a1cfff libCSync.A.dylib (600.0.0 - compatibility 64.0.0) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
0x7fff92a1d000 - 0x7fff92a71ff7 com.apple.ScalableUserInterface (1.0 - 1) /System/Library/Frameworks/QuartzCore.framework/Versions/A/Frameworks/ScalableUserInterface.framework/Versions/A/ScalableUserInterface
0x7fff92d9a000 - 0x7fff92d9bff7 libremovefile.dylib (21.1.0 - compatibility 1.0.0) /usr/lib/system/libremovefile.dylib
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0x7fff9338e000 - 0x7fff93602fff com.apple.CoreImage (7.99.1 - 1.0.1) /System/Library/Frameworks/QuartzCore.framework/Versions/A/Frameworks/CoreImage.framework/Versions/A/CoreImage
0x7fff93603000 - 0x7fff9360cff7 libsystem_notify.dylib (80.1.0 - compatibility 1.0.0) /usr/lib/system/libsystem_notify.dylib
0x7fff9360d000 - 0x7fff93624fff com.apple.MultitouchSupport.framework (231.4 - 231.4) /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
0x7fff9369b000 - 0x7fff9369bfff com.apple.CoreServices (53 - 53) /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
0x7fff936c8000 - 0x7fff936cbfff libRadiance.dylib (??? - ???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib
0x7fff936d9000 - 0x7fff93719ff7 libcups.2.dylib (2.9.0 - compatibility 2.0.0) /usr/lib/libcups.2.dylib
0x7fff93761000 - 0x7fff937adff7 com.apple.SystemConfiguration (1.11.3 - 1.11) /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
0x7fff937ae000 - 0x7fff937b4ff7 libunwind.dylib (30.0.0 - compatibility 1.0.0) /usr/lib/system/libunwind.dylib
0x7fff937b5000 - 0x7fff93811ff7 com.apple.HIServices (1.21 - ???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
0x7fff93812000 - 0x7fff93818fff libmacho.dylib (800.0.0 - compatibility 1.0.0) /usr/lib/system/libmacho.dylib
0x7fff93819000 - 0x7fff9384cff7 com.apple.GSS (2.2 - 2.0) /System/Library/Frameworks/GSS.framework/Versions/A/GSS
0x7fff9384d000 - 0x7fff93857ff7 liblaunch.dylib (392.39.0 - compatibility 1.0.0) /usr/lib/system/liblaunch.dylib
0x7fff93858000 - 0x7fff93865ff7 libbz2.1.0.dylib (1.0.5 - compatibility 1.0.0) /usr/lib/libbz2.1.0.dylib
0x7fff93885000 - 0x7fff939bbfff com.apple.vImage (5.1 - 5.1) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
0x7fff939bc000 - 0x7fff939e7ff7 libxslt.1.dylib (3.24.0 - compatibility 3.0.0) /usr/lib/libxslt.1.dylib
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0x7fff93d63000 - 0x7fff93e65fff libxml2.2.dylib (10.3.0 - compatibility 10.0.0) /usr/lib/libxml2.2.dylib
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0x7fff949cd000 - 0x7fff94e94fff FaceCoreLight (1.4.7 - compatibility 1.0.0) /System/Library/PrivateFrameworks/FaceCoreLight.framework/Versions/A/FaceCoreLight
0x7fff954e6000 - 0x7fff954edfff com.apple.NetFS (4.0 - 4.0) /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
0x7fff955cf000 - 0x7fff955d3fff libCGXType.A.dylib (600.0.0 - compatibility 64.0.0) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
0x7fff95648000 - 0x7fff956cbfef com.apple.Metadata (10.7.0 - 627.37) /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Metadata
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0x7fff95743000 - 0x7fff95745fff com.apple.TrustEvaluationAgent (2.0 - 1) /System/Library/PrivateFrameworks/TrustEvaluationAgent.framework/Versions/A/TrustEvaluationAgent
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External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 2
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 29684
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=152.0M resident=86.4M(57%) swapped_out_or_unallocated=65.6M(43%)
Writable regions: Total=129.5M written=26.5M(20%) resident=28.4M(22%) swapped_out=4K(0%) unallocated=101.0M(78%)

REGION TYPE VIRTUAL
=========== =======
CG backing stores 164K
CG shared images 3416K
CoreGraphics 16K
CoreServices 2588K
MALLOC 45.0M
MALLOC guard page 48K
Memory tag=242 12K
STACK GUARD 24K
Stack 66.5M
VM_ALLOCATE 16.1M
__CI_BITMAP 80K
__DATA 13.0M
__IMAGE 528K
__LINKEDIT 51.1M
__TEXT 100.9M
__UNICODE 544K
mapped file 32.3M
shared memory 308K
=========== =======
TOTAL 332.6M

Model: MacBookAir3,1, BootROM MBA31.0061.B07, 2 processors, Intel Core 2 Duo, 1.4 GHz, 4 GB, SMC 1.67f10
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
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AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD1), Broadcom BCM43xx 1.0 (5.106.198.19.22)
Bluetooth: Version 4.0.8f17, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en0
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USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821b, 0x04530000 / 5
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FS#297: Have a user-definable epsilon

Richard Callwood III — Sun, 09 Jun 2013 17:10:18 +0000

There are times when scaling an entire scene up or down is difficult or just not feasible.

One suggestion is a global_settings option.

Also, I've noticed that in some situations, such as interactions between certain transparent objects, the epsilon seems to kick in quite early. Perhaps there could be situational or contextual epsilons, such as the "tolerance" of sphere_sweep or the "accuracy" of isosurface.

FS#268: "naked" pigment statement does not properly override previous pigment

Christoph Lipka — Sun, 27 Jan 2013 08:47:52 +0000

A pigment statement not wrapped in a texture statement does not properly override a pigment previously defined for the object. In the following SDL code:

#declare PLANE = plane { y,0
texture {
pigment { checker color rgb 1 color rgb 0 scale 0.1 }
} }
object { PLANE
pigment { checker color red 1 color blue 1 scale 1.0 }
}

the scaling of the pigment previously specified for the PLANE object is retained for the new pigment. Compare:

#declare PLANE = plane { y,0
texture {
pigment { checker color rgb 1 color rgb 0 scale 0.1 }
} }
object { PLANE
texture {
pigment { checker color red 1 color blue 1 scale 1.0 }
} }

which behaves as expected.

The issue has been around at least since POV-Ray 3.6.2.

FS#190: photon message reporting

Jim Holsenback — Sat, 08 Jan 2011 17:15:43 +0000

couple of observations:

if no photons are gathered (hey it happens ... my typo) when attempting to save a photon map the warning message just indicates that it couldn't save the map, maybe the message could be enhanced to say something like: No photons were gathered so no map information was saved. At first I thought something had changed in my I/O restrictions (I'm writing to an image directory not current or work directory)

when reading a previously saved photon map there is no indication that it was read in other than the end stats showing a small amount of photon time. I don't recall but didn't v3.6 indicate that the a previously saved map was being used? Just for the heck of it I moved the map file aside and it did prove to me that it was indeed being input. Some sort of message at the time the file is read in might be helpful.

FS#150: Windows file association problems (Win7 only??)

Mike H — Fri, 25 Jun 2010 13:52:47 +0000

Windows allows you to associate programs with file extensions using the "Open with" file manager right-click menu extension.

I'm running Windows 7 64bit, and installed the 64 bit versions of 3.6.2 and the beta appropriately.

A couple of problems that I haven't tested very thoroughly:

1. If you have both POV 3.6.2 and the beta installed at the same time, you can no longer using this dialog change the association to the beta once it has been created for 3.6.2. There's no error or anything; it just opens the file inside 3.6.2 instead. Maybe because both versions appear as "POV-Ray for Windows" to this dialog? Would adding the version number to the name fix things? Anything I can do on my end of things to resolve this?

2. In POV-Ray 3.6.2, I can use this dialog to open *.inc, *.txt and other files in POV-Ray, but only if POV-Ray isn't already running. If POV-Ray is already running I get an "Only /EDIT and /RENDER may be passed to previous instance" error. Files with the *.pov extension open properly regardless, without any error. I am unable to test this in the beta at the moment due to the first problem unfortunately. Could someone please test this with the beta and confirm whether the behavior also exists?

3. With the POV-Ray 3.7 beta, entering the following command in the command prompt results in the same error:

"C:\Program Files\POV-Ray for Windows v3.7\bin\pvengine64.exe" "D:\Working\Povray\GearHead\LoadingScreen\btr_maanji.pov"

If I change it to the following it works however:

"C:\Program Files\POV-Ray for Windows v3.7\bin\pvengine64.exe" /EDIT "D:\Working\Povray\GearHead\LoadingScreen\btr_maanji.pov"

Is this error/behavior really necessary? Would it be OK to instead change the behavior when the /EDIT flag is omitted in the
command-line such that the file is opened in the editor by default, without throwing an error?

FS#260: Patch to let POV-Ray builds with boost >=1.50

Casper Ti. Vector — Sat, 10 Nov 2012 02:54:05 +0000

Originally resolved in [[https://bugs.gentoo.org/show_bug.cgi?id=425450]].
Attached is a patch with Gentoo-specific code removed.

There are two parts in this issue:
* The newer boost library requires downstream users to explicitly link to the boost system library (-lboost_system).
* The newer boost library replaced TIME_UTC with TIME_UTC_, because glibc added TIME_UTC.

FS#331: Intersection causes quadric to disappear

Richard Callwood III — Mon, 27 Jul 2015 22:50:56 +0000

The following paraboloid renders correctly:

intersection
{ quadric { , , , -1 }
cylinder { 0, y, 1 }
}

However, when I extend the clipping cylinder downward:

intersection
{ quadric { , , , -1 }
cylinder { -y, y, 1 }
}

the object disappears completely in POV-Ray 3.7 and 3.7.1. In POV-Ray
3.6.1, it renders as expected.

POV-Ray 3.7.0.unofficial (self-compiled with g++ 4.8, but completely unaltered)
POV-Ray 3.7.1-alpha.8150025.unofficial
openSUSE 13.2 GNU/Linux

This scene file illustrates the problem:

// +w480 +h240
#version 3.6; //[sic]

global_settings { assumed_gamma 1 }

camera
{ location
look_at
right 2 * x
up y
angle 43.1038
}

#default { finish { diffuse 0.6 ambient rgb 0.15618 } }

light_source
{ ,
rgb 6856.3
fade_power 2 fade_distance 0.10417
spotlight point_at radius 45 falloff 90
}

box
{ -,
pigment { rgb 1 }
}

plane
{ y, 0
pigment { checker rgb 0.05 rgb 1 }
}

intersection
{ quadric { , , , -1 }
cylinder { 0, y, 1 }
pigment { green 0.5 }
translate
}

intersection
{ quadric { , , , -1 }
cylinder { -y, y, 1 }
pigment { green 0.5 }
translate
}

On the right side, there should have been a cylinder capped with a paraboloid. A [[http://news.povray.org/povray.bugreports/thread/%3C55b39c37%241%40news.povray.org%3E/|thread has been started in povray.bugreports]]. Jerome has started to look at it.

FS#307: netpbm, ppm, read bug where first data byte CR char

William F Pokorny — Sat, 07 Sep 2013 13:00:54 +0000

I've recently been working with the netpbm ppm format and I have hit what I believe to be a bug in the way ppm files are read – very likely a bug in all netpbm formats. I am aware of the long standing povray issue with the netpbm file formats header where the height and width need to be on the same line as the magic number though that is not a requirement of the official format. This bug is different.

Namely in working with a larger number of ppm files I hit cases where a few would fail with the message : “Possible Parse Error: Unexpected EOF in PPM file” though the ppm files are fine. What is happening is that the first byte of data after the line feed (LF) (Ubuntu linux 12.04) happens to have a carriage return (CR) value.

The code which is set up to interpret the netpbm headers is reading a lines with “file->getline (line, 1024);” and this line reading code is pulling in the first byte of data with the CR value as part of the line. When the read by binary data, 8 or 16 bits at a time, starts, the povray read code is offset into the data by one byte too many.

The result from 10,000 meters, if input values were completely random file to file, would be netpbm read fails for size that make no sense in 1/256 files. In practice & depending on data some might never see fails while an unfortunate few might almost always fail.

I'd make some argument any CR following a LF character should not be pulled in as part of the line read even on windows/dos systems where CRLF is the usual line termination order. I think though the real fix is better netpbm header reading code which more strictly breaks apart the header on the first whitespace character doing the last depth break, aware of the file size, so it can decide what portion of any valid sequence of whitespce characters after the decimal depth value is data and not whitespace.

The attached tarball when unpacked has both a passing and failing case. To run “povray fails.pov” or “povray works.pov”. The only difference between the two ppm files if the fails.ppm data is all 0x0D while works.ppm data bytes are all 0x0C. The image rendered is meaningless.

Thanks for your time.
Bill P.

FS#298: the warning for isosurface does not appears as often as with 3.6.1

Grimbert Jérôme — Mon, 24 Jun 2013 09:37:48 +0000

From synthetic post of Cousin Ricky in p.beta-test, 2013-06-24 circa 3:19 pm (MST)

William F Pokorny wrote:
> It seems to be the case the gradient warnings are only generated if the
> isosurface is naked. If it is wrapped in an object as was the case with
> my thread safety example, we get no warnings.

Confirmed. If only I still had the concentration required to investigate
computer code.

#version 3.7;

#ifndef (MG) #declare MG = 40/9; #end
#ifndef (Naked) #declare Naked = no; #end

global_settings
{ assumed_gamma 1
radiosity {} //force isosurface calculations from all directions
}

light_source { , rgb 1 }

camera
{ location
look_at
angle 10.7447
}

#include "functions.inc"

#if (Naked)
isosurface
{ function { f_sphere (x, 0, z, (2660 - 40*y) / 9) }
contained_by { box { , } }
max_gradient MG
pigment { rgb }
scale 1/128
rotate -35 * x
translate y
}
#else
#declare Test = isosurface
{ function { f_sphere (x, 0, z, (2660 - 40*y) / 9) }
contained_by { box { , } }
max_gradient MG
pigment { rgb }
scale 1/128
rotate -35 * x
translate y
}
object { Test }
#end

On the command line, try:

declare=MG=1 declare=Naked=1

and

declare=MG=1 declare=Naked=0

To lose the warning, I had to declare the isosurface. Just wrapping the naked
isosurface in an object{} generated a warning.

=====Further analysis=====
isCopy seems to be intended to avoid displaying the same warning over
and over for the same isosurface (as duplicated isosurface indeed are
not copied but reference the same sub-structure).

#declare Ob = isosurface{...}; // that's not a copy
object {Ob ... } // that's a copy

Previously (3.6.1) the warning was displayed at the destruction of the
isosurface (when the sub-structure was actually referenced by no one else)

if((Stage == STAGE_SHUTDOWN) && (mginfo->refcnt == 0))

In 3.7, isCopy was introduced with change 4707, 16th February 2009,
along with the change introducing means for objects to submit message on
shutdown.
It was reported in windows source with change 4714, 21th February 2009.

If the symptom "isosurface embbeded in object (CSG) does not show the
warning" is correct, it might be a "feature/bug". The parser copied the
isosurface object and deleted the original before the render started.
When the render ends, it find only copies and because the refcnt is not
used anymore (for that purpose), it miss the last remaining true data to
display.

Instead of isCopy, what about adding in mginfo a boolean
"printed_warning" (actual name should be more appropriate), set to false
on creation, and turn to true on the first call (instead of last for
3.6.1) of the warning displaying function (test for false, set to true
if false) ? (and dropping isCopy in the process)

For instance, i'm afraid the following sequence would fails with current
code:

#declare Foo = isosurface{ ... };
#declare Bar = object { Foo ... };
#undef Foo;

(or any pop of #local context, such as building the isosurface via macro
or loop, or replacing the value of a previous #declare/#local )

FS#259: Stack Overflow with the write-directive with missing closing bracket

Michael Friedrichs — Thu, 01 Nov 2012 18:40:16 +0000

As I posted yesterday to the POV bugreports, I observed a bug with the #write directive, having forgotten the closing bracket. I looked a little bit closer and found different behaviours of POV with different array sizes.

With ArrayDim=100 (please look at the attached SDL-code, which is reduced as much as possible and produces only the bug and no scene) one get the Parse Error: "Expected 'string', End of File found instead" and the last line is highlighted. With ArrayDim=1024 you get an Stack Overflow and POV crashes.

I observed this at two different core i7 windows machines. On one of them (16 GB RAM, if this is of importance) the threshold between both behaviours was between 300 and 400. Hope this helps.

Best regards,
Michael