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.
FS#60 - Artifacts using prism in CSG
Attached to Project:
POV-Ray
Opened by Christoph Lipka (clipka) - Friday, 18 September 2009, 15:13 GMT
Last edited by William F Pokorny (wfpokorny) - Saturday, 29 October 2016, 12:53 GMT
Opened by Christoph Lipka (clipka) - Friday, 18 September 2009, 15:13 GMT
Last edited by William F Pokorny (wfpokorny) - Saturday, 29 October 2016, 12:53 GMT
|
DetailsUsing 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. |
This task depends upon
I had hoped someone else might pick up this glove. But as it is a pretty old bug (I’d guess it has been around ever since), I see no need to rush it into the .0 release of 3.7 and risk breaking the prism inside() test for other special cases.
Now tracked on github as issue #139.