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Hello,
I have encountered a bug that causes random (but in a reproducable way)
render blocks to "see through" through a reflective isosurface, when
there is also a second isosurface in the scene. (A lot of preconditions)
This is definitely not connected to a wrong max_gradient. When I
commented out the code responsible for the isosurface caching, the
isosurface rendered correctly. It seems as if povray thinks there was a
cache hit, when there was actually none.
Test scene:
#include "colors.inc"
#include "functions.inc"
camera
{
location <-.02, .54,- .65>
look_at <-.07, 0 ,- .16>
}
#declare f_decocube=function(x,y,z,a,b){
(pow(x*x+y*y-a*a,2)+pow(z*z-1,2))
*(pow(y*y+z*z-a*a,2)+pow(x*x-1,2))
*(pow(z*z+x*x-a*a,2)+pow(y*y-1,2))
-b
}
isosurface
{
function { f_decocube(x,y,z,0.95,0.011) }
evaluate 194 * .25, 1.3, .8
contained_by{sphere {0,1.5}}
accuracy 0.001
pigment { Blue }
translate y*1.06
scale .05
translate <-.8, 0, .28>
}
isosurface
{
function { f_sphere(x, y, z, 1) }
contained_by { sphere { 0, 1.0001 } }
max_gradient 1.322
accuracy 0.004
pigment { Red }
finish { reflection 0.5 }
scale .04
rotate <-5, 0, 15>
translate <-.4, .04, -.2>
}
light_source
{
<-200, 103, 95> * 10000
color <1, .95, .75> * 2.4
}
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The lines in my previous post are wrong. I don't know the correct line
anymore, so I just post the context:
isosurface.cpp
"
/* change the sign and go into the isosurface */
}
}
//remove this line:
//Thread->isosurfaceData->current = this;
Thread->isosurfaceData->ctx = Thread->functionContext;
for (; itrace < max_trace; itrace++)
{
"
and later on:
"
else if(!in_shadow_test)
{
itd.cache = true;
VEvaluateRay(itd.Pglobal, PP, EP1.t, DD);
VEvaluateRay(itd.Dglobal, PP, EP2.t, DD);
//add this line:
itd.current = this;
return false;
}
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Lukas Winter wrote:
> The lines in my previous post are wrong. I don't know the correct line
> anymore, so I just post the context:
>
> isosurface.cpp
> "
> /* change the sign and go into the isosurface */
> }
> }
>
> //remove this line:
> //Thread->isosurfaceData->current = this;
> Thread->isosurfaceData->ctx = Thread->functionContext;
>
> for (; itrace < max_trace; itrace++)
> {
> "
> and later on:
> "
> else if(!in_shadow_test)
> {
> itd.cache = true;
> VEvaluateRay(itd.Pglobal, PP, EP1.t, DD);
> VEvaluateRay(itd.Dglobal, PP, EP2.t, DD);
> //add this line:
> itd.current = this;
>
> return false;
> }
Thanks for this (and good work in finding it!)
I've not looked at it closely but provided it has no unexpected side-
effects we'll apply the fix to the source.
regards,
-- Chris
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