On Sat, 02 Sep 2006 20:37:45 +0000, Abe Mishler wrote:

> Hello everyone,
> 
> I'm running a gentoo box with the following version of POV-Ray:
> 
> Persistence of Vision(tm) Ray Tracer Version 3.6.1
> (i686-pc-linux-gnu-g++ 3.4.6
>  @ i686-pc-linux-gnu)
> 
> I've created a nice pie-chart that I'd like to animate. Rendering a
> single frame is no problem -- the image looks acceptable. The problem
> appears when I insert the clock. Actually, the problem appears on the
> second frame and any subsequent frames in an animation.
> 
> I have some example images. For some reason frame 2 doesn't show up in
> firefox when I load it. Perhaps this is somehow related to the problem.
> It's as if the image is corrupt. I have zipped it and another viewer
> should display it (KView works great).
> 
> good------> http://www.pfcme.org/pov/pie-slice1.png
> speckled--> http://www.pfcme.org/pov/pie-slice2.png.zip
> 
> What follows is my pov source and ini files. Comments in the source are
> from code I've found other places describing a solution to the problem I
> thought I had. Before I list the code, thanks in advance for your
> interest in my problem.
> 
> /Abe
> 
> === INI
> 
> Antialias=On
> Jitter=Off
> 
> Width=320
> Height=240
> 
> Output_File_Type=N  #P[N]G format
> #Bits_Per_Color=16
> Palette=H  #[G]rayscale, [H]igh Color, [T]rue Color
> 
> Antialias_Threshold=0.9
> Antialias_Depth=6
> Sampling_Method=1
> Input_File_Name=pie-slice.pov
> 
> Initial_Frame=1
> Final_Frame=2#570
> Initial_Clock=0
> Final_Clock=3.14159
> 
> Cyclic_Animation=Off
> Pause_when_Done=Off
> 
> === POV
> 
> #include "shapes.inc"
> 
> // the camera: ----------
> camera {
>   angle    60
>   location <0, 5, -10>
>   right    x*image_width/image_height
>   look_at  <0, 0, 0>
>   rotate   <0, 0, -5>
> }
> //---------------------- end of camera
> 
> // now, some light
> light_source {
>   <-10,0,0>
>   color rgb <0.5,0.5,0.5>
> }
> 
> // now, some more light
> light_source {
>   <0,0,0>
>   color rgb <0.75,0.75,0.75>
> }
> 
> #declare BlurAmount = 0.1; // Amount of blurring
> #declare S = seed(0);
> 
> // the pie
> #declare pie_chart = union {
> cylinder {
>   <0,-.5,0>, <0, .5, 0>, 3
>   finish {
>     ambient 0.6
>     specular 1.5
>     reflection { 0.7 fresnel on }
>     ior 1.5
>   }
>   interior { refraction 0.5 }
> normal { bumps BlurAmount
> translate <rand(S),rand(S),rand(S)>*10
> // scale 100 provides blurry and non-grainy reflections
> // scale 0.001 provides grainy reflections
> scale 100
> }
> 
>   pigment { color rgbt <64/255,128/255,240/255,0.35> }
>   double_illuminate
> }
> 
> /*sphere {
>   <0, 1, 0>, 0.15
>   pigment { color rgb <1, 0, 0> }
> }*/
> 
> // the pie piece
> difference {
> cylinder {
>   <0,-.5,0>, <0, .6, 0>, 3.1
>   finish {
>     ambient 1.5
>     specular 1.5
>     reflection { 0.7 fresnel on }
>     ior 1.5
>   }
>   interior { refraction 0.5 }
> normal { bumps BlurAmount
> translate <rand(S),rand(S),rand(S)>*10
> // scale 100 provides blurry and non-grainy reflections
> // scale 0.001 provides grainy reflections
> scale 100
> }
> 
>   pigment { color rgbt <208/255,64/255,144/255, 0.45> }
>   double_illuminate
> }
> plane {
> <1, 0, 0>, 0
> rotate <0, -72, 0>
> }
> plane {
> <1, 0, 0>, 0
> rotate <0, 90, 0>
> }
> no_shadow
> rotate <0, -50, 0>
> }
> }
> 
> object {
>   pie_chart
>   rotate <-5*clock, -5*clock, -5*clock>
> }


I tried your files and got the same result except I could open the
pictures in firefox-1.5.0.5.
Oddly, the first render looked ok and the others were speckled even
without the rotate.

When I changed the planes to 

plane
{
   <1, 0, 0>, 0.01
   rotate <0, -72, 0>
}
plane
{
   <1, 0, 0>, 0.01
   rotate <0, 90, 0>
}

the problem went away.

Cheers,
   PoD.

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