PoD wrote:
> 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.
> 
> 

It works great. Thanks a bunch!

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