I have been trying to use the "Subset_Start_Frame" and 
"Subset_End_Frame" commands in a .ini file to subdivide my animations 
such that I can render portions of them on different computers.  During 
this process I have identified a potential bug in the implementation of 
this command.

What happens is when I use the "Subset_End_Frame" in my .ini file the 
value for "Subset_End_Frame", not the value for "Final_Frame", gets 
reported when I use the built in variable "final_frame" within the .pov 
file.  This does not seem to be how the command should be set up, and 
conflicts with the documentation.

I've included some sample code below - if you remove the 
"Subset_Start_Frame" and "Subset_End_Frame" from the .ini file the 
animation will produce 2 frames with red balls, 2 frames with green 
balls, 2 blue, 2 yellow and 2 purple.  If you add in the subset commands 
you should get 1 green, 2 blue and 2 yellow (i.e. frames 4-8).  Instead, 
you get 1 blue, 2 yellow and 2 purple (i.e. the animation gets 
recalculated, using frame 8 as the last frame, not frame 10).  This is 
confirmed by the error file which is generated.

I'm using PovRay 3.6, 32-bit.  WinXP, 512meg RAM, Pentium M @1.60GHz. 
I've also tried this using the same version of povray, WinXP, 256meg 
RAM, Celeron something-or-other with the same result.

Bryan

POV file:
light_source {
   <0,500,-500>
   color rgb <1,1,1>
   }

camera {
   location <0,0,-10>
   look_at <0,0,0>
   angle 30
   }

sphere {
   <0,0,0>, 1
   #if ((frame_number/final_frame) <=1)
     pigment { color rgb <1,0,1> }
   #end
   #if ((frame_number/final_frame) <= 0.8)
     pigment { color rgb <1,1,0> }
   #end
   #if ((frame_number/final_frame) <= 0.6)
     pigment { color rgb <0,0,1> }
   #end
   #if ((frame_number/final_frame) <= 0.4)
     pigment { color rgb <0,1,0> }
   #end
   #if ((frame_number/final_frame) <= 0.2)
     pigment { color rgb <1,0,0> }
   #end
   }

#debug concat("Final Frame  : ",str(final_frame,3,3),"\n")
#debug concat("Initial Frame: ",str(initial_frame,3,3),"\n")
#debug concat("Frame Number : ",str(frame_number,3,3),"\n")


Ini file:
Input_File_Name=ani.pov
Output_File_Name=images\

Initial_Frame=1
Final_Frame=10
Initial_Clock=0
Final_Clock=1

Debug_File=C:ani.txt

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