Nicolas Calimet wrote:
> 
> > They will be re-parsed (and a duplicate created) unless you make sure that
> > they are not.  The way you do this is to either:
> > 1) check the "clock" variable to see if it is the first frame
> 
I quote myself:

> Ok, it works fine if I do something like:
> 
> #if(clock=0)
>   box{ ...  label thebox }
> #else
>   modify{ thebox  ... }
> #end

	Well actually even that is not true. A persistent
object will not behave as a similar non-persistent object
after the second frame of animation. Rotating the persistent
object through the modify statement will be wrong, while
translations seem to work properly.
	I tried the following code (render with 3 or more
frames):



#version unofficial MegaPOV 0.5;

#declare RATIO  = 640/480;

global_settings { ambient_light 0.01  max_trace_level 20 }

camera
{
  right    x
  up       y/RATIO
  angle    12
  location -300*z
  look_at  <0,0,0>
}

light_source{ -300*z  rgb 0.66  shadowless }
light_source{ -300*z  rgb 1.00  rotate <45,-25,0> }

background{ rgb 1 }

#declare Red   = texture{pigment{rgb<1,0,0>}}
#declare Green = texture{pigment{rgb<0,1,0>}}
#declare Blue  = texture{pigment{rgb<0,0,1>}}

// Is it also a persistent variable ?
#declare mbox = mesh
{
  triangle{ <-10,10,-10>,<10,10,-10>,<10,10,10>  texture{Red} }
  triangle{ <-10,10,-10>,<-10,10,10>,<10,10,10>  texture{Red} }
  triangle{ <-10,-10,-10>,<10,-10,-10>,<10,-10,10> }
  triangle{ <-10,-10,-10>,<-10,-10,10>,<10,-10,10> }
  triangle{ <-10,-10,-10>,<-10,-10,10>,<-10,10,10> }
  triangle{ <-10,-10,-10>,<-10,10,-10>,<-10,10,10> }
  triangle{ <10,-10,-10>,<10,-10,10>,<10,10,10>  texture{Green} }
  triangle{ <10,-10,-10>,<10,10,-10>,<10,10,10>  texture{Green} }
  triangle{ <-10,-10,-10>,<10,-10,-10>,<-10,10,-10>  texture{Blue} }
  triangle{ <-10,10,-10>,<10,10,-10>,<10,-10,-10>  texture{Blue} }
  triangle{ <-10,-10,10>,<10,-10,10>,<-10,10,10> }
  triangle{ <-10,10,10>,<10,10,10>,<10,-10,10> }
  texture{ pigment{ color rgb 0.9 } }
  rotate <45,0,0>
}

// right box
object{ mbox  rotate y*60*clock  translate  11*x }

// left box (persistent object)
#if(clock=0)
  object{ mbox  translate -11*x  label thebox }
#else
  // Move back to the center, rotate, and translate again to its old position
  // But what's appening to rotations after the second frame ?
  modify{ thebox  translate 11*x  rotate y*60*clock  translate -11*x }
#end

#render concat("\nClock value is ",str(clock,0,3))



*** Nicolas Calimet
*** pov### [at] freefr

Post a reply to this message