hello,

on the /scenes/advanced/blocks, the 'stackertransp.pov' demo file hang 
with this error :

"makestacks.inc" line 24 - Parse Error: Expected 'numeric expression', 
undeclared identifier 'AspectRatio' found instead

the code is :
#declare Screen= // pseudo screen to test the visibility of an object
   mesh{
     triangle{0,x,x+y}
     triangle{0,y,x+y}
     translate -0.5*(x+y)
     scale <AspectRatio,1,1> <-- ligne 24.
     translate CamZoom*z
     matrix < CamR.x,  CamR.y,  CamR.z,
              CamU.x,  CamU.y,  CamU.z,
              CamD.x,  CamD.y,  CamD.z,
              CamLoc.x,CamLoc.y,CamLoc.z >
   }

in the original 'visibility test' from thomas de groot, there is an 
'AspectRatio' declared var.
//--start code--
#declare CamLoc = <0, .3, 0>;
#declare CamEye = <0.0, 6,  0.0>;
#declare CamSky = y;
#declare AspectRatio = 640/1000;
#declare CamZoom = 1.5;

camera {
   location  CamLoc
   direction z*CamZoom
   right     x*AspectRatio
   look_at   CamEye
}
...

and the modified code from gilles tran use this var but it's not declared...


if i remember good, in mac megapov, there is two vars 'image_height' and 
'image_width' and AspectRatio can be calculated by image_height/image_width.


how to deal now with povray 3.7 ?





---
Kurtz le pirate
Compagnie de la Banquise

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