hi,

> changed to 3.7. no difference.

I used a 3.8.0-alpha, but with the '3.7' version directive.

I changed 'floorframe' to a 'box {0,1}' and in the loop gave the object a
different pigment on each iteration (just cycling through r/g/b).  the box does
move :-)  your "grey" box is "in the way", there are coinciding surfaces (I'm
guessing looking at output).  suggest/recommend you write the scene with simple
unit dimensions, and do the exact stepping / locating / sizing when you're happy
with the basic thing.  (if needed can clean up code and post later/tomorrow).


regards, jr.

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