locate a certain point in the scene 3D

[Johannes]

Thank you, I found a way to do it. Your suggestions (I used the intersect-approach) helped!
Johannes

P.S. is there a way to bring self illumination (from 3ds) to vizard?
Did not find anything in the help-file

viz.TEXGEN
Automatically generate texture coordinates to simulate sphere mapping (reflective surface).

viz.TEXMIPMAP
Linear and mipmap filtering for texture magnification and minification.

viz.TEXNEAREST
Do not perform mipmapping of the texture.

viz.MODULATE
Force modulation of texture with any scene lights and the surfaces underlying material color properties.

viz.DECAL
Display the exact bitmap as the surface texture.

viz.ENVIRONMENT_MAP
Automatically generate texture coordinates to reflect an environment map (aka cube mapping).