High!



> No, the whole track profile is a lathe object! When I removed the ground 
> plane with the cutout, the black squares disappeared, but another 
> strange effect showed up (see attached images). In the oblique view it 
> looks as the side parts of the track profile extend much further than 
> its bottom, although the overhead view shows that this is not the 
> case... strange!

Obviously it is because the profile contains a hollow shaped like an 
upside-down "T" (which was intended!), so that the vertical side parts 
do not connect with the ground immediately.

The black squares disappeared when I corrected my original precaution 
against coincident surfaces problems: in the cutout definition, I 
originally rotated the subtracting box 0.0001 degrees more than given in 
the angle parameter from the segment definition file, but forgot that in 
case of a left turn this tiny amount must be subtracted from the 
original value rather than added!

     object
     {
       Bend_Subtraction_Block
       #if (ang >=0)
         rotate y*(ang+0.0001)
       #else
         rotate y*(ang-0.0001)
       #end
     }

See you in Khyberspace!

Yadgar

Now playing: To The Shore (Duran Duran)

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