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Are you sure that you aren't getting an oconv error ? You can troubleshoot your code by redirecting the stdout of oconv to a file. Then try and run rpict from command line using the same file that you wrote to in your C# code to see if your octree did get created without errors.

I have gotten the "fatal: truncated octree" error in the past due to incorrectly arranging materials in my files.

See below:

The file

#x.rad ..correct file..
!gensky 12 31 10

void plastic white
0
0
5 0.7 0.7 0.7 0 0

!genblinds white blinds 1 2 4 4 20 | xform -rz 90 -rx -90

works fine...

image description

While the file below won't work

#x.rad

!gensky 12 31 10


!genblinds white blinds 1 2 4 4 20 | xform -rz 90 -rx -90

void plastic white
0
0
5 0.7 0.7 0.7 0 0

image description