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Stretch a bitmap on all the polygons that belong to a group.
works best if the group is flat like floor or terrain.
If group_handle==NULL it will effect the whole world
If bitmap_handle==NULL it wont change the bitmap.
Note that if you want the bitmap to repeat more than once on the model (tile mode)
then the dimensions of the bitmap must be in the power of two (for example 32,64,128,256,512,1024,2048 etc ...
all these numbers are powers of two).
set_second_bitmap:
If 1 is given then the second bitmap will be set. If 0 then the first bitmap will be set
returns OK or VR_ERROR
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