options: bit-coded options:
bit 0 set (1): back faces are culled
bit 1 set (2): overlay mesh is visible
bit 2 set (4): a simple shape is generated instead of a heightfield
bit 3 set (8): the heightfield is not respondable
shadingAngle: the shading angle
xPointCount/yPointCount: the number of rows and lines of the heightfield.
xSize: the length of the x side of the heightfield
heights: a pointer to xPointCount*yPointCount height values.
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