Blender and .b3d

# matrices for changing y to up and z to depth (Blender is opposite)
matrixBlender2B3d = Mathutils.Matrix([1,0,0,0], \
[0,0,1,0], \
[0,-1,0,0], \
[0,0,0,1])

matrixB3d2Blender = Mathutils.Matrix([1,0,0,0], \
[0,0,-1,0], \ change in 1 not -1
[0,1,0,0], \
[0,0,0,1])


error in -1

i use for blender a script:

http://rafb.net/p/oZ9qa939.html

see this code for your exporter!