The meaning of preprocess_cameras.py

[013292]

I've got the sense that world_mat_ is the projection matrix converting 3d world coordinates to 2d pixel image coordinates; 'scale_mat_' is the normalization transform to move and scale the 3d object in world space to let it be centered at the origin and inside a unit sphere.
My question is why do we need to do that in such a sophisticated way? I checked the normalization matrix on DTU and data_BlendedMVS, It seems that for each object the normalization matrices are the same for all views. Then what kind of scenarios are this preprocess for? Thank you :-)

[guangxuwang]

@013292 i dont want to scale the 3d object, how can i revise the code?