The scale matrix must have its homogeneous 'w' (at mat[3][3]) set to the scale in order to also scale the translations along with it. However, this also scales the transform matrix's 'w' component, which is not supposed to happen.
The scale matrix must have its homogeneous 'w' (at mat[3][3]) set to the scale in order to also scale the translations along with it. However, this also scales the transform matrix's 'w' component, which is not supposed to happen.