After reading a question in ScriptSpot, I decide to write some notes about with hope they helps somehow.
It is possible to make negative scale, but it's contentiousness is this is correct at all. In the nature not negative size, volume, scale, even no negative speed. But in the 3d software, even wrong concept, this is possible but... within limits! Shortly, if we want negative scale only for one dimension, for example only for Z axis, well, hard luck... i.e. (at least in 3ds Max) we can achieve negative scale only for all dimensions. For example [-1,-1,-1] is valid scale in 3ds Max, but to say [1,1,-1] is impossible/invalid scale value.
It is possible to make negative scale, but it's contentiousness is this is correct at all. In the nature not negative size, volume, scale, even no negative speed. But in the 3d software, even wrong concept, this is possible but... within limits! Shortly, if we want negative scale only for one dimension, for example only for Z axis, well, hard luck... i.e. (at least in 3ds Max) we can achieve negative scale only for all dimensions. For example [-1,-1,-1] is valid scale in 3ds Max, but to say [1,1,-1] is impossible/invalid scale value.
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