rotation matrix : how does it work for flip?

[VLEFF]

Hi,

I just realised that both flip and rotation informations are in the rotation matrix (_r), but how does it work exactly?
How can I say when it is rotation or when it is flip? How can I know that there is a rotation and a flip at the same time?
Rotation and flip are two differents thing right? So I don't get why there is not two different attributes?

Exemple (based on datas collected from .vox file):

Rotation Z 90° :
0 -1 0
1 0 0
0 0 1

flip Y :
1 0 0
0 -1 0
0 0 1

Rotation Z 90° + flip Y :
0 -1 0
-1 0 0
0 0 1

So, from the last one, how can I extract the two first to apply them both?

[VLEFF]

My workaround for the moment :
I have extracted all the possible cases and made some kind of dictionnary, but you know... it's ugly =(

@ephtracy do you have the answer?

[ephtracy]

one pose can be achieved by different transform sequences.
For example, in your case, the final pose can be achieved by:
1.Rot Z 90 + Flip Y, or
2. Rot Z -90 + Flip X
One workaround: cross product first and second rows, and check the sign with the third row to figure out whether it has been flipped.

[hnim]

hi, how can I parse rotation and scale (flip) from _r attribute?

[TheStrokeForge]

Hi there! Can someone please help me in separating the Rotation and flip values from each other? Thanks!

[TheStrokeForge]

one pose can be achieved by different transform sequences. For example, in your case, the final pose can be achieved by: 1.Rot Z 90 + Flip Y, or 2. Rot Z -90 + Flip X One workaround: cross product first and second rows, and check the sign with the third row to figure out whether it has been flipped.

I did this, but how do I figure out in which axis is the flip applied? And then How do I separate it? Thanks!