[Bf-committers] Changing mul_m4_m4m4 argument order

[Brecht Van Lommel]

Hi,

The argument order of the mul_m4_m4m4 C math function is inconsistent
with the others. This has always been the case, but I only recently
found this out, it explains quite a bit of confusion I've had in the
past working with matrices. Python is not affected by this.

For the details, see here:
http://wiki.blender.org/index.php/Dev:Source/Mathematics/Math_Library#Matrix-Matrix_Multiplication

It's easy to fix this in trunk, the main issue is for branches, just
changing the order of arguments to mul_m4_m4m4 will not show up as
conflicts in merges. A solution would be to change the function to a
different name. Do you think this is needed, and does anyone have a
good suggestion for a different name? I guess that would also cause
some confusion, but hopefully much less.

Thanks,
Brecht.