Matrix math.

[NicTanghe]

To get all the transform out when decending to the leafs.
one wil need matrix math.
I was wondering if it belongs in this crate or in the end users logic ?

https://openusd.org/dev/api/class_gf_matrix4d.html

from_rows()
get_rows()
mult()
ident()

[NicTanghe]

MAybe its more optimised to use an external crate for maths but Im unsure about type conversion ects.

[laurooyen]

Good question, I’ve been debating myself if this crate should provide its own math library vs use an existing one. Not opposed to either solution and welcome arguments for both.

As of now this crate provides its own math types but no math functions. The XformOp code internally uses glam for some transformation math. One problem with glam is it being column major while usd is row major. It has to be seen if that detail will be part of the specification, which we should follow.

My engine which uses openusd already had its own math library and converts between its own types and this crates types. Facilitating interop with external math libraries could definitely be improved too.