Best way to get how transform matrix are computed?

jojogodot

Hi, I would like to understand how Godot gets its transform matrix from the import of an animated model. The matrix are different from Blender and I would like to follow the logic, step by step, seeing the values being transformed.

The first idea is to compile godot in debug mode and launch gdb and add breakpoints. The second idea is to add prints of the desired values in the source code in the function I am interested in, then compile it.

But are there other solutions that can be obtained by scripts for example before I dive the other route?

Thanks

cybereality

What exactly is it you need? The matrix in Godot for animation is a 3x3 rotation matrix. If there is a difference, it may be between row or column major. Also Blender and Godot use a different axis for up. I'm not sure if right or left handed coordinate spaces make a difference (I think for matrices they do not) but that may affect the conversion.

jojogodot

I am not good enough with matrix calculation as far as spaces are involved, and I want to double check my calculations with a known to be correct library. So it is definitely a learning process I am after. :) I will add some message prints and recompile Godot I guess..

cybereality

Printing out a matrix won't be very helpful as it is very difficult to tell what it means just by looking at the numbers. I'm not sure that is really a good idea.

duane

If you're not sure you have a decent grasp of matrix calculations in general, this might help.