I'd like to pass a mat3 attribute to a Vertex Shader.
I know how to pass vectors but despite I tried almost everythng I don't manage to pass a ma3.
I know I could just pass 3 vec3 and combine them into a mat3 inside the shader but I'd rather use something more straightforward.

Maybe that's just not possible but I think I saw it once.

I need to know, anyway.