Function add

add(out: mat4.Mat4, a: mat4.Mat4, b: mat4.Mat4): mat4.Mat4
Adds two mat4's
Parameters
- out: mat4.Mat4
  the receiving matrix
- a: mat4.Mat4
  the first operand
- b: mat4.Mat4
  the second operand
Returns mat4.Mat4
out
- Defined in core/mat4.ts:2233