Function add

add(out: mat3, a: ReadonlyMat3, b: ReadonlyMat3): mat3
Adds two mat3's
Parameters
- out: mat3
  the receiving matrix
- a: ReadonlyMat3
  the first operand
- b: ReadonlyMat3
  the second operand
Returns mat3
out
- Defined in node_modules/gl-matrix/index.d.ts:831