Function fromMat4

fromMat4(
    out: mat3.Mat3,
    a: readonly [
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
    ],
): mat3.Mat3
Copies the upper-left 3x3 values into the given mat3.
Parameters
- out: mat3.Mat3
  the receiving 3x3 matrix
- a: readonly [
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
  ]
  the source 4x4 matrix
Returns mat3.Mat3
out
- Defined in core/mat3.ts:28