Function normalFromMat4

normalFromMat4(
    out: mat3.Mat3,
    a: readonly [
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
    ],
): mat3.Mat3
| null
Calculates a 3x3 normal matrix (transpose inverse) from the 4x4 matrix
Parameters
- out: mat3.Mat3
  mat3 receiving operation result
- a: readonly [
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
      number,
  ]
  Mat4 to derive the normal matrix from
Returns mat3.Mat3 | null
out
- Defined in core/mat3.ts:592