Function fromMat4

fromMat4(out, a): mat3
Copies the upper-left 3x3 values into the given mat3.
Parameters
- out: mat3
  the receiving 3x3 matrix
- a: ReadonlyMat4
  the source 4x4 matrix
Returns mat3
out
- Defined in node_modules/gl-matrix/index.d.ts:617

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