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Function multiplyScalarAndAdd

multiplyScalarAndAdd(
    out: mat4,
    a: ReadonlyMat4,
    b: ReadonlyMat4,
    scale: number,
): mat4
Adds two mat4's after multiplying each element of the second operand by a scalar value.
Parameters
- out: mat4
  the receiving vector
- a: ReadonlyMat4
  the first operand
- b: ReadonlyMat4
  the second operand
- scale: number
  the amount to scale b's elements by before adding
Returns mat4
out

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