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Function lerp

lerp(out: vec4, a: ReadonlyVec4, b: ReadonlyVec4, t: number): vec4
Performs a linear interpolation between two vec4's
Parameters
- out: vec4
  the receiving vector
- a: ReadonlyVec4
  the first operand
- b: ReadonlyVec4
  the second operand
- t: number
  interpolation amount, in the range [0-1], between the two inputs
Returns vec4
out

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