Function lerp2

lerp2(
    a1: Vec4,
    b1: Vec4,
    a2: Vec4,
    b2: Vec4,
    s: number,
    t: number,
    c: Vec4,
    tmp?: Vec4,
): Vec4
Bilinear interpolation between a1, b1, a2 and b2 based on s and t, where s and t are numbers between 0.0 and 1.0. The result is stored in c.

The calculation is as follows: a1 and b1 are interpolated based on s to give p, a2 and b2 are interpolated based on s to give q, and then the final result is obtained by interpolating p and q based on t.

The result will be equal to a1 when both s and t is 0.0, equal to a2 when s is 0.0 and t is 1.0, equal to b1 when s is 1.0 and t is 0.0, and equal to b2 when both s and t is 1.0
Parameters
- a1: Vec4
  the first start value - a 4-element vector object
- b1: Vec4
  the first end value - a 4-element vector object
- a2: Vec4
  the second start value - a 4-element vector object
- b2: Vec4
  the second end value - a 4-element vector object
- s: number
  a floating point number in the interval [0.0, 1.0]
- t: number
  a floating point number in the interval [0.0, 1.0]
- c: Vec4
  a 4-element vector in which to store the result
- Optionaltmp: Vec4
  an optional 4-element vector for temporary storage. If not provided, one will be created (and then discarded) internally
Returns Vec4
c - the interpolation result
- Defined in vec4.ts:527