slerp

Performs Spherical Linear Interpolation between two 3D vectors a and b by an interpolant t.

Precondition: For a geometrically correct spherical interpolation that preserves magnitude (if inputs are normalized) and interpolates along the shortest arc on a sphere, input vectors a and b should ideally be normalized (unit length). If they are not, the interpolation will occur, but the path may not be a true arc on a sphere of constant radius, and magnitudes will also be interpolated in a complex way.

The interpolant t is required to be in the range [0.0, 1.0]. This implementation handles cases where a and b are nearly collinear by falling back to linear interpolation (lerp) to maintain numerical stability.

Parameters

Throws