// Vec3Diff returns the rotation quaternion between two vectors.
func Vec3Diff(a, b *vec3.T) T {
	cr := vec3.Cross(a, b)
	sr := math.Sqrt(2 * (1 + vec3.Dot(a, b)))
	oosr := 1 / sr

	q := T{cr[0] * oosr, cr[1] * oosr, cr[2] * oosr, sr * 0.5}
	return q.Normalized()
}
Exemple #2
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// Dot returns the dot product of two (dived by w) vectors.
func Dot(a, b *T) float32 {
	a3 := a.Vec3DividedByW()
	b3 := b.Vec3DividedByW()
	return vec3.Dot(&a3, &b3)
}