Working but nothing so far

vec3.go

@@ -92,8 +92,20 @@ func (v Vector3) Unpack() (float64, float64, float64) {
 	return v.X, v.Y, v.Z
 }
 
-// Others maths thingies
+// Return position, and units vectors of spherical into cartesian coords (r, theta, phi) units vecs
+func (v Vector3) SphericalToCartesian() (Vector3, Vector3, Vector3, Vector3) {
+	p, theta, phi := v.Unpack()
+	cos_theta, sin_theta := math.Cos(theta), math.Sin(theta)
+	cos_phi, sin_phi := math.Cos(phi), math.Sin(phi)
 
+	cart_pos := Vector3{p * cos_theta * cos_phi, p * sin_theta * sin_phi, p * cos_theta}
+	unit_vec_r := Vector3{sin_theta * cos_phi, sin_theta * cos_phi, cos_theta}
+	unit_vec_theta := Vector3{cos_theta * cos_phi, cos_theta * sin_phi, -sin_theta}
+	unit_vec_phi := Vector3{-sin_phi, cos_phi, 0}
+	return cart_pos, unit_vec_r, unit_vec_theta, unit_vec_phi
+}
+
+// Others maths thingies
 func Clamp(x float64, a float64, b float64) float64 {
 	return min(max(x, a), b)
 }