/**
* Converts a point from Spherical coordinates to Cartesian (using positive Z as up) and stores
* the results in the store var.
*/
public static PVector sphericalToCartesianZ(PVector sphereCoords, PVector store) {
store.z = sphereCoords.x * FastMath.sin(sphereCoords.z);
float a = sphereCoords.x * FastMath.cos(sphereCoords.z);
store.x = a * FastMath.cos(sphereCoords.y);
store.y = a * FastMath.sin(sphereCoords.y);
return store;
}
/**
* Converts a point from Cartesian coordinates (using positive Z as up) to Spherical and stores
* the results in the store var. (Radius, Azimuth, Polar)
*/
public static PVector cartesianZToSpherical(PVector cartCoords, PVector store) {
if (cartCoords.x == 0) cartCoords.x = FastMath.FLT_EPSILON;
store.x =
FastMath.sqrt(
(cartCoords.x * cartCoords.x)
+ (cartCoords.y * cartCoords.y)
+ (cartCoords.z * cartCoords.z));
store.z = FastMath.atan(cartCoords.z / cartCoords.x);
if (cartCoords.x < 0) store.z += FastMath.PI;
store.y = FastMath.asin(cartCoords.y / store.x);
return store;
}