public boolean validate(float x1, float z1, float x2, float z2, Spatial spatial) {
// generate the start and destination points
Vector3f start = new Vector3f(x1, EStats.SnowballHeight.getValue(), z1);
Vector3f destination = new Vector3f(x2, EStats.SnowballHeight.getValue(), z2);
// convert points to world coordinate system
spatial.localToWorld(start, start);
spatial.localToWorld(destination, destination);
// generate Ray for intersection detection
Vector3f direction = destination.subtract(start).normalizeLocal();
Ray moveRay = new Ray(start, direction);
// calculate the intersection between the move ray and the spatial
Vector3f hitPoint = getIntersection(moveRay, spatial, null, false);
// if there is no hit point, it is a valid throw
if (hitPoint == null) return true;
// if there is a hit point, compare the distances.
float distance1 = start.distanceSquared(destination);
float distance2 = start.distanceSquared(hitPoint);
if (distance1 <= distance2) return true;
else return false;
}
public Vector3f getDestination(float x1, float z1, float x2, float z2, Spatial spatial) {
// generate the start and destination points
Vector3f start = new Vector3f(x1, EStats.SnowmanHeight.getValue() / 2.0f, z1);
Vector3f destination = new Vector3f(x2, EStats.SnowmanHeight.getValue() / 2.0f, z2);
// convert points to world coordinate system
spatial.localToWorld(start, start);
spatial.localToWorld(destination, destination);
// generate Ray for intersection detection
Vector3f direction = destination.subtract(start).normalizeLocal();
Ray moveRay = new Ray(start, direction);
// calculate the intersection between the move ray and the spatial
Vector3f hitPoint = getIntersection(moveRay, spatial, null, false);
// if there are no obstacles, return the destination directly
if (hitPoint == null) {
spatial.worldToLocal(destination, destination);
return destination;
} else {
float originalDistance = destination.distance(start);
float newDistance = hitPoint.distance(start);
if (originalDistance > newDistance - EStats.BackoffDistance.getValue()) {
// we are either trying to go through a hit point
// or got too close to one
direction.multLocal(EStats.BackoffDistance.getValue());
Vector3f newDestination = hitPoint.subtractLocal(direction);
spatial.worldToLocal(newDestination, newDestination);
return newDestination;
} else {
// destination is not close to any hit points so
// we can just return it directly
spatial.worldToLocal(destination, destination);
return destination;
}
}
}