// /**
// * Merges this sphere with the given OBB.
// *
// * @param volume
// * The OBB to merge.
// * @return This sphere, after merging.
// */
// private BoundingSphere mergeOBB(OrientedBoundingBox volume) {
// // compute edge points from the obb
// if (!volume.correctCorners)
// volume.computeCorners();
// _mergeBuf.rewind();
// for (int i = 0; i < 8; i++) {
// _mergeBuf.put(volume.vectorStore[i].x);
// _mergeBuf.put(volume.vectorStore[i].y);
// _mergeBuf.put(volume.vectorStore[i].z);
// }
//
// // remember old radius and center
// float oldRadius = radius;
// Vector3f oldCenter = _compVect2.set( center );
//
// // compute new radius and center from obb points
// computeFromPoints(_mergeBuf);
// Vector3f newCenter = _compVect3.set( center );
// float newRadius = radius;
//
// // restore old center and radius
// center.set( oldCenter );
// radius = oldRadius;
//
// //merge obb points result
// merge( newRadius, newCenter, this );
//
// return this;
// }
private BoundingVolume merge(float temp_radius, Vector3f temp_center, BoundingSphere rVal) {
Vector3f vect1 = Vector3f.newInstance();
Vector3f diff = temp_center.subtract(center, vect1);
float lengthSquared = diff.lengthSquared();
float radiusDiff = temp_radius - radius;
float fRDiffSqr = radiusDiff * radiusDiff;
if (fRDiffSqr >= lengthSquared) {
if (radiusDiff <= 0.0f) {
Vector3f.recycle(vect1);
return this;
}
Vector3f rCenter = rVal.center;
if (rCenter == null) {
rVal.setCenter(rCenter = new Vector3f());
}
rCenter.set(temp_center);
rVal.setRadius(temp_radius);
Vector3f.recycle(vect1);
return rVal;
}
float length = (float) Math.sqrt(lengthSquared);
Vector3f rCenter = rVal.center;
if (rCenter == null) {
rVal.setCenter(rCenter = new Vector3f());
}
if (length > RADIUS_EPSILON) {
float coeff = (length + radiusDiff) / (2.0f * length);
rCenter.set(center.addLocal(diff.multLocal(coeff)));
} else {
rCenter.set(center);
}
rVal.setRadius(0.5f * (length + radius + temp_radius));
Vector3f.recycle(vect1);
return rVal;
}
/**
* <code>averagePoints</code> selects the sphere center to be the average of the points and the
* sphere radius to be the smallest value to enclose all points.
*
* @param points the list of points to contain.
*/
public void averagePoints(Vector3f[] points) {
logger.info("Bounding Sphere calculated using average points.");
center = points[0];
for (int i = 1; i < points.length; i++) {
center.addLocal(points[i]);
}
float quantity = 1.0f / points.length;
center.multLocal(quantity);
float maxRadiusSqr = 0;
for (int i = 0; i < points.length; i++) {
Vector3f diff = points[i].subtract(center);
float radiusSqr = diff.lengthSquared();
if (radiusSqr > maxRadiusSqr) {
maxRadiusSqr = radiusSqr;
}
}
radius = (float) Math.sqrt(maxRadiusSqr) + RADIUS_EPSILON - 1f;
}
