@Override
public BoundingBox getBounds() {
// If there are no charges, return an empty box.
if (charges.size() <= 0) return new BoundingBox(0, 0, 0, 0, 0, 0);
if (cachedBounds == null) {
// Start with the box of the first charge.
Charge c = charges.get(0);
double ext = Math.abs(c.w);
double corr = 1.0 + (0.1 / hardness); // see note
cachedBounds =
new BoundingBox(
new Vec3(c.x - ext, c.y - ext, c.z - ext).times(corr),
new Vec3(c.x + ext, c.y + ext, c.z + ext).times(corr));
// A note on "corr":
// As blobs are blobby, we can't use their weight/radius
// directly. This would result in unwanted cut-off's. To
// correct this, we extend the bounding box of a charge "a
// bit". That "bit" can be smaller if the charge is harder.
// Iteratively add the remaining charges.
for (int i = 1; i < charges.size(); i++) {
c = charges.get(i);
ext = Math.abs(c.w);
corr = 1.0 + (0.1 / hardness);
cachedBounds.extend(
new BoundingBox(
new Vec3(c.x - ext, c.y - ext, c.z - ext).times(corr),
new Vec3(c.x + ext, c.y + ext, c.z + ext).times(corr)));
}
}
return cachedBounds;
}
@Override
public WireframeMesh getWireframeMesh() {
if (cachedWire != null) return cachedWire;
// This is a dirty hack.
// TODO: Remove it!
Vec3 vert[] = new Vec3[0];
int[] from = new int[0];
int[] to = new int[0];
if (charges.size() <= 0) {
cachedWire = new NullObject().getWireframeMesh();
return cachedWire;
}
for (Charge c : charges) {
double rad = c.w;
Sphere s = new Sphere(rad, rad, rad);
WireframeMesh wfm = s.getWireframeMesh();
Vec3[] vert2 = new Vec3[vert.length + wfm.vert.length];
int i;
for (i = 0; i < vert.length; i++) vert2[i] = vert[i];
for (Vec3 v : wfm.vert) vert2[i++] = v.plus(new Vec3(c.x, c.y, c.z));
int[] from2 = new int[from.length + wfm.from.length];
for (i = 0; i < from.length; i++) from2[i] = from[i];
for (int foreign = 0; foreign < wfm.from.length; foreign++)
from2[i++] = wfm.from[foreign] + vert.length;
from = from2;
int[] to2 = new int[to.length + wfm.to.length];
for (i = 0; i < to.length; i++) to2[i] = to[i];
for (int foreign = 0; foreign < wfm.to.length; foreign++)
to2[i++] = wfm.to[foreign] + vert.length;
to = to2;
vert = vert2;
}
return (cachedWire = new WireframeMesh(vert, from, to));
}