static Vector3f getCenter(final Vector<Vector3f> theVertices, final Triangle theTriangle) {
final Vector3f myCenter = new Vector3f();
final Vector3f v0 = theVertices.get(theTriangle.p[0]);
final Vector3f v1 = theVertices.get(theTriangle.p[1]);
final Vector3f v2 = theVertices.get(theTriangle.p[2]);
final Vector3f myNormal = new Vector3f(0, 0, 1);
final Vector3f pA = mathematik.Util.sub(v2, v0);
pA.scale(0.5f);
Vector3f pAc = new Vector3f();
pAc.cross(pA, myNormal);
pAc.add(v0);
pAc.add(pA);
pA.add(v0);
final Vector3f pB = mathematik.Util.sub(v2, v1);
pB.scale(0.5f);
Vector3f pBc = new Vector3f(pB);
pBc.cross(pB, myNormal);
pBc.add(v1);
pBc.add(pB);
pB.add(v1);
mathematik.Intersection.lineLineIntersect(pA, pAc, pB, pBc, myCenter, new Vector3f(), null);
return myCenter;
}
public void pre_step() {
Vector3f ab = mathematik.Util.sub(mParticleA.position(), mParticleB.position());
Vector3f cb = mathematik.Util.sub(mParticleC.position(), mParticleB.position());
final float mCurrentAngle = ab.angle(cb);
if (mCurrentAngle < mMinAngle) {
final int TINY_FACTOR_MODELL = 0;
final int TRIG_MODELL = 1;
final int MAX_DISTANCE_MODELL = 2;
final int mModell = TRIG_MODELL;
switch (mModell) {
case TINY_FACTOR_MODELL:
{
final float TINY_FACTOR = 1.1f;
final float mDistance =
mParticleA.position().distance(mParticleC.position()) * TINY_FACTOR;
restlength(mDistance);
}
break;
case TRIG_MODELL:
{
// a = sqrt ( b*b + c*c - 2bc*cosA )
final float b = ab.length();
final float c = cb.length();
final float mDistance =
(float) Math.sqrt(b * b + c * c - 2 * b * c * (float) Math.cos(mMinAngle));
restlength(mDistance);
}
break;
case MAX_DISTANCE_MODELL:
{
final float mDistance =
mParticleA.position().distance(mParticleB.position())
+ mParticleC.position().distance(mParticleB.position());
restlength(mDistance);
}
break;
}
active(true);
}
}
