/**
* Calculates the minimum bounding sphere of 4 points. Used in welzl's algorithm.
*
* @param O The 1st point inside the sphere.
* @param A The 2nd point inside the sphere.
* @param B The 3rd point inside the sphere.
* @param C The 4th point inside the sphere.
* @see #calcWelzl(java.nio.FloatBuffer)
*/
private void setSphere(final Vector3 O, final Vector3 A, final Vector3 B, final Vector3 C) {
final Vector3 a = A.subtract(O, null);
final Vector3 b = B.subtract(O, null);
final Vector3 c = C.subtract(O, null);
final double Denominator =
2.0
* (a.getX() * (b.getY() * c.getZ() - c.getY() * b.getZ())
- b.getX() * (a.getY() * c.getZ() - c.getY() * a.getZ())
+ c.getX() * (a.getY() * b.getZ() - b.getY() * a.getZ()));
if (Denominator == 0) {
_center.set(0, 0, 0);
setRadius(0);
} else {
final Vector3 o =
a.cross(b, null)
.multiplyLocal(c.lengthSquared())
.addLocal(c.cross(a, null).multiplyLocal(b.lengthSquared()))
.addLocal(b.cross(c, null).multiplyLocal(a.lengthSquared()))
.divideLocal(Denominator);
setRadius(o.length() * radiusEpsilon);
O.add(o, _center);
}
}
@Override
public void startWalk(final Ray3 walkRay) {
// store ray
_walkRay.set(walkRay);
// simplify access to direction
final ReadOnlyVector3 direction = _walkRay.getDirection();
// Move start point to grid space
final Vector3 start = _walkRay.getOrigin().subtract(_gridOrigin, null);
_gridLocation[0] = (int) MathUtils.floor(start.getX() / _gridSpacing.getX());
_gridLocation[1] = (int) MathUtils.floor(start.getY() / _gridSpacing.getY());
final double invDirX = 1.0 / direction.getX();
final double invDirY = 1.0 / direction.getY();
// Check which direction on the X world axis we are moving.
if (direction.getX() > BresenhamZUpGridTracer.TOLERANCE) {
_distToNextXIntersection =
((_gridLocation[0] + 1) * _gridSpacing.getX() - start.getX()) * invDirX;
_distBetweenXIntersections = _gridSpacing.getX() * invDirX;
_stepXDirection = 1;
} else if (direction.getX() < -BresenhamZUpGridTracer.TOLERANCE) {
_distToNextXIntersection =
(start.getX() - _gridLocation[0] * _gridSpacing.getX()) * -direction.getX();
_distBetweenXIntersections = -_gridSpacing.getX() * invDirX;
_stepXDirection = -1;
} else {
_distToNextXIntersection = Double.MAX_VALUE;
_distBetweenXIntersections = Double.MAX_VALUE;
_stepXDirection = 0;
}
// Check which direction on the Y world axis we are moving.
if (direction.getY() > BresenhamZUpGridTracer.TOLERANCE) {
_distToNextYIntersection =
((_gridLocation[1] + 1) * _gridSpacing.getY() - start.getY()) * invDirY;
_distBetweenYIntersections = _gridSpacing.getY() * invDirY;
_stepYDirection = 1;
} else if (direction.getY() < -BresenhamZUpGridTracer.TOLERANCE) {
_distToNextYIntersection =
(start.getY() - _gridLocation[1] * _gridSpacing.getY()) * -direction.getY();
_distBetweenYIntersections = -_gridSpacing.getY() * invDirY;
_stepYDirection = -1;
} else {
_distToNextYIntersection = Double.MAX_VALUE;
_distBetweenYIntersections = Double.MAX_VALUE;
_stepYDirection = 0;
}
// Reset some variables
_rayLocation.set(start);
_totalTravel = 0.0;
_stepDirection = Direction.None;
}
@Override
public void applyFilter(final InteractManager manager) {
final SpatialState state = manager.getSpatialState();
final ReadOnlyVector3 scale = state.getTransform().getScale();
final double x = MathUtils.clamp(scale.getX(), _minScale.getX(), _maxScale.getX());
final double y = MathUtils.clamp(scale.getY(), _minScale.getY(), _maxScale.getY());
final double z = MathUtils.clamp(scale.getZ(), _minScale.getZ(), _maxScale.getZ());
state.getTransform().setScale(x, y, z);
}
/**
* Calculates the minimum bounding sphere of 2 points. Used in welzl's algorithm.
*
* @param O The 1st point inside the sphere.
* @param A The 2nd point inside the sphere.
* @see #calcWelzl(java.nio.FloatBuffer)
*/
private void setSphere(final Vector3 O, final Vector3 A) {
setRadius(
Math.sqrt(
((A.getX() - O.getX()) * (A.getX() - O.getX())
+ (A.getY() - O.getY()) * (A.getY() - O.getY())
+ (A.getZ() - O.getZ()) * (A.getZ() - O.getZ()))
/ 4f)
+ radiusEpsilon
- 1);
Vector3.lerp(O, A, .5, _center);
}
/** Defines the normals of each face of the pyramid. */
protected void setNormalData() {
Vector3 normal = new Vector3();
Vector3 work = new Vector3();
FloatBuffer norms = BufferUtils.createVector3Buffer(12);
// side 1
MathUtil.createNormal(normal, vert0, vert1, peak, work);
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
// side 2
MathUtil.createNormal(normal, vert1, vert2, peak, work);
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
// side 3
MathUtil.createNormal(normal, vert2, vert3, peak, work);
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
// side 4
MathUtil.createNormal(normal, vert3, vert0, peak, work);
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.put((float) normal.getX()).put((float) normal.getY()).put((float) normal.getZ());
norms.rewind();
sides.getMeshData().setNormalBuffer(norms);
}
@Override
public void setLocation(double x, double y, double z, boolean doEdit) {
super.setLocation(x - offset.getX(), y - offset.getY(), z - offset.getZ(), doEdit);
}
/**
* Update the vertices for this particle, taking size, spin and viewer into consideration. In the
* case of particle type ParticleType.GeomMesh, the original triangle normal is maintained rather
* than rotating it to face the camera or parent vectors.
*
* @param cam Camera to use in determining viewer aspect. If null, or if parent is not set to
* camera facing, parent's left and up vectors are used.
*/
public void updateVerts(final Camera cam) {
final double orient = parent.getParticleOrientation() + values[VAL_CURRENT_SPIN];
final double currSize = values[VAL_CURRENT_SIZE];
if (type == ParticleSystem.ParticleType.GeomMesh
|| type == ParticleSystem.ParticleType.Point) {; // nothing to do
} else if (cam != null && parent.isCameraFacing()) {
final ReadOnlyVector3 camUp = cam.getUp();
final ReadOnlyVector3 camLeft = cam.getLeft();
final ReadOnlyVector3 camDir = cam.getDirection();
if (parent.isVelocityAligned()) {
bbX.set(_velocity).normalizeLocal().multiplyLocal(currSize);
camDir.cross(bbX, bbY).normalizeLocal().multiplyLocal(currSize);
} else if (orient == 0) {
bbX.set(camLeft).multiplyLocal(currSize);
bbY.set(camUp).multiplyLocal(currSize);
} else {
final double cA = MathUtils.cos(orient) * currSize;
final double sA = MathUtils.sin(orient) * currSize;
bbX.set(camLeft)
.multiplyLocal(cA)
.addLocal(camUp.getX() * sA, camUp.getY() * sA, camUp.getZ() * sA);
bbY.set(camLeft)
.multiplyLocal(-sA)
.addLocal(camUp.getX() * cA, camUp.getY() * cA, camUp.getZ() * cA);
}
} else {
bbX.set(parent.getLeftVector()).multiplyLocal(0);
bbY.set(parent.getUpVector()).multiplyLocal(0);
}
final Vector3 tempVec3 = Vector3.fetchTempInstance();
final FloatBuffer vertexBuffer = parent.getParticleGeometry().getMeshData().getVertexBuffer();
switch (type) {
case Quad:
{
_position.subtract(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 0);
_position.subtract(bbX, tempVec3).addLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
_position.add(bbX, tempVec3).addLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 2);
_position.add(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 3);
break;
}
case GeomMesh:
{
final Quaternion tempQuat = Quaternion.fetchTempInstance();
final ReadOnlyVector3 norm = triModel.getNormal();
if (orient != 0) {
tempQuat.fromAngleNormalAxis(orient, norm);
}
for (int x = 0; x < 3; x++) {
if (orient != 0) {
tempQuat.apply(triModel.get(x), tempVec3);
} else {
tempVec3.set(triModel.get(x));
}
tempVec3.multiplyLocal(currSize).addLocal(_position);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + x);
}
Quaternion.releaseTempInstance(tempQuat);
break;
}
case Triangle:
{
_position
.subtract(3 * bbX.getX(), 3 * bbX.getY(), 3 * bbX.getZ(), tempVec3)
.subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 0);
_position.add(bbX, tempVec3).addLocal(3 * bbY.getX(), 3 * bbY.getY(), 3 * bbY.getZ());
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
_position.add(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 2);
break;
}
case Line:
{
_position.subtract(bbX, tempVec3);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex);
_position.add(bbX, tempVec3);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
break;
}
case Point:
{
BufferUtils.setInBuffer(_position, vertexBuffer, startIndex);
break;
}
}
Vector3.releaseTempInstance(tempVec3);
}
/**
* Sets the vertices that make the pyramid. Where the center of the box is the origin and the base
* and height are set during construction.
*/
protected void setVertexData() {
peak = new Vector3(0, 0, 0);
vert0 = new Vector3(-width / 2, -height / 2, -length);
vert1 = new Vector3(width / 2, -height / 2, -length);
vert2 = new Vector3(width / 2, height / 2, -length);
vert3 = new Vector3(-width / 2, height / 2, -length);
FloatBuffer verts = BufferUtils.createVector3Buffer(12);
// side 1
verts.put((float) vert0.getX()).put((float) vert0.getY()).put((float) vert0.getZ());
verts.put((float) vert1.getX()).put((float) vert1.getY()).put((float) vert1.getZ());
verts.put((float) peak.getX()).put((float) peak.getY()).put((float) peak.getZ());
// side 2
verts.put((float) vert1.getX()).put((float) vert1.getY()).put((float) vert1.getZ());
verts.put((float) vert2.getX()).put((float) vert2.getY()).put((float) vert2.getZ());
verts.put((float) peak.getX()).put((float) peak.getY()).put((float) peak.getZ());
// side 3
verts.put((float) vert2.getX()).put((float) vert2.getY()).put((float) vert2.getZ());
verts.put((float) vert3.getX()).put((float) vert3.getY()).put((float) vert3.getZ());
verts.put((float) peak.getX()).put((float) peak.getY()).put((float) peak.getZ());
// side 4
verts.put((float) vert3.getX()).put((float) vert3.getY()).put((float) vert3.getZ());
verts.put((float) vert0.getX()).put((float) vert0.getY()).put((float) vert0.getZ());
verts.put((float) peak.getX()).put((float) peak.getY()).put((float) peak.getZ());
verts.rewind();
sides.getMeshData().setVertexBuffer(verts);
}
