public void reconstruct(final Vector3 top, final Vector3 bottom, final double radius) {
// our temp vars
final Vector3 localTranslation = Vector3.fetchTempInstance();
final Vector3 capsuleUp = Vector3.fetchTempInstance();
// first make the capsule the right shape
height = top.distance(bottom);
this.radius = radius;
setGeometryData();
// now orient it in space.
localTranslation.set(_localTransform.getTranslation());
top.add(bottom, localTranslation).multiplyLocal(.5);
// rotation that takes us from 0,1,0 to the unit vector described by top/center.
top.subtract(localTranslation, capsuleUp).normalizeLocal();
final Matrix3 rotation = Matrix3.fetchTempInstance();
rotation.fromStartEndLocal(Vector3.UNIT_Y, capsuleUp);
_localTransform.setRotation(rotation);
Vector3.releaseTempInstance(localTranslation);
Vector3.releaseTempInstance(capsuleUp);
Matrix3.releaseTempInstance(rotation);
updateWorldTransform(false);
}
@Override
public void apply(final double dt, final Particle particle, final int index) {
final Vector3 pVelocity = particle.getVelocity();
// determine if the particle is in the inner or outer zone
final double pDist = particle.getPosition().distanceSquared(_swarmPoint);
final Vector3 workVect = Vector3.fetchTempInstance();
final Vector3 workVect2 = Vector3.fetchTempInstance();
final Matrix3 workMat = Matrix3.fetchTempInstance();
workVect.set(_swarmPoint).subtractLocal(particle.getPosition()).normalizeLocal();
workVect2.set(pVelocity).normalizeLocal();
if (pDist > _swarmRangeSQ) {
// IN THE OUTER ZONE...
// Determine if the angle between particle velocity and a vector to
// the swarmPoint is less than the accepted deviance
final double angle = workVect.smallestAngleBetween(workVect2);
if (angle < _deviance) {
// if it is, increase the speed speedBump over time
if (pVelocity.lengthSquared() < maxSpeedSQ) {
final double change = _speedBump * dt;
workVect2.multiplyLocal(change); // where workVector2 = pVelocity.normalizeLocal()
pVelocity.addLocal(workVect2);
}
} else {
final Vector3 axis = workVect2.crossLocal(workVect);
// if it is not, shift the velocity to bring it back in line
if ((Double.doubleToLongBits(pVelocity.lengthSquared()) & 0x1d) != 0) {
workMat.fromAngleAxis(_turnSpeed * dt, axis);
} else {
workMat.fromAngleAxis(-_turnSpeed * dt, axis);
}
workMat.applyPost(pVelocity, pVelocity);
}
} else {
final Vector3 axis = workVect2.crossLocal(workVect);
// IN THE INNER ZONE...
// Alter the heading based on how fast we are going
if ((index & 0x1f) != 0) {
workMat.fromAngleAxis(_turnSpeed * dt, axis);
} else {
workMat.fromAngleAxis(-_turnSpeed * dt, axis);
}
workMat.applyPost(pVelocity, pVelocity);
}
Vector3.releaseTempInstance(workVect);
Vector3.releaseTempInstance(workVect2);
Matrix3.releaseTempInstance(workMat);
}
/**
* update position (using current position and velocity), color (interpolating between start and
* end color), size (interpolating between start and end size), spin (using parent's spin speed)
* and current age of particle. If this particle's age is greater than its lifespan, it is set to
* status DEAD.
*
* <p>Note that this only changes the parameters of the Particle, not the geometry the particle is
* associated with.
*
* @param secondsPassed number of seconds passed since last update.
* @return true if this particle is not ALIVE (in other words, if it is ready to be reused.)
*/
public boolean updateAndCheck(final double secondsPassed) {
if (status != Status.Alive) {
return true;
}
currentAge += secondsPassed * 1000; // add ms time to age
if (currentAge > lifeSpan) {
killParticle();
return true;
}
final Vector3 temp = Vector3.fetchTempInstance();
_position.addLocal(_velocity.multiply(secondsPassed * 1000f, temp));
Vector3.releaseTempInstance(temp);
// get interpolated values from appearance ramp:
parent.getRamp().getValuesAtAge(currentAge, lifeSpan, currColor, values, parent);
// interpolate colors
final int verts = ParticleSystem.getVertsForParticleType(type);
for (int x = 0; x < verts; x++) {
BufferUtils.setInBuffer(
currColor, parent.getParticleGeometry().getMeshData().getColorBuffer(), startIndex + x);
}
// check for tex animation
final int newTexIndex = parent.getTexAnimation().getTexIndexAtAge(currentAge, lifeSpan, parent);
// Update tex coords if applicable
if (currentTexIndex != newTexIndex) {
// Only supported in Quad type for now.
if (ParticleType.Quad.equals(parent.getParticleType())) {
// determine side
final float side = (float) Math.sqrt(parent.getTexQuantity());
int index = newTexIndex;
if (index >= parent.getTexQuantity()) {
index %= parent.getTexQuantity();
}
// figure row / col
final float row = side - (int) (index / side) - 1;
final float col = index % side;
// set texcoords
final float sU = col / side, eU = (col + 1) / side;
final float sV = row / side, eV = (row + 1) / side;
final FloatBuffer texs =
parent.getParticleGeometry().getMeshData().getTextureCoords(0).getBuffer();
texs.position(startIndex * 2);
texs.put(eU).put(sV);
texs.put(eU).put(eV);
texs.put(sU).put(eV);
texs.put(sU).put(sV);
texs.clear();
}
currentTexIndex = newTexIndex;
}
return false;
}
public void killParticle() {
setStatus(Status.Dead);
final Vector3 tempVec3 = Vector3.fetchTempInstance();
final FloatBuffer vertexBuffer = parent.getParticleGeometry().getMeshData().getVertexBuffer();
BufferUtils.populateFromBuffer(tempVec3, vertexBuffer, startIndex);
final int verts = ParticleSystem.getVertsForParticleType(type);
for (int x = 1; x < verts; x++) {
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + x);
}
Vector3.releaseTempInstance(tempVec3);
}
@Override
public void computeFromPrimitives(
final MeshData data, final int section, final int[] indices, final int start, final int end) {
if (end - start <= 0) {
return;
}
final int vertsPerPrimitive = data.getIndexMode(section).getVertexCount();
final Vector3[] vertList = new Vector3[(end - start) * vertsPerPrimitive];
Vector3[] store = new Vector3[vertsPerPrimitive];
int count = 0;
for (int i = start; i < end; i++) {
store = data.getPrimitiveVertices(indices[i], section, store);
for (int j = 0; j < vertsPerPrimitive; j++) {
vertList[count++] = Vector3.fetchTempInstance().set(store[0]);
}
}
averagePoints(vertList);
for (int i = 0; i < vertList.length; i++) {
Vector3.releaseTempInstance(vertList[i]);
}
}
/**
* 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);
}