/**
* Computes the new transform for this interpolator for a given alpha value.
*
* @param alphaValue alpha value between 0.0 and 1.0
* @param transform object that receives the computed transform for the specified alpha value
* @since Java 3D 1.3
*/
public void computeTransform(float alphaValue, Matrix4f transform) {
transform.loadIdentity();
// compute the current value of u from alpha and the
// determine lower and upper knot points
computePathInterpolation(alphaValue);
// Determine the segment within which we will be interpolating
currentSegmentIndex = this.lowerKnot - 1;
// if we are at the start of the curve
if (currentSegmentIndex == 0 && currentU == 0f) {
iQuat.set(keyFrames[1].quat);
iPos.set(keyFrames[1].position);
iScale.set(keyFrames[1].scale);
// if we are at the end of the curve
} else if (currentSegmentIndex == (numSegments - 1) && currentU == 1.0) {
iQuat.set(keyFrames[upperKnot].quat);
iPos.set(keyFrames[upperKnot].position);
iScale.set(keyFrames[upperKnot].scale);
// if we are somewhere in between the curve
} else {
// Get a reference to the current spline segment i.e. the
// one bounded by lowerKnot and upperKnot
currentSegment = cubicSplineCurve.getSegment(currentSegmentIndex);
// interpolate quaternions
currentSegment.getInterpolatedQuaternion(currentU, iQuat);
// interpolate position
currentSegment.getInterpolatedPositionVector(currentU, iPos);
// interpolate position
currentSegment.getInterpolatedScale(currentU, iScale);
}
// Alway normalize the quaternion
iQuat.normalize();
iQuat.toRotationMatrix(tMat);
// Set the translation components.
tMat.m03 = iPos.x;
tMat.m13 = iPos.y;
tMat.m23 = iPos.z;
rotation.set(tMat);
// construct a Transform3D from: axis * rotation * axisInverse
// transform.multLocal(axis);
transform.multLocal(rotation);
transform.scale(new Vector3f(iScale));
// transform.multLocal(axisInverse);
}
protected void regenInfluenceOffsets(int index) {
FloatBuffer verts, norms;
Vector3f vertex = new Vector3f();
Vector3f normal = new Vector3f();
Geometry geom = getSkin(index);
verts = geom.getVertexBuffer();
if (verts == null) {
logger.log(Level.FINE, "Skipping skin ''{0}'' because verts uninitialized", geom.getName());
return;
}
norms = geom.getNormalBuffer();
verts.clear();
norms.clear();
for (ArrayList<BoneInfluence> infs : cache[index]) {
vertex.set(verts.get(), verts.get(), verts.get());
normal.set(norms.get(), norms.get(), norms.get());
if (infs == null) continue;
if (bindMatrix != null) {
bindMatrix.mult(vertex, vertex);
bindMatrix.rotateVect(normal);
}
for (int x = infs.size() - 1; x >= 0; --x) {
BoneInfluence infl = infs.get(x);
if (infl.bone == null) continue;
infl.vOffset = new Vector3f(vertex);
infl.bone.bindMatrix.inverseTranslateVect(infl.vOffset);
infl.bone.bindMatrix.inverseRotateVect(infl.vOffset);
infl.nOffset = new Vector3f(normal);
infl.bone.bindMatrix.inverseRotateVect(infl.nOffset);
}
}
}
public void setBindMatrix(Matrix4f mat) {
bindMatrix = (mat != null && mat.isIdentity()) ? null : mat;
}