/** A view matrix defined by an eye and target position (same as gluLookAt) */
public static Mat4f lookAt(
float eyeX,
float eyeY,
float eyeZ,
float centerX,
float centerY,
float centerZ,
float upX,
float upY,
float upZ) {
Vec3f f = new Vec3f(centerX - eyeX, centerY - eyeY, centerZ - eyeZ).normalize();
Vec3f up = new Vec3f(upX, upY, upZ).normalize();
Vec3f s = f.cross(up).normalize();
Vec3f u = s.cross(f).normalize();
Mat4f m1 =
new Mat4f(
new float[] {s.x, u.x, -f.x, 0, s.y, u.y, -f.y, 0, s.z, u.z, -f.z, 0, 0, 0, 0, 1});
Mat4f m2 = translation(-eyeX, -eyeY, -eyeZ);
return m1.times(m2);
}
public void setTransform(Mat4f xform) {
Mat4f totalXform = xform.mul(offsetTransform);
for (int i = 0; i < getNumChildren(); i++) {
getChild(i).setTransform(totalXform);
}
}
public ManipPartTransform() {
super();
offsetTransform = new Mat4f();
offsetTransform.makeIdent();
}
public void push(State state) {
ModelMatrixElement prev = (ModelMatrixElement) getNextInStack();
if (prev != null) {
matrix.set(prev.matrix);
}
}
public ModelMatrixElement() {
matrix = new Mat4f();
matrix.makeIdent();
}
/** Multiplies this element by the given matrix. */
public void multElt(Mat4f matrix) {
temp.set(this.matrix);
this.matrix.mul(temp, matrix);
}
/** Sets this element to the identity matrix. */
public void makeEltIdent() {
matrix.makeIdent();
}
