public static void jLookAt(GL2 gl, JVector3d eye, JVector3d at, JVector3d up) {
// Define our look vector (z axis)
JVector3d look = at.operatorSub(eye);
look.normalize();
// Define our new x axis
JVector3d xaxis = JMaths.jCross(look, up);
xaxis.normalize();
// Define our new y axis as the cross of the x and z axes
JVector3d upv = JMaths.jCross(xaxis, look);
// Turn around the z axis
look.mul(-1.0);
// Put it all into a GL-friendly matrix
double[] dm = new double[16];
dm[0] = xaxis.getX();
dm[1] = xaxis.getY();
dm[2] = xaxis.getZ();
dm[3] = 0.f;
dm[4] = upv.getX();
dm[5] = upv.getY();
dm[6] = upv.getZ();
dm[7] = 0.f;
dm[8] = look.getX();
dm[9] = look.getY();
dm[10] = look.getZ();
dm[11] = 0.f;
dm[12] = eye.getX();
dm[13] = eye.getY();
dm[14] = eye.getZ();
dm[15] = 1.f;
// Push it onto the matrix stack
gl.glMultMatrixd(dm, 0);
}
