// pitch camera up or down
private void turnPitch(double pitch) {
Vec3 oldup = new Vec3(up.x, up.y, up.z);
up.x -= Math.tan(pitch) * persp.x;
up.y -= Math.tan(pitch) * persp.y;
up.z -= Math.tan(pitch) * persp.z;
persp.x += Math.tan(pitch) * oldup.x;
persp.y += Math.tan(pitch) * oldup.y;
persp.z += Math.tan(pitch) * oldup.z;
up = up.normalize();
persp = persp.normalize();
}
// turn the camera in its current plane
private void turnYaw(double roll) {
// Up cross focus for left vector
Vec3 left = persp.cross(up);
// Normalize left vector
left = left.normalize();
// Move up vector
persp.x += (Math.tan(roll) * left.x);
persp.y += (Math.tan(roll) * left.y);
persp.z += (Math.tan(roll) * left.z);
// Normalize persp vector
persp = persp.normalize();
}