# Orbiting around a point

I use the following function to orbit around the center or a predefined point.

[java]

public void orbitUp(Vector3f camLookAt, float tpf) {

Quaternion tempQuat = new Quaternion();

Quaternion camRot = new Quaternion();

Vector3f camPos = cam.getLocation();

if(camPos.x == 0.0 && camPos.y == 0.0)

{

logger.info(“Orbitting request denied - can’t orbit aorund center”);

}

else {

tempQuat.fromAngles(0, 0, tpf + 0.01f).multLocal(camPos);

camRot.lookAt(camLookAt.subtract(camPos), new Vector3f(Vector3f.UNIT_Z));

cam.setRotation(camRot);

}

}

[/java]

How can I orbit around where the Camera is pointing at?

2 Likes
@Sploreg said:
http://bit.ly/IoDzPA

That's a nice usage of bit.ly :D
@nightwolf911 said:
How can I orbit around where the Camera is pointing at?

Which "where the camera is pointing at"? The camera is "pointing at" an infinite number of points.

I want to be able to point at a location and rotate around it (orbit) rather than orbit around a given point (center in my example set at (0,0,0) every time.

Use a chase cam.

You need to pick a point in space that you want to rotate around. Maybe its where your camera is looking at the ground? Cast a ray in the direction of your camera and find the point of collision with what you want to rotate around.

1 Like
@nightwolf911 said:

I want to be able to point at a location and rotate around it (orbit) rather than orbit around a given point (center in my example set at (0,0,0) every time.

What is the difference between "location" and "point" in the above sentence?

"point at a location and rotate around it"
"orbit around a given point"

Sound identical to me. https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:math_for_dummies

1 Like

+1