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  Camera - rubberband effect  (Read 808 times)
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Offline rmdire

Junior Devvie

« Posted 2004-10-19 19:21:58 »

Hi All,

Anybody know how to add the Rubberband effect
to a camera.
so that a camera following a moved model will drift to its position behind that model after a short time.


Offline Orangy Tang

JGO Kernel

Medals: 57
Projects: 11

Monkey for a head

« Reply #1 - Posted 2004-10-19 20:30:47 »

A dead easy way to get a smooth drift into position is to get the new position by a weighted avarage of the current position and the target position. Do that every frame with a sufficiently high weight (about 0.98 usually works well) and it'll gently drift into place.

One snag is that this method depends on your framerate. Theres a slightly complex way to make it framerate-independant but I can't remember that off hand (don't usually need it though).

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Offline rmdire

Junior Devvie

« Reply #2 - Posted 2004-10-22 10:19:03 »

Hi - I've tried to implement a weighted average on the view - as follows:

public Vector3f getWeightedDistance(float weighting,Vector3f modelPosition,Vector3f correctDistance,Vector3f cameraPosition)
           float xDistance = 0.0f;
           float yDistance = 0.0f;
           float zDistance = 0.0f;
           float xWeightedDistance=0.0f;
           float yWeightedDistance=0.0f;
           float zWeightedDistance=0.0f;
        xDistance = modelPosition.x-cameraPosition.x;
        yDistance = modelPosition.y-cameraPosition.y;
        zDistance = modelPosition.z-cameraPosition.z;
           xWeightedDistance=(correctDistance.x + xDistance)/2*weighting;
           yWeightedDistance=(correctDistance.y + yDistance)/2*weighting;
           zWeightedDistance=(correctDistance.z + zDistance)/2*weighting;
             xWeightedDistance=(correctDistance.x + xDistance)/2*1.2f;
             yWeightedDistance=(correctDistance.y + yDistance)/2*1.2f;
             zWeightedDistance=(correctDistance.z + zDistance)/2*1.2f;
       return cameraPosition;



and then used View.getTransform.lookAt()

as follows

view.getTransform().lookAt(getWeightedDistance(0.98f,characterControl.getXYZ(),new Vector3f(5.0f,1.0f,5.0f), v), new Vector3f((float)characterControl.getXYZ().x, 1.0f, (float)characterControl.getXYZ().z ),new Vector3f(0, 1, 0));


this seems to work - but how can I apply this to rotating the camera around the model position?

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Offline rmdire

Junior Devvie

« Reply #3 - Posted 2004-10-22 11:58:43 »

*note* - in reference to above code,

the method  :


returns a vector3f of the model current position.

Thanks for your Help

Offline rmdire

Junior Devvie

« Reply #4 - Posted 2004-10-23 08:38:27 »

I found the following link - which appears to do what I want - in c/c++.

If people want it - after I  convert the code , I'll post a Java version.

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