The [i]Concept[/i] of Animation in 3D

Troubleshooting General Help
1

Hi,

I’ve been reading the tutorials on animation for jMe and I noticed that all of them use a transformer of some type for another. Is this the common way of doing animation in jMe?



In 2D, I could easily specify acceleration and velocity and the likes by implementing them myself


long currentTime = System.currentTimeMillis();
while(true)
{
  int timePassed = System.currentTimeMillis()-currentTime;
  currentTime = System.currentTimeMillis();
  updatePosition(timePassed);
  paint(getGraphics());
}


But how would you do these complex animations in jMe, acceleration and velocity need to be accurate. I can't imagine doing this using SpatialTransfomer?
2

You have free reign to position nodes by hand if you need accuracy that controllers don’t give you. Just setLocalTranslation, setLocalRotation, setLocalScale. Those three methods will let you position a node anywhere at any orientation.

3

Is there a method that I can put that in? Like a method that’s called before every paint?



I want to achieve a perfect - update , paint, update, paint, update, paint, etc… synchronization.

4

simpleUpdate is called before every paint and simpleRender is called during every paint. Read through the tutorial about SimpleGame.

5

The abstract game loop is:


while (!finished && !display.isClosing()) {
        //update game state, do not use interpolation parameter
        update( -1.0f);

        //render, do not use interpolation parameter
        render( -1.0f);

        //swap buffers
        display.getRenderer().displayBackBuffer();
      }



So, if you are using anything other than SimpleGame use the update method, if you ARE using SimpleGame override

protected void simpleUpdate()
6

That’s perfect. That’s exactly what I needed.

Thx