How to adjust somthing to the ground

Troubleshooting General Help
1

if i simply do this:

public void rotateUpToTerrainNormal()
  {

    //noinspection ConstantConditions
    final Vector3f l_up = ms_core.getTerrain().getSurfaceNormal(getWorldCenter(), ms_tmp);
    if (l_up != null)
    {
      rotateUpTo(l_up);
      afterMove();
    }
  }



my object, in my case a spider, has the correct angle, but floats a bit above the ground. i guess it's rotated around its center, but that's wrong - it has to be rotated around the center where it touches the terrain, or change the up vector and move it "downwards" by the right distance. how can i do that?


2

does jme's built in rotate to normal method have the same effect, its demonstrated in flagrush 7 or 8 and a couple other tests I think

3

Have you checked in a modelling program if the center of rotation (pivot) is correctly placed for the spider?

4

wild guess:

the first rotiation is correct, then the bounding box is modified, gets bigger, and then the model is moved upwards…

have to think about that

5

Oriented bounding box?

6

doesn't matter, right now the hhexen engine assumes the lowest point to be the one that must be moved upwards until it matches the terrain height at below the nodes center

7

Then that would be your problem… The lowest point after rotation does not correspond with your lowest point before rotation. Am I missing something?



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