Hi Ole,
I was under the impressed that there was a function in the API to call
in order to perform these transformations. In the meantime I did
something similar to your code.
My VRML-Worls contain several shapes which represent a sinlge Object. I
interate through all shapes and geometries in it and calculate the
minimum and maximum coordinates. Then I am able to resize and translate
that properly.
Best Regards,
Andreas
------------- class BranchGroupNormalizer.java
import javax.vecmath.Vector3f;
import javax.vecmath.Point3d;
import javax.media.j3d.*;
class BranchGroupNormalizer extends TransformGroup {
private javax.media.j3d.BranchGroup bg;
public BranchGroupNormalizer(BranchGroup aBG) {
super();
bg = aBG;
updateTransform();
}
private void updateTransform() {
Point3d min = new Point3d();
Point3d max = new Point3d();
Point3d point = new Point3d();
Shape3D aShape3D;
for (int i = 0; i < bg.numChildren(); i++){
Geometry geom;
GeometryArray ga;
try {
aShape3D = (Shape3D)bg.getChild(i);
} catch (ClassCastException cce) {
// Node was not a Shape3D
continue;
}
for (int j = 0; j < aShape3D.numGeometries(); j++) {
geom = aShape3D.getGeometry(j);
if (geom instanceof GeometryArray) {
ga = (GeometryArray)geom;
int num = ga.getVertexCount();
for (int k = 0 ; k < num ; k++ )
{
ga.getCoordinate(k, point);
if (point.x < min.x) {
min.x = point.x;
} else if (point.x > max.x) {
max.x = point.x;
}
if (point.y < min.y) {
min.y = point.y;
} else if (point.y > max.y) {
max.y = point.y;
}
if (point.z < min.z) {
min.z = point.z;
} else if (point.z > max.z) {
max.z = point.z;
}
}
}
}
}
Transform3D back2Origin = new Transform3D();
back2Origin.setTranslation(
new Vector3f( -(float)(0.5*(max.x+min.x)),
-(float)(0.5*(max.y+min.y)),
-(float)(0.5*(max.z+min.z))));
Transform3D scale2UnitCube = new Transform3D();
scale2UnitCube.setScale(2/Math.max(
max.x-min.x,
Math.max(max.y-min.y, max.z-min.z)));
scale2UnitCube.mul(back2Origin);
setTransform(scale2UnitCube);
}
}
------------- How to use it (snippet from HelloUniverse.java
VrmlLoader vrmlLoader = new VrmlLoader();
try {
Scene aScene = vrmlLoader.load("Arbeitsplatz.wrl");
BranchGroupNormalizer bgn = new
BranchGroupNormalizer(aScene.getSceneGroup());
bgn.addChild(aScene.getSceneGroup());
objTrans.addChild(bgn);
} catch (Exception e) {
System.out.println(e);
}
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