CylinderCollisionShapes for tree-like objects

Troubleshooting General Help
1

Hi All,

I´m having trouble getting CylinderCollisionShape to work.
I thought it was an apropriate collision shape to add to trees like this

[java]CylinderCollisionShape treeShape = new CylinderCollisionShape(new Vector3f(5f, 15f, 5f), 1);
RigidBodyControl treeBody = new RigidBodyControl(treeShape, 0);
tree.addControl(treeBody);
bulletAppState.getPhysicsSpace().add(tree);[/java]

but the collision shape does not overlap with the trunk of the tree (but apparently a bit in front of it)… the problem i think, is that I don´t now how to deal with halfExtends or the axis… is there some more information about how to do this properly?

thanks

2

Ok! so it’s fixed, my shapes collide nicely with my trees (which turned out to have a faulty mesh)… but i’d stull like to know more about the halfextends system, for instance, what does vector i’m giving the collision shape represent?

3

From the javadoc

[java] /**
* Creates a cylinder shape around the given axis from the given halfextents
* @param halfExtents the halfextents to use
* @param axis (0=X,1=Y,2=Z)
*/ [/java]

So an axis of 1, points upwards in the Y direction. And then the width/height/depth is given as halfExtents * 2

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