Generating Triangle Mesh Shape from .bam model

Scripting Issues
1

Hello there,

I am trying to generate a BulletTriangleMeshShape from a .bam model file by using the following lines:

modelNP = loader.loadModel('path_to_model')
geom = modelNP.findAllMatches('**/+GeomNode').getPath(0).node().getGeom(0)
mesh = BulletTriangleMesh()
shape = BulletTriangleMeshShape(mesh, dynamic=False)

and then adding the shape to a BulletRigidBodyNode. When using a sample .egg file it works fine, however when I try to use a .bam file, the TriangleMesh does not match the model at all (I just get a large sphere enclosing my visual model).
In the C++ API reference of the GeomNode class i found several functions concerning the BamReader (i.e register_with_read_factory()), but the Python API reference of the GeomNode class does not mention .bam files at all.

Does the code snippet above not work with .bam files in general, did I do something wrong or is there another way of generating colllision shapes from .bam files?

Thanks a lot in advance!

2

Hi, welcome to the forums!

There is nothing in particular that should be different about .bam files in this case (which is why the documentation doesn’t mention it; GeomNodes loaded from a .bam file are not different in some important way).

What I note, though, is that you are only passing in the first Geom of the first GeomNode that it can find. Perhaps that just so happens to be a different one than the one you want, for the .bam file in question, and there are multiple Geoms in the model? Try calling modelNP.ls() and modelNP.analyze() to see what’s inside.

3

Try to combine the geometry, it will also reset the transformation.

modelNP.flattenStrong()
4

Note that even flattenStrong is not guaranteed to result in a single Geom object.

5

Sorry, I made a mistake, use:

 modelNP.flattenLight()

after loading and transformation to bake the geometry.

6

Thanks a lot, this worked perfectly!