How does Blitz3D choose bone weightings?

I have animation implemented, but when loading .b3d files, I have a few problematic vertices in a model with multiple bone weightings. I chose the strongest bone weight, but that does not seem to work perfectly. I was wondering if Blitz3D did anything else besides just pick the bone with the strongest weight, like if a vertex was split equally between two bones?

Blitz applies multiple weights to each vertex, up to 4. So the vertex isn't attached to any one bone, it is influenced by multiple bones simultaneously.

I thought that the .b3d file format supported multiple weightings, but Blitz3D itself only rendered with one bone per vertex.

Hmmm, I guess weights got added at some point:
http://blitzmax.com/Community/posts.php?topic=30872#331163

That's why it looks different.

Okay, I will add that in. I thought maybe I could get away without weightings, but I guess not.