Is collision shape from glb ignored by BJS?

Questions
1

I make some mesh in Blender. Turned on Rigidbody modifier and set “box” as a shape of collisions for that mesh objects. My mesh is not box-shaped but it’s just for a test.
Then I exported it as glb and loaded in BJS. Tested to check its collisions with moveWithCollisions().
To my surprise my box-shaped collider from Blender was ignored. Instead of it I see that now it’s like mesh collision shape or “convex hull”. Looks like BJS creates collisions when it loads the mesh?

So how to create collisions for complex objects?

2

My version is:

const collisions = result.meshes.filter(x => /col_/.test(x.name));

collisions.forEach(collisionItem => {
  collisionItem.checkCollisions = true;
  collisionItem.isVisible = false;
});

here I get all meshes that names starts with “col_” and define them as collisions.

If you use rigidbody probably, add some code to define parent relations, I think.

1 Like
3

And also check this playground with physics impostor Babylon.js Playground

2 Likes
4

If I got your idea right, you create additional meshes for being just collisions for your main meshes and make those collisions-meshes transparent?

5

Correct. I am not a specialist but as I know – this is common way to do this.

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6

AFAIK colliders are not exported as part of a glb export. To be more specific - the meshes might be exported but we don’t set them to be collision-enabled per default. However, @bghgary knows that better and will be able to answer this specific question better than me.

@Dok11 's solution is very straightforward and would be my solution as well.

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