Inacurrate collisions for CreateCapsule + Ammo CapsuleImpostor

Questions
1

When using MeshBuilder.CreateCapsule and CapsuleImpostor, if the total height is set too high (I think over twice the sphere diameter), collisions will be inaccurate. Using Compound impostors seems good for all heights

Height of Capsules: 2 (Good collisions):

Playground: https://www.babylonjs-playground.com/#3EDS3A#489

Screenshot (1788)
Screenshot (1788)1270×1045 122 KB

Height of Capsules: 4 (Inaccurate collisions, bottom and top spheres intersect other impostors):

Playground: https://www.babylonjs-playground.com/#3EDS3A#490

Screenshot (1787)
Screenshot (1787)1267×1045 166 KB

Was wondering if anyone had run into this before? Thank you for your help!

For your reference, the height of the CreateCapsule is defined in:

const capsule = BABYLON.Mesh.CreateCapsule('', {
    subdivisions: 2,
    tessellation: 16,
    height: 2,
    radius: 0.5,
    capSubdivisions: 6
}, scene);
2

Pinging @Cedric

1 Like
3

Hi @gbz

Yep, looks like we have a problem here. I think the issue is when computing the impostor size from the source mesh…investigating…

1 Like
4

Thank you so much for your time and help :slight_smile:

1 Like
5

PR Fix capsule impostor size computation for ammojs by CedricGuillemet · Pull Request #9745 · BabylonJS/Babylon.js · GitHub

1 Like