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Document possible Ghost Collisions on Collider::trimesh_from_mesh #931

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Document possible Ghost Collisions on Collider::trimesh_from_mesh #931

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Document possible Ghost Collisions on the `Collider::trimesh_from_mes…
faervan Jan 27, 2026
4e5ddb7
Mention possible failure of `FIX_INTERNAL_EDGES`
faervan Jan 28, 2026
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16 changes: 16 additions & 0 deletions src/collision/collider/parry/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1187,6 +1187,14 @@ impl Collider {
/// The [`CollisionMargin`] component can be used to add thickness to the shape if needed.
/// For thin shapes like triangle meshes, it can help improve collision stability and performance.
///
/// When encountering issues with
/// [Ghost Collisions](https://box2d.org/posts/2020/06/ghost-collisions/) where bodies collide
/// with the internal edges of the trimesh, try setting the flag
/// [`TrimeshFlags::FIX_INTERNAL_EDGES`] via [`Self::trimesh_from_mesh_with_config`], which
/// should fix the issue for edges where none of the adjacent triangles border their neighbor
/// triangles convexly (with an angle less than 180°). Note that this will also not fix the
/// issues with boundary edges between two different colliders.
///
/// # Example
///
/// ```
Expand Down Expand Up @@ -1223,6 +1231,14 @@ impl Collider {
/// The [`CollisionMargin`] component can be used to add thickness to the shape if needed.
/// For thin shapes like triangle meshes, it can help improve collision stability and performance.
///
/// When encountering issues with
/// [Ghost Collisions](https://box2d.org/posts/2020/06/ghost-collisions/) where bodies collide
/// with the internal edges of the trimesh, try setting the flag
/// [`TrimeshFlags::FIX_INTERNAL_EDGES`], which should fix the issue for edges where none of
/// the adjacent triangles border their neighbor triangles convexly (with an angle less than
/// 180°). Note that this will also not fix the issues with boundary edges between two different
/// colliders.
///
/// # Example
///
/// ```
Expand Down
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