Use meshloader to support multiple file formats loading (#744)

Co-authored-by: Tin Lai <tin@tinyiu.com>

14 files changed, 214 insertions, 189 deletions

diff --git a/.github/workflows/rapier-ci-build.yml b/.github/workflows/rapier-ci-build.yml
index e978550..8603f1d 100644
--- a/.github/workflows/rapier-ci-build.yml
+++ b/.github/workflows/rapier-ci-build.yml
@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Cargo doc
-        run: cargo doc --features parallel,simd-stable,serde-serialize,debug-render -p rapier3d -p rapier2d -p rapier3d-stl -p rapier3d-urdf
+        run: cargo doc --features parallel,simd-stable,serde-serialize,debug-render -p rapier3d -p rapier2d -p rapier3d-meshloader -p rapier3d-urdf
   build-native:
     runs-on: ubuntu-latest
     env:
diff --git a/Cargo.toml b/Cargo.toml
index 4797798..8d9b1b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ members = [
     "examples3d-f64",
     "benchmarks3d",
     "crates/rapier3d-urdf",
-    "crates/rapier3d-stl",
+    "crates/rapier3d-meshloader",
 ]
 resolver = "2"
 
diff --git a/crates/rapier3d-meshloader/CHANGELOG.md b/crates/rapier3d-meshloader/CHANGELOG.md
new file mode 100644
index 0000000..0663078
--- /dev/null
+++ b/crates/rapier3d-meshloader/CHANGELOG.md
@@ -0,0 +1,22 @@
+## Unreleased
+
+Renamed the crate from `rapier3d-stl` to `rapier3d-meshloader`, to better reflect its support for multiple formats.
+
+### Added
+
+- Add optional support for Collada and Wavefront files through new feature flags `collada` and `wavefront`.
+
+### Modified
+
+- Support for STL is now optional through feature `stl`.
+- Features `stl`, `wavefront` and `collada` are enabled by default.
+
+## 0.3.0
+
+This is the initial release of the `rapier3d-stl` crate.
+
+### Added
+
+- Add `load_from_path` for creating a shape from a stl file.
+- Add `load_from_reader` for creating a shape from an object implementing `Read`.
+- Add `load_from_raw_mesh` for creating a shape from an already loaded `IndexedMesh`.
diff --git a/crates/rapier3d-stl/Cargo.toml b/crates/rapier3d-meshloader/Cargo.toml
index f24f102..a470afc 100644
--- a/crates/rapier3d-stl/Cargo.toml
+++ b/crates/rapier3d-meshloader/Cargo.toml
@@ -1,19 +1,31 @@
 [package]
-name = "rapier3d-stl"
+name = "rapier3d-meshloader"
 version = "0.3.0"
 authors = ["Sébastien Crozet <sebcrozet@dimforge.com>"]
 description = "STL file loader for the 3D rapier physics engine."
-documentation = "https://docs.rs/rapier3d-stl"
+documentation = "https://docs.rs/rapier3d-meshloader"
 homepage = "https://rapier.rs"
 repository = "https://github.com/dimforge/rapier"
 readme = "README.md"
-categories = ["science", "game-development", "mathematics", "simulation", "wasm"]
+categories = [
+    "science",
+    "game-development",
+    "mathematics",
+    "simulation",
+    "wasm",
+]
 keywords = ["physics", "joints", "multibody", "robotics", "urdf"]
 license = "Apache-2.0"
 edition = "2021"
 
+[features]
+default = ["stl", "collada", "wavefront"]
+stl = ["mesh-loader/stl"]
+collada = ["mesh-loader/collada"]
+wavefront = ["mesh-loader/obj"]
+
 [dependencies]
 thiserror = "1.0.61"
-stl_io = "0.7"
+mesh-loader = { version = "0.1.12", optional = true }
 
 rapier3d = { version = "0.22", path = "../rapier3d" }
diff --git a/crates/rapier3d-stl/LICENSE b/crates/rapier3d-meshloader/LICENSE
index 97f4383..97f4383 100644
--- a/crates/rapier3d-stl/LICENSE
+++ b/crates/rapier3d-meshloader/LICENSE
diff --git a/crates/rapier3d-stl/README.md b/crates/rapier3d-meshloader/README.md
index 98d61a0..003a7fa 100644
--- a/crates/rapier3d-stl/README.md
+++ b/crates/rapier3d-meshloader/README.md
@@ -1,8 +1,12 @@
-## STL loader for the Rapier physics engine
+## Mesh loader for the Rapier physics engine
 
-Rapier is a set of 2D and 3D physics engines for games, animation, and robotics. The `rapier3d-stl`
+Rapier is a set of 2D and 3D physics engines for games, animation, and robotics. The `rapier3d-meshloader`
 crate lets you create a shape compatible with `rapier3d` and `parry3d` (the underlying collision-detection
-library) from an STL file.
+library) from different file formats, see the following features list:
+
+- `stl`: support .stl files
+- `collada`: support .dae files
+- `wavefront`: support .obj files
 
 ## Resources and discussions
 
diff --git a/crates/rapier3d-meshloader/src/lib.rs b/crates/rapier3d-meshloader/src/lib.rs
new file mode 100644
index 0000000..32051e5
--- /dev/null
+++ b/crates/rapier3d-meshloader/src/lib.rs
@@ -0,0 +1,86 @@
+#![doc = include_str!("../README.md")]
+#![deny(missing_docs)]
+
+use mesh_loader::Mesh;
+use rapier3d::geometry::{MeshConverter, SharedShape};
+use rapier3d::math::{Isometry, Point, Real, Vector};
+use rapier3d::prelude::MeshConverterError;
+use std::path::Path;
+
+/// The result of loading a shape.
+pub struct LoadedShape {
+    /// The shape loaded from the file and converted by the [`MeshConverter`].
+    pub shape: SharedShape,
+    /// The shape’s pose.
+    pub pose: Isometry<Real>,
+    /// The raw mesh read from the file without any modification.
+    pub raw_mesh: Mesh,
+}
+
+/// Error while loading an STL file.
+#[derive(thiserror::Error, Debug)]
+pub enum MeshLoaderError {
+    /// An error triggered by rapier’s [`MeshConverter`].
+    #[error(transparent)]
+    MeshConverter(#[from] MeshConverterError),
+    /// A generic IO error.
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+}
+
+/// Loads parry shapes from a file.
+///
+/// # Parameters
+/// - `path`: the file’s path.
+/// - `converter`: controls how the shapes are computed from the content. In particular, it lets
+///                you specify if the computed [`SharedShape`] is a triangle mesh, its convex hull,
+///                bounding box, etc.
+/// - `scale`: the scaling factor applied to the geometry input to the `converter`. This scale will
+///            affect at the geometric level the [`LoadedShape::shape`]. Note that raw mesh value stored
+///            in [`LoadedShape::raw_mesh`] remains unscaled.
+pub fn load_from_path(
+    path: impl AsRef<Path>,
+    converter: &MeshConverter,
+    scale: Vector<Real>,
+) -> Result<Vec<Result<LoadedShape, MeshConverterError>>, MeshLoaderError> {
+    let loader = mesh_loader::Loader::default();
+    let mut colliders = vec![];
+    let scene = loader.load(path)?;
+    for (raw_mesh, _) in scene.meshes.into_iter().zip(scene.materials) {
+        let shape = load_from_raw_mesh(&raw_mesh, converter, scale);
+
+        colliders.push(shape.map(|(shape, pose)| LoadedShape {
+            shape,
+            pose,
+            raw_mesh,
+        }));
+    }
+    Ok(colliders)
+}
+
+/// Loads an file as a shape from a preloaded raw [`mesh_loader::Mesh`].
+///
+/// # Parameters
+/// - `raw_mesh`: the raw mesh.
+/// - `converter`: controls how the shape is computed from the STL content. In particular, it lets
+///                you specify if the computed [`SharedShape`] is a triangle mesh, its convex hull,
+///                bounding box, etc.
+/// - `scale`: the scaling factor applied to the geometry input to the `converter`. This scale will
+///            affect at the geometric level the [`LoadedShape::shape`]. Note that raw mesh value stored
+///            in [`LoadedShape::raw_mesh`] remains unscaled.
+pub fn load_from_raw_mesh(
+    raw_mesh: &Mesh,
+    converter: &MeshConverter,
+    scale: Vector<Real>,
+) -> Result<(SharedShape, Isometry<Real>), MeshConverterError> {
+    let mut vertices: Vec<_> = raw_mesh
+        .vertices
+        .iter()
+        .map(|xyz| Point::new(xyz[0], xyz[1], xyz[2]))
+        .collect();
+    vertices
+        .iter_mut()
+        .for_each(|pt| pt.coords.component_mul_assign(&scale));
+    let indices: Vec<_> = raw_mesh.faces.clone();
+    converter.convert(vertices, indices)
+}
diff --git a/crates/rapier3d-stl/CHANGELOG.md b/crates/rapier3d-stl/CHANGELOG.md
deleted file mode 100644
index bb3ffa3..0000000
--- a/crates/rapier3d-stl/CHANGELOG.md
+++ /dev/null
@@ -1,9 +0,0 @@
-## Unreleased
-
-This is the initial release of the `rapier3d-stl` crate.
-
-### Added
-
-- Add `load_from_path` for creating a shape from a stl file.
-- Add `load_from_reader` for creating a shape from an object implementing `Read`.
-- Add `load_from_raw_mesh` for creating a shape from an already loaded `IndexedMesh`.
diff --git a/crates/rapier3d-stl/src/lib.rs b/crates/rapier3d-stl/src/lib.rs
deleted file mode 100644
index 7b22e74..0000000
--- a/crates/rapier3d-stl/src/lib.rs
+++ /dev/null
@@ -1,110 +0,0 @@
-//! ## STL loader for the Rapier physics engine
-//!
-//! Rapier is a set of 2D and 3D physics engines for games, animation, and robotics. The `rapier3d-stl`
-//! crate lets you create a shape compatible with `rapier3d` and `parry3d` (the underlying collision-detection
-//! library) from an STL file.
-
-#![warn(missing_docs)]
-
-use rapier3d::geometry::{MeshConverter, MeshConverterError, SharedShape};
-use rapier3d::math::{Isometry, Point, Real, Vector};
-use std::fs::File;
-use std::io::{BufReader, Read, Seek};
-use std::path::Path;
-use stl_io::IndexedMesh;
-
-/// Error while loading an STL file.
-#[derive(thiserror::Error, Debug)]
-pub enum StlLoaderError {
-    /// An error triggered by rapier’s [`MeshConverter`].
-    #[error(transparent)]
-    MeshConverter(#[from] MeshConverterError),
-    /// A generic IO error.
-    #[error(transparent)]
-    Io(#[from] std::io::Error),
-}
-
-/// The result of loading a shape from an stl mesh.
-pub struct StlShape {
-    /// The shape loaded from the file and converted by the [`MeshConverter`].
-    pub shape: SharedShape,
-    /// The shape’s pose.
-    pub pose: Isometry<Real>,
-    /// The raw mesh read from the stl file without any modification.
-    pub raw_mesh: IndexedMesh,
-}
-
-/// Loads an STL file as a shape from a file.
-///
-/// # Parameters
-/// - `file_path`: the STL file’s path.
-/// - `converter`: controls how the shape is computed from the STL content. In particular, it lets
-///                you specify if the computed [`StlShape::shape`] is a triangle mesh, its convex hull,
-///                bounding box, etc.
-/// - `scale`: the scaling factor applied to the geometry input to the `converter`. This scale will
-///            affect at the geometric level the [`StlShape::shape`]. Note that raw mesh value stored
-///            in [`StlShape::raw_mesh`] remains unscaled.
-pub fn load_from_path(
-    file_path: impl AsRef<Path>,
-    converter: MeshConverter,
-    scale: Vector<Real>,
-) -> Result<StlShape, StlLoaderError> {
-    let mut reader = BufReader::new(File::open(file_path)?);
-    load_from_reader(&mut reader, converter, scale)
-}
-
-/// Loads an STL file as a shape from an arbitrary reader.
-///
-/// # Parameters
-/// - `reader`: the reader.
-/// - `converter`: controls how the shape is computed from the STL content. In particular, it lets
-///                you specify if the computed [`StlShape::shape`] is a triangle mesh, its convex hull,
-///                bounding box, etc.
-/// - `scale`: the scaling factor applied to the geometry input to the `converter`. This scale will
-///            affect at the geometric level the [`StlShape::shape`]. Note that raw mesh value stored
-///            in [`StlShape::raw_mesh`] remains unscaled.
-pub fn load_from_reader<R: Read + Seek>(
-    read: &mut R,
-    converter: MeshConverter,
-    scale: Vector<Real>,
-) -> Result<StlShape, StlLoaderError> {
-    let stl_mesh = stl_io::read_stl(read)?;
-    Ok(load_from_raw_mesh(stl_mesh, converter, scale)?)
-}
-
-/// Loads an STL file as a shape from a preloaded raw stl mesh.
-///
-/// # Parameters
-/// - `raw_mesh`: the raw stl mesh.
-/// - `converter`: controls how the shape is computed from the STL content. In particular, it lets
-///                you specify if the computed [`StlShape::shape`] is a triangle mesh, its convex hull,
-///                bounding box, etc.
-/// - `scale`: the scaling factor applied to the geometry input to the `converter`. This scale will
-///            affect at the geometric level the [`StlShape::shape`]. Note that raw mesh value stored
-///            in [`StlShape::raw_mesh`] remains unscaled.
-pub fn load_from_raw_mesh(
-    raw_mesh: IndexedMesh,
-    converter: MeshConverter,
-    scale: Vector<Real>,
-) -> Result<StlShape, MeshConverterError> {
-    let mut vertices: Vec<_> = raw_mesh
-        .vertices
-        .iter()
-        .map(|xyz| Point::new(xyz[0], xyz[1], xyz[2]))
-        .collect();
-    vertices
-        .iter_mut()
-        .for_each(|pt| pt.coords.component_mul_assign(&scale));
-    let indices: Vec<_> = raw_mesh
-        .faces
-        .iter()
-        .map(|f| f.vertices.map(|i| i as u32))
-        .collect();
-    let (shape, pose) = converter.convert(vertices, indices)?;
-
-    Ok(StlShape {
-        shape,
-        pose,
-        raw_mesh,
-    })
-}
diff --git a/crates/rapier3d-urdf/CHANGELOG.md b/crates/rapier3d-urdf/CHANGELOG.md
index 852e45a..5284d9c 100644
--- a/crates/rapier3d-urdf/CHANGELOG.md
+++ b/crates/rapier3d-urdf/CHANGELOG.md
@@ -1,5 +1,11 @@
 ## Unreleased
 
+### Added
+
+- Add optional support for Collada and Wavefront files through new feature flags `collada` and `wavefront`.
+
+## 0.3.0
+
 This is the initial release of the `rapier3d-urdf` crate.
 
 ### Added
diff --git a/crates/rapier3d-urdf/Cargo.toml b/crates/rapier3d-urdf/Cargo.toml
index ef53da9..d6f74c9 100644
--- a/crates/rapier3d-urdf/Cargo.toml
+++ b/crates/rapier3d-urdf/Cargo.toml
@@ -7,13 +7,21 @@ documentation = "https://docs.rs/rapier3d-urdf"
 homepage = "https://rapier.rs"
 repository = "https://github.com/dimforge/rapier"
 readme = "README.md"
-categories = ["science", "game-development", "mathematics", "simulation", "wasm"]
+categories = [
+    "science",
+    "game-development",
+    "mathematics",
+    "simulation",
+    "wasm",
+]
 keywords = ["physics", "joints", "multibody", "robotics", "urdf"]
 license = "Apache-2.0"
 edition = "2021"
 
 [features]
-stl = ["dep:rapier3d-stl"]
+stl = ["dep:rapier3d-meshloader", "rapier3d-meshloader/stl"]
+collada = ["dep:rapier3d-meshloader", "rapier3d-meshloader/collada"]
+wavefront = ["dep:rapier3d-meshloader", "rapier3d-meshloader/wavefront"]
 
 [dependencies]
 log = "0.4"
@@ -23,4 +31,4 @@ bitflags = "2"
 xurdf = "0.2"
 
 rapier3d = { version = "0.22", path = "../rapier3d" }
-rapier3d-stl = { version = "0.3.0", path = "../rapier3d-stl", optional = true }
+rapier3d-meshloader = { version = "0.3.0", path = "../rapier3d-meshloader", default-features = false, optional = true }
diff --git a/crates/rapier3d-urdf/README.md b/crates/rapier3d-urdf/README.md
index ae2e21d..48b399c 100644
--- a/crates/rapier3d-urdf/README.md
+++ b/crates/rapier3d-urdf/README.md
@@ -1,4 +1,4 @@
-## STL loader for the Rapier physics engine
+## Mesh loader for the Rapier physics engine
 
 Rapier is a set of 2D and 3D physics engines for games, animation, and robotics. The `rapier3d-urdf`
 crate lets you convert an URDF file into a set of rigid-bodies, colliders, and joints, for usage with the
@@ -6,7 +6,9 @@ crate lets you convert an URDF file into a set of rigid-bodies, colliders, and j
 
 ## Optional cargo features
 
-- `stl`: enables loading STL meshes referenced by the URDF file.
+- `stl`: enables loading `.STL` meshes referenced by the URDF file.
+- `collada`: enables loading `.dae` meshes referenced by the URDF file.
+- `wavefront`: enables loading `.obj` meshes referenced by the URDF file.
 
 ## Limitations
 
@@ -14,7 +16,7 @@ Are listed below some known limitations you might want to be aware of before pic
 improve
 these elements are very welcome!
 
-- Mesh file types other than `stl` are not supported yet. Contributions are welcome. You my check the `rapier3d-stl`
+- Supported mesh formats are `stl`, `collada` and `wavefront`. Contributions are welcome. You my check the `rapier3d-meshloader`
   repository for an example of mesh loader.
 - When inserting joints as multibody joints, they will be reset to their neutral position (all coordinates = 0).
 - The following fields are currently ignored:
diff --git a/crates/rapier3d-urdf/src/lib.rs b/crates/rapier3d-urdf/src/lib.rs
index 1f913da..8e858c3 100644
--- a/crates/rapier3d-urdf/src/lib.rs
+++ b/crates/rapier3d-urdf/src/lib.rs
@@ -1,4 +1,4 @@
-//! ## STL loader for the Rapier physics engine
+//! ## URDF loader for the Rapier physics engine
 //!
 //! Rapier is a set of 2D and 3D physics engines for games, animation, and robotics. The `rapier3d-urdf`
 //! crate lets you convert an URDF file into a set of rigid-bodies, colliders, and joints, for usage with the
@@ -7,6 +7,8 @@
 //! ## Optional cargo features
 //!
 //! - `stl`: enables loading STL meshes referenced by the URDF file.
+//! - `collada`: enables loading Collada (`.dae`) meshes referenced by the URDF file.
+//! - `wavefront`: enables loading Wavefront (`.obj`) meshes referenced by the URDF file.
 //!
 //! ## Limitations
 //!
@@ -14,7 +16,7 @@
 //! improve
 //! these elements are very welcome!
 //!
-//! - Mesh file types other than `stl` are not supported yet. Contributions are welcome. You my check the `rapier3d-stl`
+//! - Mesh file types are limited. Contributions are welcome. You may check the `rapier3d-meshloader`
 //!   repository for an example of mesh loader.
 //! - When inserting joints as multibody joints, they will be reset to their neutral position (all coordinates = 0).
 //! - The following fields are currently ignored:
@@ -35,6 +37,7 @@ use rapier3d::{
     geometry::{Collider, ColliderBuilder, ColliderHandle, ColliderSet, SharedShape, TriMeshFlags},
     math::{Isometry, Point, Real, Vector},
     na,
+    prelude::MeshConverter,
 };
 use std::collections::HashMap;
 use std::path::Path;
@@ -289,7 +292,7 @@ impl UrdfRobot {
     /// (`UrdfRobot`). Both structures are arranged the same way, with matching indices for each part.
     ///
     /// If the URDF file references external meshes, they will be loaded automatically if the format
-    /// is supported. The format is detected from the file’s extension. All the mesh formats are
+    /// is supported. The format is detected mostly from the file’s extension. All the mesh formats are
     /// disabled by default and can be enabled through cargo features (e.g. the `stl` feature of
     /// this crate enabled loading referenced meshes in stl format).
     ///
@@ -310,13 +313,13 @@ impl UrdfRobot {
                 name_to_link_id.insert(&link.name, id);
                 let mut colliders = vec![];
                 if options.create_colliders_from_collision_shapes {
-                    colliders.extend(link.collisions.iter().filter_map(|co| {
-                        urdf_to_collider(&options, mesh_dir, &co.geometry, &co.origin)
+                    colliders.extend(link.collisions.iter().flat_map(|co| {
+                        urdf_to_colliders(&options, mesh_dir, &co.geometry, &co.origin)
                     }))
                 }
                 if options.create_colliders_from_visual_shapes {
-                    colliders.extend(link.visuals.iter().filter_map(|vis| {
-                        urdf_to_collider(&options, mesh_dir, &vis.geometry, &vis.origin)
+                    colliders.extend(link.visuals.iter().flat_map(|vis| {
+                        urdf_to_colliders(&options, mesh_dir, &vis.geometry, &vis.origin)
                     }))
                 }
                 let mut body = urdf_to_rigid_body(&options, &link.inertial);
@@ -488,66 +491,67 @@ fn urdf_to_rigid_body(options: &UrdfLoaderOptions, inertial: &Inertial) -> Rigid
     builder.build()
 }
 
-fn urdf_to_collider(
+fn urdf_to_colliders(
     options: &UrdfLoaderOptions,
-    _mesh_dir: &Path, // NOTO: this isn’t used if there is no external mesh feature enabled (like stl).
+    mesh_dir: &Path,
     geometry: &Geometry,
     origin: &Pose,
-) -> Option<Collider> {
-    let mut builder = options.collider_blueprint.clone();
+) -> Vec<Collider> {
     let mut shape_transform = Isometry::identity();
-    let shape = match &geometry {
-        Geometry::Box { size } => SharedShape::cuboid(
-            size[0] as Real / 2.0,
-            size[1] as Real / 2.0,
-            size[2] as Real / 2.0,
-        ),
+
+    let mut colliders = Vec::new();
+
+    match &geometry {
+        Geometry::Box { size } => {
+            colliders.push(SharedShape::cuboid(
+                size[0] as Real / 2.0,
+                size[1] as Real / 2.0,
+                size[2] as Real / 2.0,
+            ));
+        }
         Geometry::Cylinder { radius, length } => {
             // This rotation will make the cylinder Z-up as per the URDF spec,
             // instead of rapier’s default Y-up.
             shape_transform = Isometry::rotation(Vector::x() * Real::frac_pi_2());
-            SharedShape::cylinder(*length as Real / 2.0, *radius as Real)
+            colliders.push(SharedShape::cylinder(
+                *length as Real / 2.0,
+                *radius as Real,
+            ));
+        }
+        Geometry::Sphere { radius } => {
+            colliders.push(SharedShape::ball(*radius as Real));
         }
-        Geometry::Sphere { radius } => SharedShape::ball(*radius as Real),
         Geometry::Mesh { filename, scale } => {
-            let path: &Path = filename.as_ref();
-            let _scale = scale
+            let full_path = mesh_dir.join(filename);
+            let scale = scale
                 .map(|s| Vector::new(s.x as Real, s.y as Real, s.z as Real))
                 .unwrap_or_else(|| Vector::<Real>::repeat(1.0));
-            match path.extension().and_then(|ext| ext.to_str()) {
-                #[cfg(feature = "stl")]
-                Some("stl") | Some("STL") => {
-                    use rapier3d::geometry::MeshConverter;
-                    let full_path = _mesh_dir.join(filename);
-                    match rapier3d_stl::load_from_path(
-                        full_path,
-                        MeshConverter::TriMeshWithFlags(options.trimesh_flags),
-                        _scale,
-                    ) {
-                        Ok(stl_shape) => {
-                            shape_transform = stl_shape.pose;
-                            stl_shape.shape
-                        }
-                        Err(e) => {
-                            log::error!("failed to load STL file {filename}: {e}");
-                            return None;
-                        }
-                    }
-                }
-                _ => {
-                    log::error!("failed to load file with unknown type {filename}");
-                    return None;
-                }
-            }
+            let Ok(loaded_mesh) = rapier3d_meshloader::load_from_path(
+                full_path,
+                &MeshConverter::TriMeshWithFlags(options.trimesh_flags),
+                scale,
+            ) else {
+                return Vec::new();
+            };
+            colliders.append(
+                &mut loaded_mesh
+                    .into_iter()
+                    .filter_map(|x| x.map(|s| s.shape).ok())
+                    .collect(),
+            );
         }
-    };
+    }
 
-    builder.shape = shape;
-    Some(
-        builder
-            .position(urdf_to_isometry(origin) * shape_transform)
-            .build(),
-    )
+    colliders
+        .drain(..)
+        .map(move |shape| {
+            let mut builder = options.collider_blueprint.clone();
+            builder.shape = shape;
+            builder
+                .position(urdf_to_isometry(origin) * shape_transform)
+                .build()
+        })
+        .collect()
 }
 
 fn urdf_to_isometry(pose: &Pose) -> Isometry<Real> {
diff --git a/scripts/publish-extra-formats.sh b/scripts/publish-extra-formats.sh
index 1d9a990..af48e77 100755
--- a/scripts/publish-extra-formats.sh
+++ b/scripts/publish-extra-formats.sh
@@ -2,8 +2,8 @@
 
 currdir=$(pwd)
 
-### Publish rapier3d-stl.
-cd "crates/rapier3d-stl" && cargo publish $DRY_RUN || exit 1
+### Publish rapier3d-meshloader.
+cd "crates/rapier3d-meshloader" && cargo publish $DRY_RUN || exit 1
 cd "$currdir" || exit 2
 
 ### Publish rapier3d-urdf.