chore: add more comments

src/geometry/mesh_converter.rs

@@ -1,6 +1,8 @@
 use parry::bounding_volume;
-use parry::math::{Isometry, Point, Real, DIM};
+use parry::math::{Isometry, Point, Real};
 use parry::shape::{Cuboid, SharedShape, TriMeshFlags};
+
+#[cfg(feature = "dim3")]
 use parry::transformation::vhacd::VHACDParameters;
 
 /*
@@ -9,8 +11,10 @@ use parry::transformation::vhacd::VHACDParameters;
  *
  */
 
+/// Error that can be generated by the [`MeshConverter`].
 #[derive(thiserror::Error, Debug)]
 pub enum MeshConverterError {
+    /// The convex hull calculation carried out by the [`MeshConverter::ConvexHull`] failed.
     #[error("convex-hull computation failed")]
     ConvexHullFailed,
 }
@@ -47,6 +51,8 @@ pub enum MeshConverter {
 }
 
 impl MeshConverter {
+    /// Applies the conversion rule described by this [`MeshConverter`] to build a shape from
+    /// the given vertex and index buffers.
     pub fn convert(
         &self,
         vertices: Vec<Point<Real>>,