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use crate::math::Vect;
use rapier::parry::shape::{TopologyError, TriMesh, TriMeshFlags};
/// Read-only access to the properties of a triangle mesh.
#[derive(Copy, Clone)]
pub struct TriMeshView<'a> {
/// The raw shape from Rapier.
pub raw: &'a TriMesh,
}
macro_rules! impl_ref_methods(
($View: ident) => {
impl<'a> $View<'a> {
/// The number of triangles forming this mesh.
pub fn num_triangles(&self) -> usize {
self.raw.num_triangles()
}
/// An iterator through all the triangles of this mesh.
pub fn triangles(&self) -> impl ExactSizeIterator<Item = (Vect, Vect, Vect)> + '_ {
self.raw
.triangles()
.map(|tri| (tri.a.into(), tri.b.into(), tri.c.into()))
}
/// Get the `i`-th triangle of this mesh.
pub fn triangle(&self, i: u32) -> (Vect, Vect, Vect) {
let tri = self.raw.triangle(i);
(tri.a.into(), tri.b.into(), tri.c.into())
}
/// The vertex buffer of this mesh.
pub fn vertices(&self) -> impl ExactSizeIterator<Item = Vect> + '_ {
self.raw.vertices().iter().map(|pt| (*pt).into())
}
/// The index buffer of this mesh.
pub fn indices(&self) -> &[[u32; 3]] {
self.raw.indices()
}
/// A flat view of the index buffer of this mesh.
pub fn flat_indices(&self) -> &[u32] {
self.raw.flat_indices()
}
}
}
);
impl_ref_methods!(TriMeshView);
/// Read-write access to the properties of a triangle mesh.
pub struct TriMeshViewMut<'a> {
/// The raw shape from Rapier.
pub raw: &'a mut TriMesh,
}
impl_ref_methods!(TriMeshViewMut);
impl<'a> TriMeshViewMut<'a> {
/// Sets the flags of this triangle mesh, controlling its optional associated data.
pub fn set_flags(&mut self, flags: TriMeshFlags) -> Result<(), TopologyError> {
self.raw.set_flags(flags)
}
}