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use crate::math::Real;
use crate::shape::{GenericHeightField, HeightFieldCellStatus, HeightFieldStorage};
use na::Point3;

impl<Heights, Status> GenericHeightField<Heights, Status>
where
    Heights: HeightFieldStorage<Item = Real>,
    Status: HeightFieldStorage<Item = HeightFieldCellStatus>,
{
    /// Discretize the boundary of this ball as a triangle-mesh.
    pub fn to_trimesh(&self) -> (Vec<Point3<Real>>, Vec<[u32; 3]>) {
        let mut vertices = Vec::new();
        let mut indices = Vec::new();

        for (i, tri) in self.triangles().enumerate() {
            vertices.push(tri.a);
            vertices.push(tri.b);
            vertices.push(tri.c);

            let i = i as u32;
            indices.push([i * 3, i * 3 + 1, i * 3 + 2])
        }

        (vertices, indices)
    }
}