Mutating mesh data

[medakk]

What is the correct way to mutate Mesh coords/faces?

Currently, I have:

use kiss3d::resource::Mesh;

pub struct ClothViz {
    mesh: Rc<RefCell<Mesh>>,
}

And a function where I update it:

    pub fn update(&mut self, hookean: &HookeanSurface) {
        let xs = hookean.x(); // This is just a na::DMatrix<f32>

        // Update mesh
        let mesh = self.mesh.borrow();
        let mut coords = mesh.coords().write().unwrap();
        if let Some(data) = coords.data_mut() {
            for (i, p) in data.iter_mut().enumerate() {
                let row = xs.row(i);

                for j in 0..3 {
                    p.coords[j] = row[j];
                }
            }
            coords.load_to_gpu();
        } else {
            panic!("coords not in RAM");
        }
    }

This works, but I'm wondering what to do if the vertices are not in RAM. I found a load_to_ram function in kiss3d's source code but its commented out.

(Unrelated here: but I also couldn't figure out a way to copy from my DMatrix to the Vec of Point3s without for loops)