Access the triangles of the model

[tranquil wasp]

Hello! Im a newbie of bevy and I want to access the triangles of the model after loading it into the scene since i want to iterate the triangles(read). i searched online but there's no result. is there any way to achieve this?

[timid crow]

After you asset is loaded you can access it via Res<Assets<Mesh>>.

eg

fn modify_mesh(mut meshes: ResMut<Assets<Mesh>>) {
    let my_asset_handle: Handle<Mesh> = ...;
    let mesh = meshes.get_mut(&my_asset_handle).unwrap();
}

[tranquil wasp]

I know. but how to access the triangles? idk the api to achieve this. thanks for replying

can this one be used to access the triangles?

[tranquil wasp]

also I dont know how to get the handle from another system

[tranquil wasp]

Since the loading of mesh is parallel, i dont know how to wait until the completion of loading the model

[timid crow]

how are you loading the mesh in the first place?

[timid crow]

if let Some(bevy::render::mesh::VertexAttributeValues::Float32x3(ref mut vertices)) =
    mesh.attribute_mut(Mesh::ATTRIBUTE_POSITION)
{
    // modify vertices
}

[tranquil wasp]

I load the model at Startup. I tried to store the handle somewhere, but idk how to check the completion of loading the model

[timid crow]

asset_server.get_load_state

This process is a bit clunky in Bevy at the moment, hopefully it gets better in future versions

it's unfortunate there's not an example of how to do this in the repository

[tranquil wasp]

Thank you! I'll try that

[timid crow]

combining the above is how I modify the vertices of this plane in my example here (takes a sec to load) https://trent.kiwi/noise-terrain

[timid crow]

I meant like an example showing loading an asset from disk then modifying it at runtime like what you're trying to do

get_load_state is more useful because it will also tell you if the asset failed to load etc

[tranquil wasp]

ahh, anyway thank you!