High Performance Point Cloud Rendering

[benjaminrwilson]

Hi,

What is the most performant way to render large point clouds (100,000+ points)? I've had success by storing the points in Mesh::new(PrimitiveTopology::PointList), but I haven't found a way to change the point size or to have per point coloring.

Is this possible with this approach? If not, what would it require?

Thanks!

[torsteingrindvik]

I'm not sure about most performant.
But I think you'll be able to achieve this by using a storage buffer written on the CPU and copied and bound in the GPU.
If there is 1 color per point and 1 vertex per point you should be able to use the vertex index directly to read the correct color in the shader.

[superdump]

I did some hacks here for drawing many quads: https://github.com/superdump/bevy-vertex-pulling/blob/main/examples/quads/main.rs The approach is basically what @torsteingrindvik was suggesting.

[benjaminrwilson]

Awesome. Thanks @torsteingrindvik and @superdump! The advice, example, and https://github.com/bevyengine/bevy/blob/main/examples/shader/shader_instancing.rs got me what I needed.

[ottah]

If you want really performant point clouds you could write a compute rasterizer and output to a texture.

Theres some linked papers in this repo https://github.com/m-schuetz/compute_rasterizer

[benjaminrwilson]

Thanks, I'll have a look!

[geoproces]

Hi Benjamin , I am land surveyor working with points clouds ,is there any chance you can send me example of point clouds to be imported tu bevy ?

[mosure]

see https://github.com/mosure/bevy_gaussian_splatting