Color particles depending on text #4
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Vrixyz
commented
Apr 10, 2025
Comment on lines
+159
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+195
| pub mod read_particles { | ||
| use super::*; | ||
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| use bevy::render::{render_resource::BufferUsages, renderer::RenderQueue}; | ||
| use nalgebra::Vector4; | ||
| use wgcore::tensor::GpuVector; | ||
| use wgsparkl3d::solver::GpuParticles; | ||
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| pub fn read_particles_positions( | ||
| render_device: RenderDevice, | ||
| render_queue: RenderQueue, | ||
| particles: &GpuParticles, | ||
| ) -> Vec<Vector4<f32>> { | ||
| // Get the `render_device` is the `Res<RenderDevice>` bevy resource. | ||
| let device = render_device.wgpu_device(); | ||
| // Create the staging buffer. | ||
| // Here `particles` is of type `GpuParticles`, accessible from | ||
| // `PhysicsContext::data::particles`. | ||
| let positions_staging: GpuVector<Vector4<f32>> = GpuVector::uninit( | ||
| device, | ||
| particles.len() as u32, | ||
| BufferUsages::COPY_DST | BufferUsages::MAP_READ, | ||
| ); | ||
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| // Copy the buffer. | ||
| // `render_queue` the `Res<RenderQueue>` bevy resource. | ||
| let compute_queue = &*render_queue.0; | ||
| let mut encoder = device.create_command_encoder(&Default::default()); | ||
| positions_staging.copy_from(&mut encoder, &particles.positions); | ||
| compute_queue.submit(Some(encoder.finish())); | ||
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| // Run the copy. The fourth component of each entry can be ignored. | ||
| let positions: Vec<Vector4<f32>> = | ||
| futures::executor::block_on(positions_staging.read(device)).unwrap(); | ||
| positions | ||
| } | ||
| } |
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This would be useful as part of the main library.
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This allows to have neat-looking demos disclosing a word: