Banana example #6
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ThierryBerger
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Mar 14, 2025
ThierryBerger
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Mar 14, 2025
ThierryBerger
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Mar 14, 2025
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ThierryBerger
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Mar 18, 2025
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| device: RenderDevice, | ||
| app_state: &mut AppState, | ||
| _callbacks: &mut Callbacks, | ||
| ) -> PhysicsContext { |
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examples function signature was changed to be slightly less bevy-specific, the device is still a bevy struct ; and the other parameters implement resource though 🤔
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| // NOTE: Heightfield may be more efficient or more predictable than trimesh for the knife. | ||
| let heights = nalgebra::DMatrix::zeros(10, 5); | ||
| let heightfield = rapier3d::prelude::HeightField::new(heights, vector![2.0, 1.0, 10.0]); | ||
| let (mut vtx, idx) = heightfield.to_trimesh(); | ||
| vtx.iter_mut().for_each(|pt| { | ||
| *pt = Isometry3::rotation(vector![0f32, 0f32, -90f32.to_radians()]) * *pt | ||
| + vector![0.0, 1f32, 0f32] | ||
| }); | ||
| let co = ColliderBuilder::trimesh(vtx, idx).unwrap(); | ||
| rapier_data | ||
| .colliders | ||
| .insert_with_parent(co, parent_handle, &mut rapier_data.bodies); | ||
| */ | ||
| for (vertices, indices) in slicer_trimeshes.iter() { | ||
| // Insert collider into rapier state. | ||
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| let collider = ColliderBuilder::new( | ||
| SharedShape::trimesh_with_flags( | ||
| vertices.clone(), | ||
| indices | ||
| .chunks_exact(3) | ||
| .map(|i| [i[0] as u32, i[1] as u32, i[2] as u32]) | ||
| .collect(), | ||
| TriMeshFlags::FIX_INTERNAL_EDGES, | ||
| ) | ||
| .unwrap(), | ||
| ); | ||
| rapier_data | ||
| .colliders | ||
| .insert_with_parent(collider, parent_handle, &mut rapier_data.bodies); |
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I'm not sure what's the preferred behaviour there, using a model for collision is interesting, using a heightmap will probably be more stable (but it should probably be a quad if we're after simplicity)
| let y_pos = 1.3; | ||
| let z_pos = -1.5; | ||
| let velocity = 0.9; | ||
| let extended_width = 0.15; // extended width for the horizontal move to the right |
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I tried to keep the code similar to the taichi implementation, with adapted values above to fit the models used.
I added "extended_width" to have additional room for the banana slices to split more correctly (otherwise they have a tendency to stick together)
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ThierryBerger
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Mar 21, 2025
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| # Notes | ||
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| banana example: | ||
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| - oneway+dynamic coupling makes the knife going places (bouncing weirdly). |
This was referenced Apr 7, 2025
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Adds an example based on taichi mpm demo, cutting a banana ; it also features a particle coloring based on closest vertex's color
Screencast.from.03-11-2025.03_52_13.PM.mp4
Screencast.from.03-12-2025.01_04_04.PM.mp4
other PRs are based on this one: