From aa9738e1ea6a191b7d3481f31dc624c8c594df6a Mon Sep 17 00:00:00 2001 From: Aevyrie Date: Sun, 27 Oct 2024 12:03:48 -0700 Subject: [PATCH] Mesh picking fixes (#16110) # Objective - Mesh picking is noisy when a non triangle list is used - Mesh picking runs even when users don't need it - Resolve #16065 ## Solution - Don't add the mesh picking plugin by default - Remove error spam --- .../bevy_picking/ray_mesh_intersection.rs | 2 +- crates/bevy_picking/src/lib.rs | 18 +- .../mesh_picking/ray_cast/intersections.rs | 174 +++++++----------- examples/picking/mesh_picking.rs | 28 ++- examples/picking/simple_picking.rs | 61 +++--- 5 files changed, 126 insertions(+), 157 deletions(-) diff --git a/benches/benches/bevy_picking/ray_mesh_intersection.rs b/benches/benches/bevy_picking/ray_mesh_intersection.rs index 6be84a649d..f451b79061 100644 --- a/benches/benches/bevy_picking/ray_mesh_intersection.rs +++ b/benches/benches/bevy_picking/ray_mesh_intersection.rs @@ -1,5 +1,5 @@ use bevy_math::{Dir3, Mat4, Ray3d, Vec3}; -use bevy_picking::{mesh_picking::ray_cast, prelude::*}; +use bevy_picking::mesh_picking::ray_cast; use criterion::{black_box, criterion_group, criterion_main, Criterion}; fn ptoxznorm(p: u32, size: u32) -> (f32, f32) { diff --git a/crates/bevy_picking/src/lib.rs b/crates/bevy_picking/src/lib.rs index 6c62eb5b14..0ba8042046 100644 --- a/crates/bevy_picking/src/lib.rs +++ b/crates/bevy_picking/src/lib.rs @@ -277,24 +277,10 @@ pub struct DefaultPickingPlugins; impl PluginGroup for DefaultPickingPlugins { fn build(self) -> PluginGroupBuilder { - #[cfg_attr( - not(feature = "bevy_mesh"), - expect( - unused_mut, - reason = "Group is not mutated when `bevy_mesh` is not enabled." - ) - )] - let mut group = PluginGroupBuilder::start::() + PluginGroupBuilder::start::() .add(input::PointerInputPlugin::default()) .add(PickingPlugin::default()) - .add(InteractionPlugin); - - #[cfg(feature = "bevy_mesh")] - { - group = group.add(mesh_picking::MeshPickingPlugin); - }; - - group + .add(InteractionPlugin) } } diff --git a/crates/bevy_picking/src/mesh_picking/ray_cast/intersections.rs b/crates/bevy_picking/src/mesh_picking/ray_cast/intersections.rs index 0cea98e566..d4ec97e1f3 100644 --- a/crates/bevy_picking/src/mesh_picking/ray_cast/intersections.rs +++ b/crates/bevy_picking/src/mesh_picking/ray_cast/intersections.rs @@ -1,7 +1,6 @@ use bevy_math::{bounding::Aabb3d, Dir3, Mat4, Ray3d, Vec3, Vec3A}; use bevy_reflect::Reflect; -use bevy_render::mesh::{Indices, Mesh, PrimitiveTopology, VertexAttributeValues}; -use bevy_utils::tracing::{error, warn}; +use bevy_render::mesh::{Indices, Mesh, PrimitiveTopology}; use super::Backfaces; @@ -17,7 +16,7 @@ pub struct RayMeshHit { /// The distance from the ray origin to the intersection point. pub distance: f32, /// The vertices of the triangle that was hit. - pub triangle: Option<[Vec3A; 3]>, + pub triangle: Option<[Vec3; 3]>, /// The index of the triangle that was hit. pub triangle_index: Option, } @@ -32,84 +31,41 @@ pub struct RayTriangleHit { /// Casts a ray on a mesh, and returns the intersection. pub(super) fn ray_intersection_over_mesh( mesh: &Mesh, - mesh_transform: &Mat4, + transform: &Mat4, ray: Ray3d, - backface_culling: Backfaces, + culling: Backfaces, ) -> Option { if mesh.primitive_topology() != PrimitiveTopology::TriangleList { - error!( - "Invalid intersection check: `TriangleList` is the only supported `PrimitiveTopology`" - ); - return None; + return None; // ray_mesh_intersection assumes vertices are laid out in a triangle list } + // Vertex positions are required + let positions = mesh.attribute(Mesh::ATTRIBUTE_POSITION)?.as_float3()?; - // Get the vertex positions and normals from the mesh. - let vertex_positions: &Vec<[f32; 3]> = match mesh.attribute(Mesh::ATTRIBUTE_POSITION) { - None => { - error!("Mesh does not contain vertex positions"); - return None; - } - Some(vertex_values) => match &vertex_values { - VertexAttributeValues::Float32x3(positions) => positions, - _ => { - error!("Unexpected types in {:?}", Mesh::ATTRIBUTE_POSITION); - return None; - } - }, - }; - let vertex_normals: Option<&[[f32; 3]]> = - if let Some(normal_values) = mesh.attribute(Mesh::ATTRIBUTE_NORMAL) { - match &normal_values { - VertexAttributeValues::Float32x3(normals) => Some(normals), - _ => None, - } - } else { - None - }; + // Normals are optional + let normals = mesh + .attribute(Mesh::ATTRIBUTE_NORMAL) + .and_then(|normal_values| normal_values.as_float3()); - if let Some(indices) = &mesh.indices() { - match indices { - Indices::U16(vertex_indices) => ray_mesh_intersection( - ray, - mesh_transform, - vertex_positions, - vertex_normals, - Some(vertex_indices), - backface_culling, - ), - Indices::U32(vertex_indices) => ray_mesh_intersection( - ray, - mesh_transform, - vertex_positions, - vertex_normals, - Some(vertex_indices), - backface_culling, - ), + match mesh.indices() { + Some(Indices::U16(indices)) => { + ray_mesh_intersection(ray, transform, positions, normals, Some(indices), culling) } - } else { - ray_mesh_intersection( - ray, - mesh_transform, - vertex_positions, - vertex_normals, - None::<&[usize]>, - backface_culling, - ) + Some(Indices::U32(indices)) => { + ray_mesh_intersection(ray, transform, positions, normals, Some(indices), culling) + } + None => ray_mesh_intersection::(ray, transform, positions, normals, None, culling), } } /// Checks if a ray intersects a mesh, and returns the nearest intersection if one exists. -pub fn ray_mesh_intersection( +pub fn ray_mesh_intersection + Clone + Copy>( ray: Ray3d, mesh_transform: &Mat4, - vertex_positions: &[[f32; 3]], + positions: &[[f32; 3]], vertex_normals: Option<&[[f32; 3]]>, - indices: Option<&[Index]>, + indices: Option<&[I]>, backface_culling: Backfaces, -) -> Option -where - usize: TryFrom, -{ +) -> Option { // The ray cast can hit the same mesh many times, so we need to track which hit is // closest to the camera, and record that. let mut closest_hit_distance = f32::MAX; @@ -123,38 +79,36 @@ where ); if let Some(indices) = indices { - // Make sure this chunk has 3 vertices to avoid a panic. + // The index list must be a multiple of three. If not, the mesh is malformed and the raycast + // result might be nonsensical. if indices.len() % 3 != 0 { - warn!("Index list not a multiple of 3"); return None; } - // Now that we're in the vector of vertex indices, we want to look at the vertex - // positions for each triangle, so we'll take indices in chunks of three, where each - // chunk of three indices are references to the three vertices of a triangle. - for index_chunk in indices.chunks_exact(3) { - let [index1, index2, index3] = [ - usize::try_from(index_chunk[0]).ok()?, - usize::try_from(index_chunk[1]).ok()?, - usize::try_from(index_chunk[2]).ok()?, + for triangle in indices.chunks_exact(3) { + let [a, b, c] = [ + triangle[0].try_into().ok()?, + triangle[1].try_into().ok()?, + triangle[2].try_into().ok()?, ]; - let triangle_index = Some(index1); - let tri_vertex_positions = [ - Vec3A::from(vertex_positions[index1]), - Vec3A::from(vertex_positions[index2]), - Vec3A::from(vertex_positions[index3]), + + let triangle_index = Some(a); + let tri_vertex_positions = &[ + Vec3::from(positions[a]), + Vec3::from(positions[b]), + Vec3::from(positions[c]), ]; let tri_normals = vertex_normals.map(|normals| { [ - Vec3A::from(normals[index1]), - Vec3A::from(normals[index2]), - Vec3A::from(normals[index3]), + Vec3::from(normals[a]), + Vec3::from(normals[b]), + Vec3::from(normals[c]), ] }); let Some(hit) = triangle_intersection( tri_vertex_positions, - tri_normals, + tri_normals.as_ref(), closest_hit_distance, &mesh_space_ray, backface_culling, @@ -171,9 +125,9 @@ where .length(), triangle: hit.triangle.map(|tri| { [ - mesh_transform.transform_point3a(tri[0]), - mesh_transform.transform_point3a(tri[1]), - mesh_transform.transform_point3a(tri[2]), + mesh_transform.transform_point3(tri[0]), + mesh_transform.transform_point3(tri[1]), + mesh_transform.transform_point3(tri[2]), ] }), triangle_index, @@ -181,23 +135,23 @@ where closest_hit_distance = hit.distance; } } else { - for (i, chunk) in vertex_positions.chunks_exact(3).enumerate() { - let &[a, b, c] = chunk else { + for (i, triangle) in positions.chunks_exact(3).enumerate() { + let &[a, b, c] = triangle else { continue; }; let triangle_index = Some(i); - let tri_vertex_positions = [Vec3A::from(a), Vec3A::from(b), Vec3A::from(c)]; + let tri_vertex_positions = &[Vec3::from(a), Vec3::from(b), Vec3::from(c)]; let tri_normals = vertex_normals.map(|normals| { [ - Vec3A::from(normals[i]), - Vec3A::from(normals[i + 1]), - Vec3A::from(normals[i + 2]), + Vec3::from(normals[i]), + Vec3::from(normals[i + 1]), + Vec3::from(normals[i + 2]), ] }); let Some(hit) = triangle_intersection( tri_vertex_positions, - tri_normals, + tri_normals.as_ref(), closest_hit_distance, &mesh_space_ray, backface_culling, @@ -214,9 +168,9 @@ where .length(), triangle: hit.triangle.map(|tri| { [ - mesh_transform.transform_point3a(tri[0]), - mesh_transform.transform_point3a(tri[1]), - mesh_transform.transform_point3a(tri[2]), + mesh_transform.transform_point3(tri[0]), + mesh_transform.transform_point3(tri[1]), + mesh_transform.transform_point3(tri[2]), ] }), triangle_index, @@ -228,15 +182,14 @@ where closest_hit } -#[inline(always)] fn triangle_intersection( - tri_vertices: [Vec3A; 3], - tri_normals: Option<[Vec3A; 3]>, + tri_vertices: &[Vec3; 3], + tri_normals: Option<&[Vec3; 3]>, max_distance: f32, ray: &Ray3d, backface_culling: Backfaces, ) -> Option { - let hit = ray_triangle_intersection(ray, &tri_vertices, backface_culling)?; + let hit = ray_triangle_intersection(ray, tri_vertices, backface_culling)?; if hit.distance < 0.0 || hit.distance > max_distance { return None; @@ -258,25 +211,24 @@ fn triangle_intersection( Some(RayMeshHit { point, - normal: normal.into(), + normal, barycentric_coords: barycentric, distance: hit.distance, - triangle: Some(tri_vertices), + triangle: Some(*tri_vertices), triangle_index: None, }) } /// Takes a ray and triangle and computes the intersection. -#[inline(always)] fn ray_triangle_intersection( ray: &Ray3d, - triangle: &[Vec3A; 3], + triangle: &[Vec3; 3], backface_culling: Backfaces, ) -> Option { // Source: https://www.scratchapixel.com/lessons/3d-basic-rendering/ray-tracing-rendering-a-triangle/moller-trumbore-ray-triangle-intersection - let vector_v0_to_v1: Vec3A = triangle[1] - triangle[0]; - let vector_v0_to_v2: Vec3A = triangle[2] - triangle[0]; - let p_vec: Vec3A = (Vec3A::from(*ray.direction)).cross(vector_v0_to_v2); + let vector_v0_to_v1: Vec3 = triangle[1] - triangle[0]; + let vector_v0_to_v2: Vec3 = triangle[2] - triangle[0]; + let p_vec: Vec3 = ray.direction.cross(vector_v0_to_v2); let determinant: f32 = vector_v0_to_v1.dot(p_vec); match backface_culling { @@ -298,14 +250,14 @@ fn ray_triangle_intersection( let determinant_inverse = 1.0 / determinant; - let t_vec = Vec3A::from(ray.origin) - triangle[0]; + let t_vec = ray.origin - triangle[0]; let u = t_vec.dot(p_vec) * determinant_inverse; if !(0.0..=1.0).contains(&u) { return None; } let q_vec = t_vec.cross(vector_v0_to_v1); - let v = Vec3A::from(*ray.direction).dot(q_vec) * determinant_inverse; + let v = (*ray.direction).dot(q_vec) * determinant_inverse; if v < 0.0 || u + v > 1.0 { return None; } diff --git a/examples/picking/mesh_picking.rs b/examples/picking/mesh_picking.rs index 9c0d813042..5193c4ea8f 100644 --- a/examples/picking/mesh_picking.rs +++ b/examples/picking/mesh_picking.rs @@ -1,10 +1,23 @@ //! A simple 3D scene to demonstrate mesh picking. //! -//! By default, all meshes are pickable. Picking can be disabled for individual entities -//! by adding [`PickingBehavior::IGNORE`]. +//! [`bevy::picking::backend`] provides an API for adding picking hit tests to any entity. To get +//! started with picking 3d meshes, the [`MeshPickingPlugin`] is provided as a simple starting +//! point, especially useful for debugging. For your game, you may want to use a 3d picking backend +//! provided by your physics engine, or a picking shader, depending on your specific use case. //! -//! If you want mesh picking to be entirely opt-in, you can set [`MeshPickingSettings::require_markers`] -//! to `true` and add a [`RayCastPickable`] component to the desired camera and target entities. +//! [`bevy::picking`] allows you to compose backends together to make any entity on screen pickable +//! with pointers, regardless of how that entity is rendered. For example, `bevy_ui` and +//! `bevy_sprite` provide their own picking backends that can be enabled at the same time as this +//! mesh picking backend. This makes it painless to deal with cases like the UI or sprites blocking +//! meshes underneath them, or vice versa. +//! +//! If you want to build more complex interactions than afforded by the provided pointer events, you +//! may want to use [`MeshRayCast`] or a full physics engine with raycasting capabilities. +//! +//! By default, the mesh picking plugin will raycast against all entities, which is especially +//! useful for debugging. If you want mesh picking to be opt-in, you can set +//! [`MeshPickingSettings::require_markers`] to `true` and add a [`RayCastPickable`] component to +//! the desired camera and target entities. use std::f32::consts::PI; @@ -19,7 +32,12 @@ use bevy::{ fn main() { App::new() - .add_plugins(DefaultPlugins) + .add_plugins(( + DefaultPlugins, + // The mesh picking plugin is not enabled by default, because raycasting against all + // meshes has a performance cost. + MeshPickingPlugin, + )) .init_resource::() .add_systems(Startup, setup) .add_systems(Update, (on_mesh_hover, rotate)) diff --git a/examples/picking/simple_picking.rs b/examples/picking/simple_picking.rs index d3e3ce2b3f..d71e4dcda2 100644 --- a/examples/picking/simple_picking.rs +++ b/examples/picking/simple_picking.rs @@ -1,14 +1,15 @@ -//! A simple scene to demonstrate picking events +//! A simple scene to demonstrate picking events for UI and mesh entities. -use bevy::{color::palettes::tailwind::CYAN_400, prelude::*}; +use bevy::prelude::*; fn main() { - let mut app = App::new(); - app.add_plugins(DefaultPlugins); - - app.add_systems(Startup, setup); - - app.run(); + App::new() + .add_plugins(( + DefaultPlugins, + MeshPickingPlugin, // Needed for mesh picking, not added by default + )) + .add_systems(Startup, setup) + .run(); } /// set up a simple 3D scene @@ -19,7 +20,7 @@ fn setup( ) { commands .spawn(( - Text::new("Click Me to get a box"), + Text::new("Click Me to get a box\nDrag cubes to rotate"), Node { position_type: PositionType::Absolute, top: Val::Percent(12.0), @@ -27,20 +28,7 @@ fn setup( ..default() }, )) - .observe( - |_click: Trigger>, - mut commands: Commands, - mut meshes: ResMut>, - mut materials: ResMut>, - mut num: Local| { - commands.spawn(( - Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))), - MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))), - Transform::from_xyz(0.0, 0.5 + 1.1 * *num as f32, 0.0), - )); - *num += 1; - }, - ) + .observe(on_pointer_click_spawn_cube) .observe( |evt: Trigger>, mut texts: Query<&mut TextColor>| { let mut color = texts.get_mut(evt.entity()).unwrap(); @@ -50,7 +38,7 @@ fn setup( .observe( |evt: Trigger>, mut texts: Query<&mut TextColor>| { let mut color = texts.get_mut(evt.entity()).unwrap(); - color.0 = CYAN_400.into(); + color.0 = bevy::color::palettes::tailwind::CYAN_400.into(); }, ); // circular base @@ -73,3 +61,28 @@ fn setup( Transform::from_xyz(-2.5, 4.5, 9.0).looking_at(Vec3::ZERO, Vec3::Y), )); } + +fn on_pointer_click_spawn_cube( + _click: Trigger>, + mut commands: Commands, + mut meshes: ResMut>, + mut materials: ResMut>, + mut num: Local, +) { + commands + .spawn(( + Mesh3d(meshes.add(Cuboid::new(0.5, 0.5, 0.5))), + MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))), + Transform::from_xyz(0.0, 0.25 + 0.55 * *num as f32, 0.0), + )) + // With the MeshPickingPlugin added, you can add pointer event observers to meshes as well: + .observe( + |drag: Trigger>, mut transforms: Query<&mut Transform>| { + if let Ok(mut transform) = transforms.get_mut(drag.entity()) { + transform.rotate_y(drag.delta.x * 0.02); + transform.rotate_x(drag.delta.y * 0.02); + } + }, + ); + *num += 1; +}