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added subdivisions to shape::Plane (#7546)
# Objective There was issue #191 requesting subdivisions on the shape::Plane. I also could have used this recently. I then write the solution. Fixes #191 ## Solution I changed the shape::Plane to include subdivisions field and the code to create the subdivisions. I don't know how people are counting subdivisions so as I put in the doc comments 0 subdivisions results in the original geometry of the Plane. Greater then 0 results in the number of lines dividing the plane. I didn't know if it would be better to create a new struct that implemented this feature, say SubdivisionPlane or change Plane. I decided on changing Plane as that was what the original issue was. It would be trivial to alter this to use another struct instead of altering Plane. The issues of migration, although small, would be eliminated if a new struct was implemented. ## Changelog ### Added Added subdivisions field to shape::Plane ## Migration Guide All the examples needed to be updated to initalize the subdivisions field. Also there were two tests in tests/window that need to be updated. A user would have to update all their uses of shape::Plane to initalize the subdivisions field.
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51201ae54c
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23 changed files with 86 additions and 38 deletions
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@ -187,33 +187,76 @@ impl From<Quad> for Mesh {
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pub struct Plane {
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/// The total side length of the square.
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pub size: f32,
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/// The number of subdivisions in the mesh.
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///
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/// 0 - is the original plane geometry, the 4 points in the XZ plane.
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///
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/// 1 - is split by 1 line in the middle of the plane on both the X axis and the Z axis, resulting in a plane with 4 quads / 8 triangles.
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///
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/// 2 - is a plane split by 2 lines on both the X and Z axes, subdividing the plane into 3 equal sections along each axis, resulting in a plane with 9 quads / 18 triangles.
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///
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/// and so on...
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pub subdivisions: u32,
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}
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impl Default for Plane {
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fn default() -> Self {
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Plane { size: 1.0 }
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Plane {
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size: 1.0,
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subdivisions: 0,
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}
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}
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}
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impl Plane {
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/// Creates a new plane centered at the origin with the supplied side length and zero subdivisions.
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pub fn from_size(size: f32) -> Self {
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Self {
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size,
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subdivisions: 0,
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}
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}
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}
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impl From<Plane> for Mesh {
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fn from(plane: Plane) -> Self {
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let extent = plane.size / 2.0;
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// here this is split in the z and x directions if one ever needs asymetrical subdivision
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// two Plane struct fields would need to be added instead of the single subdivisions field
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let z_vertex_count = plane.subdivisions + 2;
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let x_vertex_count = plane.subdivisions + 2;
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let num_vertices = (z_vertex_count * x_vertex_count) as usize;
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let num_indices = ((z_vertex_count - 1) * (x_vertex_count - 1) * 6) as usize;
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let up = Vec3::Y.to_array();
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let vertices = [
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([extent, 0.0, -extent], [0.0, 1.0, 0.0], [1.0, 1.0]),
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([extent, 0.0, extent], [0.0, 1.0, 0.0], [1.0, 0.0]),
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([-extent, 0.0, extent], [0.0, 1.0, 0.0], [0.0, 0.0]),
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([-extent, 0.0, -extent], [0.0, 1.0, 0.0], [0.0, 1.0]),
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];
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let mut positions: Vec<[f32; 3]> = Vec::with_capacity(num_vertices);
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let mut normals: Vec<[f32; 3]> = Vec::with_capacity(num_vertices);
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let mut uvs: Vec<[f32; 2]> = Vec::with_capacity(num_vertices);
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let mut indices: Vec<u32> = Vec::with_capacity(num_indices);
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let indices = Indices::U32(vec![0, 2, 1, 0, 3, 2]);
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for y in 0..z_vertex_count {
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for x in 0..x_vertex_count {
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let tx = x as f32 / (x_vertex_count - 1) as f32;
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let ty = y as f32 / (z_vertex_count - 1) as f32;
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positions.push([(-0.5 + tx) * plane.size, 0.0, (-0.5 + ty) * plane.size]);
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normals.push(up);
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uvs.push([tx, 1.0 - ty]);
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}
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}
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let positions: Vec<_> = vertices.iter().map(|(p, _, _)| *p).collect();
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let normals: Vec<_> = vertices.iter().map(|(_, n, _)| *n).collect();
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let uvs: Vec<_> = vertices.iter().map(|(_, _, uv)| *uv).collect();
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for y in 0..z_vertex_count - 1 {
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for x in 0..x_vertex_count - 1 {
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let quad = y * x_vertex_count + x;
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indices.push(quad + x_vertex_count + 1);
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indices.push(quad + 1);
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indices.push(quad + x_vertex_count);
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indices.push(quad);
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indices.push(quad + x_vertex_count);
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indices.push(quad + 1);
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}
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}
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let mut mesh = Mesh::new(PrimitiveTopology::TriangleList);
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mesh.set_indices(Some(indices));
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mesh.set_indices(Some(Indices::U32(indices)));
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mesh.insert_attribute(Mesh::ATTRIBUTE_POSITION, positions);
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mesh.insert_attribute(Mesh::ATTRIBUTE_NORMAL, normals);
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mesh.insert_attribute(Mesh::ATTRIBUTE_UV_0, uvs);
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@ -17,7 +17,7 @@ fn setup(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -75,7 +75,7 @@ fn setup(
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// ground plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(shape::Plane { size: 50. }.into()),
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mesh: meshes.add(shape::Plane::from_size(50.0).into()),
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material: materials.add(Color::SILVER.into()),
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..default()
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});
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@ -148,7 +148,8 @@ fn setup(
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// Chessboard Plane
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let black_material = materials.add(Color::BLACK.into());
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let white_material = materials.add(Color::WHITE.into());
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let plane_mesh = meshes.add(shape::Plane { size: 2.0 }.into());
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let plane_mesh = meshes.add(shape::Plane::from_size(2.0).into());
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for x in -3..4 {
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for z in -3..4 {
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@ -44,7 +44,7 @@ fn setup(
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -25,7 +25,7 @@ fn setup(
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) {
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// ground plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 10.0 })),
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mesh: meshes.add(shape::Plane::from_size(10.0).into()),
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material: materials.add(StandardMaterial {
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base_color: Color::WHITE,
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perceptual_roughness: 1.0,
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@ -29,7 +29,7 @@ fn setup(
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -104,9 +104,7 @@ fn setup(
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// ground plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane {
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size: 2.0 * spawn_plane_depth,
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})),
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mesh: meshes.add(shape::Plane::from_size(2.0 * spawn_plane_depth).into()),
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material: white_handle,
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..default()
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});
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@ -67,7 +67,7 @@ fn setup(
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// floating plane - initially not a shadow receiver and not a caster
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commands.spawn((
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PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 20.0 })),
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mesh: meshes.add(shape::Plane::from_size(20.0).into()),
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material: materials.add(Color::GREEN.into()),
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transform: Transform::from_xyz(0.0, 1.0, -10.0),
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..default()
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@ -78,7 +78,7 @@ fn setup(
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// lower ground plane - initially a shadow receiver
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 20.0 })),
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mesh: meshes.add(shape::Plane::from_size(20.0).into()),
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material: white_handle,
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..default()
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});
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@ -23,7 +23,7 @@ fn setup(
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
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mesh: meshes.add(shape::Plane::from_size(100.0).into()),
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material: materials.add(StandardMaterial {
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base_color: Color::rgb(0.2, 0.2, 0.2),
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perceptual_roughness: 0.08,
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@ -24,7 +24,7 @@ fn setup(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
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mesh: meshes.add(shape::Plane::from_size(100.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -29,7 +29,7 @@ fn setup(
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) {
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// ground plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
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mesh: meshes.add(shape::Plane::from_size(100.0).into()),
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material: materials.add(StandardMaterial {
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base_color: Color::GREEN,
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perceptual_roughness: 1.0,
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@ -20,7 +20,7 @@ fn setup(
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) {
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// opaque plane, uses `alpha_mode: Opaque` by default
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 6.0 })),
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mesh: meshes.add(shape::Plane::from_size(6.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -17,7 +17,7 @@ fn setup(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -17,7 +17,7 @@ fn setup(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -30,7 +30,7 @@ fn setup(
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wireframe_config.global = false;
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -44,7 +44,7 @@ fn setup(
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// Plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 500000.0 })),
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mesh: meshes.add(shape::Plane::from_size(500000.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -55,7 +55,7 @@ fn setup_scene(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: materials.add(Color::rgb(0.1, 0.2, 0.1).into()),
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..default()
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});
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@ -26,7 +26,7 @@ fn setup(
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mut standard_materials: ResMut<Assets<StandardMaterial>>,
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) {
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: standard_materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -58,7 +58,7 @@ fn setup(
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(shape::Plane { size: 5.0 }.into()),
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mesh: meshes.add(shape::Plane::from_size(5.0).into()),
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material: std_materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -161,7 +161,7 @@ fn setup(
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// Plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5000.0 })),
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mesh: meshes.add(shape::Plane::from_size(5000.0).into()),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -36,7 +36,10 @@ fn setup_3d(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(Mesh::from(shape::Plane {
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size: 5.0,
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subdivisions: 0,
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})),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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@ -114,7 +114,10 @@ fn setup_3d(
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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mesh: meshes.add(Mesh::from(shape::Plane {
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size: 5.0,
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subdivisions: 0,
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})),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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