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Alternative fix for mesh2d_manual example (#15883)

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# Objective

Fixes #15847

Alternative to #15862. Would appreciate a rendering person signaling
preference for one or the other.

## Solution

Partially revert the changes made to this example in #15524.

Add comment explaining that the non-usage of the built-in color vertex
attribute is intentional.

## Testing

`cargo run --example mesh2d_manual`
This commit is contained in:
Rob Parrett 2024-10-13 18:02:23 -07:00 committed by GitHub
parent 93fc2d12cf
commit 9dd6f42b32
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1 changed files with 9 additions and 5 deletions
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14
examples/2d/mesh2d_manual.rs
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@ -11,7 +11,7 @@ use bevy::{
math::{ops, FloatOrd}, math::{ops, FloatOrd},
prelude::*, prelude::*,
render::{ render::{
mesh::{Indices, RenderMesh}, mesh::{Indices, MeshVertexAttribute, RenderMesh},
render_asset::{RenderAssetUsages, RenderAssets}, render_asset::{RenderAssetUsages, RenderAssets},
render_phase::{ render_phase::{
AddRenderCommand, DrawFunctions, PhaseItemExtraIndex, SetItemPipeline, AddRenderCommand, DrawFunctions, PhaseItemExtraIndex, SetItemPipeline,
@ -84,10 +84,14 @@ fn star(
} }
// Set the position attribute // Set the position attribute
star.insert_attribute(Mesh::ATTRIBUTE_POSITION, v_pos); star.insert_attribute(Mesh::ATTRIBUTE_POSITION, v_pos);
// And a RGB color attribute as well // And a RGB color attribute as well. A built-in `Mesh::ATTRIBUTE_COLOR` exists, but we
let mut v_color: Vec<[f32; 4]> = vec![LinearRgba::BLACK.to_f32_array()]; // use a custom vertex attribute here for demonstration purposes.
v_color.extend_from_slice(&[LinearRgba::from(YELLOW).to_f32_array(); 10]); let mut v_color: Vec<u32> = vec![LinearRgba::BLACK.as_u32()];
star.insert_attribute(Mesh::ATTRIBUTE_COLOR, v_color); v_color.extend_from_slice(&[LinearRgba::from(YELLOW).as_u32(); 10]);
star.insert_attribute(
MeshVertexAttribute::new("Vertex_Color", 1, VertexFormat::Uint32),
v_color,
);
// Now, we specify the indices of the vertex that are going to compose the // Now, we specify the indices of the vertex that are going to compose the
// triangles in our star. Vertices in triangles have to be specified in CCW // triangles in our star. Vertices in triangles have to be specified in CCW