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Explain how RegularPolygon mesh is generated (#10927)

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I didn't notice minus where vertices are generated, so could not
understand the order there.

Adding a comment to help the next person who is going to understand Bevy
by reading its code.
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Stepan Koltsov 2023-12-12 21:40:33 +00:00 committed by GitHub
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crates/bevy_render/src/mesh/shape/regular_polygon.rs
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@ -50,6 +50,8 @@ impl From<RegularPolygon> for Mesh {
let mut indices = Vec::with_capacity((sides - 2) * 3); let mut indices = Vec::with_capacity((sides - 2) * 3);
for i in 1..(sides as u32 - 1) { for i in 1..(sides as u32 - 1) {
// Vertices are generated in CW order above, hence the reversed indices here
// to emit triangle vertices in CCW order.
indices.extend_from_slice(&[0, i + 1, i]); indices.extend_from_slice(&[0, i + 1, i]);
} }