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# Objective Related to #10572 Allow the `Annulus` primitive to be meshed. ## Solution We introduce a `Meshable` structure, `AnnulusMeshBuilder`, which allows the `Annulus` primitive to be meshed, leaving optional configuration of the number of angular sudivisions to the user. Here is a picture of the annulus's UV-mapping: <img width="1440" alt="Screenshot 2024-03-26 at 10 39 48 AM" src="https://github.com/bevyengine/bevy/assets/2975848/b170291d-cba7-441b-90ee-2ad6841eaedb"> Other features are essentially identical to the implementations for `Circle`/`Ellipse`. --- ## Changelog - Introduced `AnnulusMeshBuilder` - Implemented `Meshable` for `Annulus` with `Output = AnnulusMeshBuilder` - Implemented `From<Annulus>` and `From<AnnulusMeshBuilder>` for `Mesh` - Added `impl_reflect!` declaration for `Annulus` and `Triangle3d` in `bevy_reflect` --- ## Discussion ### Design considerations The only interesting wrinkle here is that the existing UV-mapping of `Ellipse` (and hence of `Circle` and `RegularPolygon`) is non-radial (it's skew-free, created by situating the mesh in a bounding rectangle), so the UV-mapping of `Annulus` doesn't limit to that of `Circle` as its inner radius tends to zero, for instance. I don't see this as a real issue for `Annulus`, which should almost certainly have this kind of UV-mapping, but I think we ought to at least consider allowing mesh configuration for `Circle`/`Ellipse` that performs radial UV-mapping instead. (In these cases in particular, it would be especially easy, since we wouldn't need a different parameter set in the builder.) --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> |
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| bevy_a11y | ||
| bevy_animation | ||
| bevy_app | ||
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| bevy_audio | ||
| bevy_color | ||
| bevy_core | ||
| bevy_core_pipeline | ||
| bevy_derive | ||
| bevy_dev_tools | ||
| bevy_diagnostic | ||
| bevy_dylib | ||
| bevy_dynamic_plugin | ||
| bevy_ecs | ||
| bevy_ecs_compile_fail_tests | ||
| bevy_encase_derive | ||
| bevy_gilrs | ||
| bevy_gizmos | ||
| bevy_gltf | ||
| bevy_hierarchy | ||
| bevy_input | ||
| bevy_internal | ||
| bevy_log | ||
| bevy_macro_utils | ||
| bevy_macros_compile_fail_tests | ||
| bevy_math | ||
| bevy_mikktspace | ||
| bevy_pbr | ||
| bevy_ptr | ||
| bevy_reflect | ||
| bevy_reflect_compile_fail_tests | ||
| bevy_render | ||
| bevy_scene | ||
| bevy_sprite | ||
| bevy_tasks | ||
| bevy_text | ||
| bevy_time | ||
| bevy_transform | ||
| bevy_ui | ||
| bevy_utils | ||
| bevy_window | ||
| bevy_winit | ||