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# Objective - Implement `Meshable` for `Extrusion<T>` ## Solution - `Meshable` requires `Meshable::Output: MeshBuilder` now. This means that all `some_primitive.mesh()` calls now return a `MeshBuilder`. These were added for primitives that did not have one prior to this. - A new trait `Extrudable: MeshBuilder` has been added. This trait allows you to specify the indices of the perimeter of the mesh created by this `MeshBuilder` and whether they are to be shaded smooth or flat. - `Extrusion<P: Primitive2d + Meshable>` is now `Meshable` aswell. The associated `MeshBuilder` is `ExtrusionMeshBuilder` which is generic over `P` and uses the `MeshBuilder` of its baseshape internally. - `ExtrusionMeshBuilder` exposes the configuration functions of its base-shapes builder. - Updated the `3d_shapes` example to include `Extrusion`s ## Migration Guide - Depending on the context, you may need to explicitly call `.mesh().build()` on primitives where you have previously called `.mesh()` - The `Output` type of custom `Meshable` implementations must now derive `MeshBuilder`. ## Additional information - The extrusions UVs are done so that - the front face (`+Z`) is in the area between `(0, 0)` and `(0.5, 0.5)`, - the back face (`-Z`) is in the area between `(0.5, 0)` and `(1, 0.5)` - the mantle is in the area between `(0, 0.5)` and `(1, 1)`. Each `PerimeterSegment` you specified in the `Extrudable` implementation will be allocated an equal portion of this area. - The UVs of the base shape are scaled to be in the front/back area so whatever method of filling the full UV-space the base shape used is how these areas will be filled. Here is an example of what that looks like on a capsule: https://github.com/bevyengine/bevy/assets/62256001/425ad288-fbbc-4634-9d3f-5e846cdce85f This is the texture used:  The `3d_shapes` example now looks like this:  --------- Co-authored-by: Lynn Büttgenbach <62256001+solis-lumine-vorago@users.noreply.github.com> Co-authored-by: Matty <weatherleymatthew@gmail.com> Co-authored-by: Matty <2975848+mweatherley@users.noreply.github.com> |
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| .. | ||
| 3d_scene.rs | ||
| 3d_shapes.rs | ||
| 3d_viewport_to_world.rs | ||
| animated_material.rs | ||
| anisotropy.rs | ||
| anti_aliasing.rs | ||
| atmospheric_fog.rs | ||
| auto_exposure.rs | ||
| blend_modes.rs | ||
| bloom_3d.rs | ||
| clearcoat.rs | ||
| color_grading.rs | ||
| deferred_rendering.rs | ||
| depth_of_field.rs | ||
| fog.rs | ||
| generate_custom_mesh.rs | ||
| irradiance_volumes.rs | ||
| lighting.rs | ||
| lightmaps.rs | ||
| lines.rs | ||
| load_gltf.rs | ||
| load_gltf_extras.rs | ||
| meshlet.rs | ||
| motion_blur.rs | ||
| orthographic.rs | ||
| parallax_mapping.rs | ||
| parenting.rs | ||
| pbr.rs | ||
| reflection_probes.rs | ||
| render_to_texture.rs | ||
| shadow_biases.rs | ||
| shadow_caster_receiver.rs | ||
| skybox.rs | ||
| spherical_area_lights.rs | ||
| split_screen.rs | ||
| spotlight.rs | ||
| ssao.rs | ||
| ssr.rs | ||
| texture.rs | ||
| tonemapping.rs | ||
| transmission.rs | ||
| transparency_3d.rs | ||
| two_passes.rs | ||
| update_gltf_scene.rs | ||
| vertex_colors.rs | ||
| visibility_range.rs | ||
| volumetric_fog.rs | ||
| wireframe.rs | ||