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Explain usage of prepass shaders in docs for Material trait (#9025)

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# Objective

- Fixes #8696.

## Solution

- Added a paragraph describing the usage of the `prepass_vertex_shader`
and `prepass_fragment_shader`.
This commit is contained in:
Edgar Geier 2023-10-16 15:39:17 +02:00 committed by GitHub
parent 06d148bae1
commit e23d7cf501
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crates/bevy_pbr/src/material.rs
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@ -136,12 +136,18 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
/// Returns this material's prepass vertex shader. If [`ShaderRef::Default`] is returned, the default prepass vertex shader
/// will be used.
///
/// This is used for the various [prepasses](bevy_core_pipeline::prepass) as well as for generating the depth maps
/// required for shadow mapping.
fn prepass_vertex_shader() -> ShaderRef {
ShaderRef::Default
}
/// Returns this material's prepass fragment shader. If [`ShaderRef::Default`] is returned, the default prepass fragment shader
/// will be used.
///
/// This is used for the various [prepasses](bevy_core_pipeline::prepass) as well as for generating the depth maps
/// required for shadow mapping.
#[allow(unused_variables)]
fn prepass_fragment_shader() -> ShaderRef {
ShaderRef::Default