[Merged by Bors] - bevy_pbr2: Add support for not casting/receiving shadows #2726
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Having to add a zero-sized type component to every entity to mark it as a shadow caster or shadow receiver by default feels quite unnecessary. As such, I have added NotShadowCaster and NotShadowReceiver components. This introduces double-negatives like Without<NotShadowReceiver>, etc but it means that only the exceptions have to be specified in user code. I also added an example to illustrate the effect.
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This looks good to me / I think its worth merging as-is for now. My biggest questions are around "ideal user facing apis". There are lots of options here. Some engines make "shadow receiving" a material property, which might make sense here. I also want to consider something like: struct ShadowCaster {
enabled: bool,
}To avoid the need for adding removing components / make the settings more discoverable. But yeah this impl looks solid and I'd rather integrate it sooner than later. I removed the camera controls from the new example because they make it bigger / more complicated and I dont think the example benefits from freedom of movement. |
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# Objective Allow marking meshes as not casting / receiving shadows. ## Solution - Added `NotShadowCaster` and `NotShadowReceiver` zero-sized type components. - Extract these components into `bool`s in `ExtractedMesh` - Only generate `DrawShadowMesh` `Drawable`s for meshes _without_ `NotShadowCaster` - Add a `u32` bit `flags` member to `MeshUniform` with one flag indicating whether the mesh is a shadow receiver - If a mesh does _not_ have the `NotShadowReceiver` component, then it is a shadow receiver, and so the bit in the `MeshUniform` is set, otherwise it is not set. - Added an example illustrating the functionality. NOTE: I wanted to have the default state of a mesh as being a shadow caster and shadow receiver, hence the `Not*` components. However, I am on the fence about this. I don't want to have a negative performance impact, nor have people wondering why their custom meshes don't have shadows because they forgot to add `ShadowCaster` and `ShadowReceiver` components, but I also really don't like the double negatives the `Not*` approach incurs. What do you think? Co-authored-by: Carter Anderson <mcanders1@gmail.com>
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Objective
Allow marking meshes as not casting / receiving shadows.
Solution
NotShadowCasterandNotShadowReceiverzero-sized type components.bools inExtractedMeshDrawShadowMeshDrawables for meshes withoutNotShadowCasteru32bitflagsmember toMeshUniformwith one flag indicating whether the mesh is a shadow receiverNotShadowReceivercomponent, then it is a shadow receiver, and so the bit in theMeshUniformis set, otherwise it is not set.NOTE: I wanted to have the default state of a mesh as being a shadow caster and shadow receiver, hence the
Not*components. However, I am on the fence about this. I don't want to have a negative performance impact, nor have people wondering why their custom meshes don't have shadows because they forgot to addShadowCasterandShadowReceivercomponents, but I also really don't like the double negatives theNot*approach incurs. What do you think?