add an example for sprites with a custom shape

[mockersf]

It has come to my attention in #2957 that it may not be common knowledge that this is relatively easy to do.

This shows 4 lines of sprites with custom shapes:

• one line of shapes based on the formula for a star with a plain color
• one line of shapes based on the formula for a star with an image
• one line of shapes based on the formula for a disc with a plain color
• one line of shapes based on the formula for a disc with an image

[DJMcNab]

Could we have a method on Mesh which abstracts creating them based on 2d points? I assume doing UVs properly would be hairy?

This code is not exactly trivial to read.

[Davier]

I believe this is currently not supported on the new renderer. Should it be?

[Nilirad]

Could we have a method on Mesh which abstracts creating them based on 2d points?

I think for regular polygons it's ok, but for stars it's a bit odd, since they're used more rarely. Alternatively, we can make a parametrized primitive shape, just like it has been done for Capsule.

I believe this is currently not supported on the new renderer. Should it be?

Sorry if I didn't understand your question, but this example is not presenting any fancy new feature. It just shows how to customize the Mesh and Handle<ColorMaterial> components already present in SpriteBundle to make custom shapes. This should naturally be supported by the new renderer as a direct consequence of it reaching feature parity with the current one (unless the new renderer gets rid of Mesh from SpriteBundle, which I know it was considered in the past, but I don't know if it has been done for the new renderer).

[Nilirad]

Visually, it is quite appealing, but the code is kinda complicated.
The code for direct creation of a single shape would look much more appealing, even if (maybe) less eye catching. In that way, it would even be similar to the mesh example.

I would also prefer using a very simple shape (e.g. a triangle), to focus the attention on the topic of the example rather than the shape.

[mockersf]

Visually, it is quite appealing, but the code is kinda complicated.

Yeah I wanted it to be fun to view and not go over shapes that will be added someday in bevyengine/rfcs#12... but all the loops makes it hard to read.

I believe this is currently not supported on the new renderer. Should it be?

Oh the mesh component has been removed from the new sprite bundle so it won't be as easy to do 😞

bevy/pipelined/bevy_sprite2/src/bundle.rs

Lines 11 to 16 in 43e8a15

	pub struct PipelinedSpriteBundle {
	pub sprite: Sprite,
	pub transform: Transform,
	pub global_transform: GlobalTransform,
	pub texture: Handle<Image>,
	}

So I guess that example won't be useful anyway after the new renderer is merged

[Nilirad]

Sprites no longer have custom meshes, and now we have Mesh2D doing this job. I think this can be closed.

[IceSentry]

This is covered by the mesh2d_manual example