Commit Graph

6 Commits

Author SHA1 Message Date
Marco Buono
12a2f83edd
Add consuming builder methods for more ergonomic Mesh creation (#10056)
# Objective

- This PR aims to make creating meshes a little bit more ergonomic,
specifically by removing the need for intermediate mutable variables.

## Solution

- We add methods that consume the `Mesh` and return a mesh with the
specified changes, so that meshes can be entirely constructed via
builder-style calls, without intermediate variables;
- Methods are flagged with `#[must_use]` to ensure proper use;
- Examples are updated to use the new methods where applicable. Some
examples are kept with the mutating methods so that users can still
easily discover them, and also where the new methods wouldn't really be
an improvement.

## Examples

Before:

```rust
let mut mesh = Mesh::new(PrimitiveTopology::TriangleList);
mesh.insert_attribute(Mesh::ATTRIBUTE_POSITION, vs);
mesh.insert_attribute(Mesh::ATTRIBUTE_NORMAL, vns);
mesh.insert_attribute(Mesh::ATTRIBUTE_UV_0, vts);
mesh.set_indices(Some(Indices::U32(tris)));
mesh
```

After:

```rust
Mesh::new(PrimitiveTopology::TriangleList)
    .with_inserted_attribute(Mesh::ATTRIBUTE_POSITION, vs)
    .with_inserted_attribute(Mesh::ATTRIBUTE_NORMAL, vns)
    .with_inserted_attribute(Mesh::ATTRIBUTE_UV_0, vts)
    .with_indices(Some(Indices::U32(tris)))
```

Before:

```rust
let mut cube = Mesh::from(shape::Cube { size: 1.0 });

cube.generate_tangents().unwrap();

PbrBundle {
    mesh: meshes.add(cube),
    ..default()
}
```

After:

```rust
PbrBundle {
    mesh: meshes.add(
        Mesh::from(shape::Cube { size: 1.0 })
            .with_generated_tangents()
            .unwrap(),
    ),
    ..default()
}
```

---

## Changelog

- Added consuming builder methods for more ergonomic `Mesh` creation:
`with_inserted_attribute()`, `with_removed_attribute()`,
`with_indices()`, `with_duplicated_vertices()`,
`with_computed_flat_normals()`, `with_generated_tangents()`,
`with_morph_targets()`, `with_morph_target_names()`.
2023-10-09 19:47:41 +00:00
Rob Parrett
7063c86ed4
Fix some typos (#9934)
# Objective

To celebrate the turning of the seasons, I took a small walk through the
codebase guided by the "[code spell
checker](https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker)"
VS Code extension and fixed a few typos.
2023-09-26 19:46:24 +00:00
Jakob Hellermann
1ff4b98755
fix new clippy lints before they reach stable (#8700)
# Objective

- fix clippy lints early to make sure CI doesn't break when they get
promoted to stable
- have a noise-free `clippy` experience for nightly users

## Solution

- `cargo clippy --fix`
- replace `filter_map(|x| x.ok())` with `map_while(|x| x.ok())` to fix
potential infinite loop in case of IO error
2023-05-29 07:23:50 +00:00
François
8ec4b99a69
standardize instructions in examples (#8478)
# Objective

- Standardize on screen instructions in examples:
  - top left, bottom left when better
  - white, black when better
  - same margin (12px) and font size (20)

## Solution

- Started with a few examples, let's reach consensus then document and
open issues for the rest
2023-04-26 19:52:31 +00:00
François
e0e5f3acd4
add a default font (#8445)
# Objective

- Have a default font

## Solution

- Add a font based on FiraMono containing only ASCII characters and use
it as the default font
- It is behind a feature `default_font` enabled by default
- I also updated examples to use it, but not UI examples to still show
how to use a custom font

---

## Changelog

* If you display text without using the default handle provided by
`TextStyle`, the text will be displayed
2023-04-21 22:30:18 +00:00
Nicola Papale
8df014fbaf
Add parallax mapping to bevy PBR (#5928)
# Objective

Add a [parallax mapping] shader to bevy. Please note that
this is a 3d technique, NOT a 2d sidescroller feature.

## Solution

- Add related fields to `StandardMaterial`
- update the pbr shader
- Add an example taking advantage of parallax mapping

A pre-existing implementation exists at:
https://github.com/nicopap/bevy_mod_paramap/

The implementation is derived from:

https://web.archive.org/web/20150419215321/http://sunandblackcat.com/tipFullView.php?l=eng&topicid=28

Further discussion on literature is found in the `bevy_mod_paramap`
README.

### Limitations

- The mesh silhouette isn't affected by the depth map.
- The depth of the pixel does not reflect its visual position, resulting
  in artifacts for depth-dependent features such as fog or SSAO
- GLTF does not define a height map texture, so somehow the user will
  always need to work around this limitation, though [an extension is in
  the works][gltf]

### Future work

- It's possible to update the depth in the depth buffer to follow the
  parallaxed texture. This would enable interop with depth-based
  visual effects, it also allows `discard`ing pixels of materials when
  computed depth is higher than the one in depth buffer
- Cheap lower quality single-sample method using [offset limiting]
- Add distance fading, to disable parallaxing (relatively expensive)
  on distant objects
- GLTF extension to allow defining height maps. Or a workaround
  implemented through a blender plugin to the GLTF exporter that
  uses the `extras` field to add height map.
- [Quadratic surface vertex attributes][oliveira_3] to enable parallax
  mapping on bending surfaces and allow clean silhouetting.
- noise based sampling, to limit the pancake artifacts.
- Cone mapping ([GPU gems], [Simcity (2013)][simcity]). Requires
  preprocessing, increase depth map size, reduces sample count greatly.
- [Quadtree parallax mapping][qpm] (also requires preprocessing)
- Self-shadowing of parallax-mapped surfaces by modifying the shadow map
- Generate depth map from normal map [link to slides], [blender
question]


https://user-images.githubusercontent.com/26321040/223563792-dffcc6ab-70e8-4ff9-90d1-b36c338695ad.mp4

[blender question]:
https://blender.stackexchange.com/questions/89278/how-to-get-a-smooth-curvature-map-from-a-normal-map
[link to slides]:
https://developer.download.nvidia.com/assets/gamedev/docs/nmap2displacement.pdf
[oliveira_3]:
https://www.inf.ufrgs.br/~oliveira/pubs_files/Oliveira_Policarpo_RP-351_Jan_2005.pdf
[GPU gems]:
https://developer.nvidia.com/gpugems/gpugems3/part-iii-rendering/chapter-18-relaxed-cone-stepping-relief-mapping
[simcity]:
https://community.simtropolis.com/omnibus/other-games/building-and-rendering-simcity-2013-r247/
[offset limiting]:
https://raw.githubusercontent.com/marcusstenbeck/tncg14-parallax-mapping/master/documents/Parallax%20Mapping%20with%20Offset%20Limiting%20-%20A%20Per-Pixel%20Approximation%20of%20Uneven%20Surfaces.pdf
[gltf]: https://github.com/KhronosGroup/glTF/pull/2196
[qpm]:
https://www.gamedevs.org/uploads/quadtree-displacement-mapping-with-height-blending.pdf

---

## Changelog

- Add a `depth_map` field to the `StandardMaterial`, it is a grayscale
  image where white represents bottom and black the top. If `depth_map`
  is set, bevy's pbr shader will use it to do [parallax mapping] to
  give an increased feel of depth to the material. This is similar to a
  displacement map, but with infinite precision at fairly low cost.
- The fields `parallax_mapping_method`, `parallax_depth_scale` and
  `max_parallax_layer_count` allow finer grained control over the
  behavior of the parallax shader.
- Add the `parallax_mapping` example to show off the effect.

[parallax mapping]: https://en.wikipedia.org/wiki/Parallax_mapping

---------

Co-authored-by: Robert Swain <robert.swain@gmail.com>
2023-04-15 10:25:14 +00:00