Rename Material component to AlbedoFactor (#6841)

### What
* Closes #6829

⚠️ This is a breaking change!

This renames the `Material` component to `AlbedoFactor`, which now
simply wraps a `datatypes.Rgba32`.

Consequently, the field `mesh_material` in `Mesh3D` is now named
`albedo_factor`

When constructing a `Mesh3D`:
* C++ & Rust: `.with_mesh_material(Material::from_albedo_factor(color))`
-> `with_albedo_factor(color)`
* Python: `mesh_material=rr.Material(albedo_factor=color)` ->
`albedo_factor=color`

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/6841?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/6841?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
* [x] I have run the `raw_mesh` examples
* [x] I have asked for a final `@rerun-bot full-check` and checked the
results

- [PR Build Summary](https://build.rerun.io/pr/6841)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

To run all checks from `main`, comment on the PR with `@rerun-bot
full-check`.

.github/pull_request_template.md

@@ -20,6 +20,7 @@ To get an auto-generated PR description you can put "copilot:summary" or "copilo
   * Using full set of examples from `nightly` build: [rerun.io/viewer](https://rerun.io/viewer/pr/{{pr.number}}?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
 * [ ] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
 * [ ] If applicable, add a new check to the [release checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
+* [ ] If have noted any breaking changes to the log API in `CHANGELOG.md` and the migration guide
 
 - [PR Build Summary](https://build.rerun.io/pr/{{pr.number}})
 - [Recent benchmark results](https://build.rerun.io/graphs/crates.html)

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased](https://github.com/rerun-io/rerun/compare/latest...HEAD)
 
+# ⚠️ Breaking changes
+* `mesh_material: Material` has been renamed to `albedo_factor: AlbedoFactor` [#6841](https://github.com/rerun-io/rerun/pull/6841)
+
 
 ## [0.17.0](https://github.com/rerun-io/rerun/compare/0.16.1...0.17.0) - More Blueprint features and better notebooks - 2024-07-08
 

crates/store/re_types/Cargo.toml

@@ -22,7 +22,7 @@ features = ["all"]
 
 
 [features]
-default = []
+default = ["ecolor"]
 
 ## All features except `testing`.
 all = ["ecolor", "egui_plot", "glam", "image", "mint", "serde"]

crates/store/re_types/definitions/rerun/archetypes/mesh3d.fbs

@@ -42,8 +42,8 @@ table Mesh3D (
   /// An optional uv texture coordinate for each vertex.
   vertex_texcoords: [rerun.components.Texcoord2D] ("attr.rerun.component_optional", nullable, order: 3200);
 
-  /// Optional material properties for the mesh as a whole.
-  mesh_material: rerun.components.Material ("attr.rerun.component_optional", nullable, order: 3300);
+  /// A color multiplier applied to the whole mesh.
+  albedo_factor: rerun.components.AlbedoFactor ("attr.rerun.component_optional", nullable, order: 3300);
 
   /// Optional albedo texture.
   ///

crates/store/re_types/definitions/rerun/components.fbs

@@ -1,4 +1,5 @@
 include "./components/aggregation_policy.fbs";
+include "./components/albedo_factor.fbs";
 include "./components/annotation_context.fbs";
 include "./components/axis_length.fbs";
 include "./components/blob.fbs";
@@ -20,7 +21,6 @@ include "./components/line_strip3d.fbs";
 include "./components/magnification_filter.fbs";
 include "./components/marker_shape.fbs";
 include "./components/marker_size.fbs";
-include "./components/material.fbs";
 include "./components/media_type.fbs";
 include "./components/name.fbs";
 include "./components/opacity.fbs";

crates/store/re_types/definitions/rerun/components/albedo_factor.fbs

@@ -0,0 +1,20 @@
+include "arrow/attributes.fbs";
+include "python/attributes.fbs";
+include "rust/attributes.fbs";
+
+include "rerun/datatypes.fbs";
+include "rerun/attributes.fbs";
+
+namespace rerun.components;
+
+// ---
+
+/// A color multiplier, usually applied to a whole entity, e.g. a mesh.
+table AlbedoFactor (
+  "attr.docs.unreleased",
+  "attr.rust.derive": "Copy, PartialEq, Eq, PartialOrd, Ord, Hash, bytemuck::Pod, bytemuck::Zeroable",
+  "attr.rust.repr": "transparent"
+) {
+  albedo_factor: rerun.datatypes.Rgba32 (order: 100);
+}
+

crates/store/re_types/definitions/rerun/datatypes.fbs

@@ -12,7 +12,6 @@ include "./datatypes/keypoint_id.fbs";
 include "./datatypes/keypoint_pair.fbs";
 include "./datatypes/mat3x3.fbs";
 include "./datatypes/mat4x4.fbs";
-include "./datatypes/material.fbs";
 include "./datatypes/quaternion.fbs";
 include "./datatypes/range1d.fbs";
 include "./datatypes/range2d.fbs";

crates/store/re_types/src/components/albedo_factor_ext.rs

@@ -0,0 +1,10 @@
+use crate::datatypes::Rgba32;
+
+use super::AlbedoFactor;
+
+impl Default for AlbedoFactor {
+    #[inline]
+    fn default() -> Self {
+        Self(Rgba32::WHITE)
+    }
+}