Add optional solid/filled (triangle mesh) rendering to Boxes3D and Ellipsoids.

crates/store/re_types/definitions/rerun/archetypes/boxes3d.fbs

@@ -26,8 +26,11 @@ table Boxes3D (
   /// Optional rotations of the boxes.
   rotations: [rerun.components.Rotation3D] ("attr.rerun.component_recommended", nullable, order: 2100);
 
-  /// Optional colors for the boxes.
-  colors: [rerun.components.Color] ("attr.rerun.component_recommended", nullable, order: 2200);
+  /// Optional colors for the boxes' surfaces.
+  solid_colors: [rerun.components.SolidColor] ("attr.rerun.component_recommended", nullable, order: 2200);
+
+  /// Optional colors for the lines that make up the boxes.
+  colors: [rerun.components.Color] ("attr.rerun.component_recommended", nullable, order: 2300);
 
   // --- Optional ---
 

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

@@ -39,8 +39,15 @@ table Ellipsoids (
   /// If not specified, the axes of the ellipsoid align with the axes of the coordinate system.
   rotations: [rerun.components.Rotation3D] ("attr.rerun.component_recommended", nullable, order: 2100);
 
-  /// Optional colors for the ellipsoids.
-  colors: [rerun.components.Color] ("attr.rerun.component_recommended", nullable, order: 2200);
+  /// Optional colors for the ellipsoids' surfaces.
+  ///
+  /// This color may be transparent to render the ellipsoid as a wireframe alone.
+  solid_colors: [rerun.components.SolidColor] ("attr.rerun.component_recommended", nullable, order: 2200);
+
+  /// Optional colors for the ellipsoids' wireframe lines.
+  ///
+  /// This color may be transparent to render the ellipsoid as a colored surface alone.
+  line_colors: [rerun.components.Color] ("attr.rerun.component_recommended", nullable, order: 2300);
 
   // --- Optional ---
 

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

@@ -0,0 +1,19 @@
+namespace rerun.components;
+
+// ---
+
+/// An RGBA color for the surface of an object.
+///
+/// In representation and color space, this is identical to [components.Color].
+/// Unlike that component, it is used specifically to request that this color should be
+/// applied to the entire surface of the object (as opposed to the lines of a wireframe).
+table SolidColor (
+  "attr.arrow.transparent",
+  "attr.python.aliases": "int, Sequence[int], npt.NDArray[Union[np.uint8, np.float32, np.float64]]",
+  "attr.python.array_aliases": "int, Sequence[Sequence[int]], npt.NDArray[Union[np.uint8, np.uint32, np.float32, np.float64]]",
+  "attr.rust.derive": "Copy, PartialEq, Eq, PartialOrd, Ord, bytemuck::Pod, bytemuck::Zeroable",
+  "attr.rust.repr": "transparent",
+  "attr.docs.unreleased"
+) {
+  rgba: rerun.datatypes.Rgba32 (order: 100);
+}