Add color model

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "crates/fj-window",
 
     "models/all",
+    "models/color",
     "models/cuboid",
     "models/holes",
     "models/spacer",

models/color/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "color"
+version = "0.1.0"
+edition = "2021"
+
+
+[dependencies.cuboid]
+path = "../cuboid"
+
+[dependencies.fj]
+path = "../../crates/fj"

models/color/src/lib.rs

@@ -0,0 +1,35 @@
+use fj::{
+    core::{
+        objects::{Region, Solid},
+        operations::{
+            insert::Insert,
+            update::{UpdateFace, UpdateShell, UpdateSolid},
+        },
+        services::Services,
+        storage::Handle,
+    },
+    interop::Color,
+};
+
+pub fn model(services: &mut Services) -> Handle<Solid> {
+    let size = 1.;
+    let cuboid = cuboid::model([size, size, size], services);
+
+    cuboid
+        .update_shell(cuboid.shells().only(), |shell| {
+            shell
+                .update_face(shell.faces().first(), |face| {
+                    face.update_region(|region| {
+                        Region::new(
+                            region.exterior().clone(),
+                            region.interiors().into_iter().cloned(),
+                            Some(Color::from([0., 1., 0.])),
+                        )
+                        .insert(services)
+                    })
+                    .insert(services)
+                })
+                .insert(services)
+        })
+        .insert(services)
+}

models/color/src/main.rs

@@ -0,0 +1,8 @@
+use fj::{core::services::Services, handle_model};
+
+fn main() -> fj::Result {
+    let mut services = Services::new();
+    let model = color::model(&mut services);
+    handle_model(model, services)?;
+    Ok(())
+}