Nice

src/model/mod.rs

@@ -23,13 +23,14 @@ use renderer::Renderer;
 #[derive(Copy, Clone, Debug, PartialEq)]
 /// A raw vertex, with its 3D coordinates, texture coordinates and normals.
 pub struct Vertex {
-    vertex:     [f64; 3],
-    tex_coords: [f64; 2],
-    normal:     [f64; 3],
-    face_color: [f64; 3],
+    vertex:      [f64; 3],
+    tex_coords:  [f64; 2],
+    normal:      [f64; 3],
+    barycentric: [f64; 3],
+    face_color:  [f64; 3],
 }
 
-implement_vertex!(Vertex, vertex, tex_coords, normal, face_color);
+implement_vertex!(Vertex, vertex, tex_coords, normal, barycentric, face_color);
 
 /// A part of a 3D model.
 ///
@@ -534,7 +535,12 @@ impl Model {
 
         let mut vertex_buffer = vec![];
         for face in part.faces() {
-            for &&v in &[&face.a, &face.b, &face.c] {
+            let v0 = vertices[face.a.vertex];
+            let v1 = vertices[face.b.vertex];
+            let v2 = vertices[face.c.vertex];
+            let barycenter = (v0 + v1 + v2) / 3.0;
+
+            for (index, &&v) in [&face.a, &face.b, &face.c].iter().enumerate() {
                 let vertex = vertices[v.vertex].into();
                 let tex_coord = if let Some(tex_index) = v.texture_coordinate {
                     texture_coordinates[tex_index].into()
@@ -542,6 +548,14 @@ impl Model {
                     [0.0, 0.0]
                 };
 
+
+                let barycentric = match index {
+                    0 => [1.0, 0.0, 0.0],
+                    1 => [0.0, 1.0, 0.0],
+                    2 => [0.0, 0.0, 1.0],
+                    _ => unreachable!(),
+                };
+
                 let normal = if let Some(normal_index) = v.normal {
                     normals[normal_index].into()
                 } else {
@@ -564,10 +578,11 @@ impl Model {
                 ];
 
                 vertex_buffer.push(Vertex {
-                    vertex:     vertex,
-                    tex_coords: tex_coord,
-                    normal:     normal,
-                    face_color: [r, g, b],
+                    vertex:      vertex,
+                    tex_coords:  tex_coord,
+                    normal:      normal,
+                    barycentric: barycentric,
+                    face_color:  [r, g, b],
                 });
             }
         }

src/programs/viewer.rs

@@ -131,6 +131,7 @@ fn main() {
     let context = glutin::ContextBuilder::new().with_depth_buffer(24);
     let display = Display::new(window, context, &events_loop).unwrap();
     let mut renderer = Renderer::new(display);
+    renderer.set_clear_color(1.0, 1.0, 1.0, 1.0);
 
     let mut scene = Scene::new();
     let mut before;