library: scene: mesh: parse emitted light from MTL

pathtracer/Cargo.toml

@@ -28,7 +28,6 @@ rand = "0.7"
 rayon = "1.3.0"
 serde_yaml = "0.8"
 structopt = "0.3"
-tobj = "1.0"
 
 [dependencies.nalgebra]
 version = "0.20.0"
@@ -37,3 +36,7 @@ features = ["serde-serialize"]
 [dependencies.serde]
 version = "1.0"
 features = ["derive"]
+
+[dependencies.tobj]
+git = "https://github.com/alarsyo/tobj" # forked for Ke support
+rev = "82b5c2ca"

pathtracer/src/scene/mesh.rs

@@ -97,6 +97,7 @@ impl TryFrom<Wavefront> for Mesh {
 
                         let diffuse = LinearColor::from_slice(&mesh_mat.ambient[..]);
                         let specular = LinearColor::from_slice(&mesh_mat.ambient[..]);
+                        let emitted = LinearColor::from_slice(&mesh_mat.emission[..]);
 
                         let material = UniformMaterial::new(LightProperties::new(
                             diffuse.clone(),
@@ -104,8 +105,7 @@ impl TryFrom<Wavefront> for Mesh {
                             // FIXME: material.dissolve is supposed to be "the alpha term"
                             // Needs translation to our ReflTransEnum
                             None,
-                            // FIXME: parse 'Ke' component for emitted light
-                            LinearColor::black(),
+                            emitted,
                         ));
 
                         // we only handle uniform textures