From 30bf3c32fcbc037505b038210e97a94d24546316 Mon Sep 17 00:00:00 2001
From: mandeep <10521687+mandeep@users.noreply.github.com>
Date: Thu, 4 Jun 2026 00:00:12 -0400
Subject: [PATCH] Add handling of the emissive material attribute Ke

---
 src/lib.rs   | 9 +++++++++
 src/tests.rs | 5 +----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index f94e3b8..f341cc5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -132,6 +132,12 @@
 //!             specular[0], specular[1], specular[2]
 //!         );
 //!     }
+//!     if let Some(emissive) = m.emissive {
+//!         println!(
+//!             "    material.Ke = ({}, {}, {})",
+//!             emissive[0], emissive[1], emissive[2]
+//!         );
+//!     }
 //!     if let Some(shininess) = m.shininess {
 //!         println!("    material.Ns = {}", shininess);
 //!     }
@@ -588,6 +594,8 @@ pub struct Material {
     pub diffuse: Option<[Float; 3]>,
     /// Specular color of the material.
     pub specular: Option<[Float; 3]>,
+    /// Emissive color of the material.
+    pub emissive: Option<[Float; 3]>,
     /// Material shininess attribute. Also called `glossiness`.
     pub shininess: Option<Float>,
     /// Dissolve attribute is the alpha term for the material. Referred to as
@@ -1811,6 +1819,7 @@ fn parse_mtl_line(
         Some("Ka") => cur_mat.ambient = Some(parse_float3(words)?),
         Some("Kd") => cur_mat.diffuse = Some(parse_float3(words)?),
         Some("Ks") => cur_mat.specular = Some(parse_float3(words)?),
+        Some("Ke") => cur_mat.emissive = Some(parse_float3(words)?),
         Some("Ns") => cur_mat.shininess = Some(parse_float(words.next())?),
         Some("Ni") => cur_mat.optical_density = Some(parse_float(words.next())?),
         Some("d") => cur_mat.dissolve = Some(parse_float(words.next())?),
diff --git a/src/tests.rs b/src/tests.rs
index 75bb520..7d9bf93 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -393,10 +393,7 @@ fn validate_cornell(models: Vec<tobj::Model>, mats: Vec<tobj::Material>) {
     assert_float_eq!(mat.ambient.unwrap(), [0.0, 0.0, 0.0], r2nd_all <= TOL);
     assert_float_eq!(mat.diffuse.unwrap(), [1.0, 1.0, 1.0], r2nd_all <= TOL);
     assert_float_eq!(mat.specular.unwrap(), [0.0, 0.0, 0.0], r2nd_all <= TOL);
-    assert_eq!(
-        mat.unknown_param.get("Ke").map(|s| s.as_ref()),
-        Some("1 1 1")
-    );
+    assert_float_eq!(mat.emissive.unwrap(), [1.0, 1.0, 1.0], r2nd_all <= TOL);
     assert_eq!(mat.illumination_model, None);
 
     // Verify red material loaded properly