diff --git a/Sources/Assimp/AiMatKey.swift b/Sources/Assimp/AiMatKey.swift
index f98cbef..7bb7967 100644
--- a/Sources/Assimp/AiMatKey.swift
+++ b/Sources/Assimp/AiMatKey.swift
@@ -14,9 +14,7 @@ public struct AiMatKey: RawRepresentable {
     public let rawValue: String
 
     init(base: Base, texType: AiTextureType = .none, texIndex: Int = 0) {
-        self.rawValue = base.rawValue.withCString { basePtr -> String in
-           return String(format: "%@,%d,%d", basePtr, texType.rawValue, texIndex)
-        }
+        self.rawValue = "\(base.rawValue),\(texType.rawValue),\(texIndex)"
         self.baseName = base.rawValue
         self.texType = texType.rawValue
         self.texIndex = UInt32(texIndex)
diff --git a/Tests/AssimpTests/AssimpTests.swift b/Tests/AssimpTests/AssimpTests.swift
index a3011a0..286b4a3 100644
--- a/Tests/AssimpTests/AssimpTests.swift
+++ b/Tests/AssimpTests/AssimpTests.swift
@@ -71,7 +71,7 @@ final class AssimpTests: XCTestCase {
         XCTAssertEqual(scene.meshes[0].numFaces, 2144)
         XCTAssertEqual(scene.meshes[0].numBones, 0)
         XCTAssertEqual(scene.meshes[0].numAnimMeshes, 0)
-
+        
         // Faces
 
         XCTAssertEqual(scene.meshes[0].numFaces, 2144)
@@ -100,7 +100,11 @@ final class AssimpTests: XCTestCase {
         // Cameras
 
         XCTAssertEqual(scene.cameras.count, 1)
-
+        
+        print(scene.materials.map { $0.debugDescription })
+        
+        XCTAssertEqual(scene.materials[0].getMaterialColor(.COLOR_DIFFUSE), SIMD4<Float>(1.0, 1.0, 1.0, 1.0))
+        XCTAssertEqual(scene.materials[0].getMaterialString(.TEXTURE(.diffuse, 0)), "./duckCM.tga")
     }
 
     func testLoadAiSceneObj() throws {
@@ -237,6 +241,9 @@ final class AssimpTests: XCTestCase {
         // Cameras
 
         XCTAssertEqual(scene.cameras.count, 0)
+        
+        XCTAssertEqual(scene.materials[0].getMaterialColor(.COLOR_DIFFUSE), SIMD4<Float>(0.5882353, 0.5882353, 0.5882353, 1.0))
+        XCTAssertEqual(scene.materials[0].getMaterialString(.TEXTURE(.diffuse, 0)), "TEST.PNG")
 
     }
 }