Refactor material and texture classes, update builders

- Add XML docs and DiffuseFactor to Material; remove unused properties
- Improve FbxMaterialBuilder property extraction and naming
- Move TextureFilterType and WrapMode enums to separate files
- Update Texture class to use new enums and clarify property order
- Clean up GltfMaterialBuilder: remove unused method, minor logic changes

Author: DomCR

src/MeshIO/Formats/Fbx/Builders/FbxMaterialBuilder.cs

@@ -40,16 +40,26 @@ protected override void buildProperties(Dictionary<string, FbxProperty> properti
 			_element.EmissiveFactor = emissiveFactor.ToProperty().GetValue<double>();
 		}
 
-		if (properties.Remove("AmbientColor", out FbxProperty AmbientColor))
+		if (properties.Remove("AmbientColor", out FbxProperty ambientColor))
 		{
-			_element.AmbientColor = emissiveFactor.ToProperty().GetValue<Color>();
+			_element.AmbientColor = ambientColor.ToProperty().GetValue<Color>();
 		}
 
 		if (properties.Remove("AmbientFactor", out FbxProperty ambientFactor))
 		{
 			_element.AmbientFactor = ambientFactor.ToProperty().GetValue<double>();
 		}
 
+		if (properties.Remove("DiffuseColor", out FbxProperty diffuseColor))
+		{
+			_element.DiffuseColor = diffuseColor.ToProperty().GetValue<Color>();
+		}
+
+		if (properties.Remove("DiffuseFactor", out FbxProperty diffuseFactor))
+		{
+			_element.DiffuseFactor = diffuseFactor.ToProperty().GetValue<double>();
+		}
+
 		base.buildProperties(properties);
 	}
 }

src/MeshIO/Formats/Gltf/Builders/GltfMaterialBuilder.cs

@@ -17,6 +17,7 @@ public override void Build(GlbFileBuilder builder)
 
 		if (this.GltfObject.PbrMetallicRoughness != null)
 		{
+
 		}
 
 		if (this.GltfObject.NormalTexture != null
@@ -40,9 +41,4 @@ public override void Build(GlbFileBuilder builder)
 			pbrMat.EmissiveTexture = emissiveBuilder.Texture;
 		}
 	}
-
-	private Texture processTexture(GlbFileBuilder builder)
-	{
-		throw new System.NotImplementedException();
-	}
 }

src/MeshIO/Materials/Material.cs

@@ -1,5 +1,13 @@
 namespace MeshIO.Materials;
 
+/// <summary>
+/// Represents the base class for 3D materials that define the appearance of surfaces in a scene, including color and
+/// lighting properties.
+/// </summary>
+/// <remarks>The Material class provides common properties for ambient, diffuse, and emissive lighting components.
+/// Derived classes can extend this class to implement specific material behaviors or additional properties. Materials
+/// are typically assigned to 3D objects to control how they interact with light sources in the rendering
+/// environment.</remarks>
 public abstract class Material : Element3D
 {
 	public Color AmbientColor { get; set; }
@@ -8,16 +16,12 @@ public abstract class Material : Element3D
 
 	public Color DiffuseColor { get; set; }
 
+	public double DiffuseFactor { get; set; }
+
 	public Color EmissiveColor { get; set; }
 
 	public double EmissiveFactor { get; set; }
 
-	public int? MultiLayer { get; set; }
-
-	public double ShininessExponent { get; set; }
-
-	public double TransparencyFactor { get; set; }
-
 	public Material() : this(string.Empty)
 	{
 	}

src/MeshIO/Materials/Texture.cs

@@ -1,33 +1,22 @@
 namespace MeshIO.Materials;
 
-public enum TextureFilterType
-{
-	None = 0,
-
-	Nearest = 1,
-
-	Linear = 2,
-}
-
-public enum WrapMode
-{
-	Clamp = 0,
-	Repeat = 1,
-	MirroredRepeat = 2,
-}
-
 public class Texture : Element3D
 {
 	public TextureFilterType MagnificationFilter { get; set; }
+
 	public TextureFilterType MinificationFilter { get; set; }
+
 	public TextureFilterType MipFilter { get; set; }
-	public WrapMode WrapModeT {  get; set; }
-	public WrapMode WrapModeS {  get; set; }
+
+	public WrapMode WrapModeS { get; set; }
+
+	public WrapMode WrapModeT { get; set; }
+
 	public Texture() : base()
 	{
 	}
 
 	public Texture(string name) : base(name)
 	{
 	}
-}
+}

src/MeshIO/Materials/TextureFilterType.cs

@@ -0,0 +1,10 @@
+namespace MeshIO.Materials;
+
+public enum TextureFilterType
+{
+	None = 0,
+
+	Nearest = 1,
+
+	Linear = 2,
+}

src/MeshIO/Materials/WrapMode.cs

@@ -0,0 +1,10 @@
+namespace MeshIO.Materials;
+
+public enum WrapMode
+{
+	Clamp = 0,
+
+	Repeat = 1,
+
+	MirroredRepeat = 2,
+}