Properly create and apply color based model materials

project/code/TMV/Model.cs

@@ -1,8 +1,6 @@
-using System;
 using System.Collections.Generic;
 using System.IO;
 using Godot;
-using Godot.Collections;
 using KeepersCompound.LGS;
 using KeepersCompound.TMV.UI;
 
@@ -37,25 +35,34 @@ public partial class Model : Node3D
             MatchCasing = MatchCasing.CaseInsensitive,
             RecurseSubdirectories = true,
         };
-        var textures = new List<ImageTexture>();
+        var materials = new List<StandardMaterial3D>();
         foreach (var material in modelFile.Materials)
+        {
+            if (material.Type == 0)
             {
                 var paths = Directory.GetFiles(baseDir, material.Name, options);
                 if (paths.IsEmpty()) continue;
 
-            var texture = TextureLoader.LoadTexture(paths[0]);
+                materials.Add(new StandardMaterial3D
-            var saveName = material.Name.GetBaseName() + ".png";
+                {
-            texture.GetImage().SavePng(ProjectSettings.GlobalizePath($"user://debug/{saveName}"));
+                    AlbedoTexture = TextureLoader.LoadTexture(paths[0])
-            textures.Add(texture);
+                });
+            }
+            else
+            {
+                var b = (material.Handle) & 0xff;
+                var g = (material.Handle >> 8) & 0xff;
+                var r = (material.Handle >> 16) & 0xff;
+                GD.Print($"Handle: {material.Handle}, R: {r}, G: {g}, B: {b}");
+                var colour = new Color(r / 255.0f, g / 255.0f, b / 255.0f, 1.0f);
+                materials.Add(new StandardMaterial3D
+                {
+                    AlbedoColor = colour
+                });
+            }
         }
 
-        var mat = new StandardMaterial3D
+        var mesh = new ArrayMesh();
-        {
-            AlbedoTexture = textures[0]
-        };
-
-        // TODO: Support multiple materials and colour based materials
-        var surfaceData = new MeshSurfaceData();
         foreach (var poly in modelFile.Polygons)
         {
             var vertices = new List<Vector3>();
@@ -72,26 +79,25 @@ public partial class Model : Node3D
                 }
                 else
                 {
-                    var uv = (i % 4) switch
+                    uvs.Add(Vector2.Zero);
-                    {
+                }
-                        0 => new Vector2(0, 0),
-                        1 => new Vector2(0, 1),
-                        2 => new Vector2(1, 0),
-                        3 => new Vector2(1, 1),
-                        _ => throw new NotImplementedException(),
-                    };
-                    uvs.Add(uv);
-                }
-
             }
 
+            var surfaceData = new MeshSurfaceData();
             surfaceData.AddPolygon(vertices, normal, uvs, uvs);
-        }
             var array = surfaceData.BuildSurfaceArray();
-
-        var mesh = new ArrayMesh();
             mesh.AddSurfaceFromArrays(Mesh.PrimitiveType.Triangles, array);
-        mesh.SurfaceSetMaterial(0, mat);
+
+            for (var i = 0; i < materials.Count; i++)
+            {
+                var m = modelFile.Materials[i];
+                if (m.Slot == poly.Data)
+                {
+                    mesh.SurfaceSetMaterial(poly.Index, materials[i]);
+                    break;
+                }
+            }
+        }
 
         var meshInstance = new MeshInstance3D { Mesh = mesh };
         AddChild(meshInstance);