Update/merge examples back into main repo (#192)

Examples/Models/ModelLoading.cs

@@ -0,0 +1,157 @@
+/*******************************************************************************************
+*
+*   raylib [models] example - Models loading
+*
+*   raylib supports multiple models file formats:
+*
+*     - OBJ > Text file, must include vertex position-texcoords-normals information,
+*             if files references some .mtl materials file, it will be loaded (or try to)
+*     - GLTF > Modern text/binary file format, includes lot of information and it could
+*              also reference external files, raylib will try loading mesh and materials data
+*     - IQM > Binary file format including mesh vertex data but also animation data,
+*             raylib can load .iqm animations.
+*
+*   This example has been created using raylib 2.6 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Models;
+
+public class ModelLoading
+{
+    public unsafe static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        InitWindow(screenWidth, screenHeight, "raylib [models] example - models loading");
+
+        // Define the camera to look into our 3d world
+        Camera3D camera = new();
+        camera.Position = new Vector3(50.0f, 50.0f, 50.0f);
+        camera.Target = new Vector3(0.0f, 10.0f, 0.0f);
+        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
+        camera.FovY = 45.0f;
+        camera.Projection = CameraProjection.CAMERA_PERSPECTIVE;
+
+        Model model = LoadModel("resources/models/obj/castle.obj");
+        Texture2D texture = LoadTexture("resources/models/obj/castle_diffuse.png");
+
+        // Set map diffuse texture
+        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.MATERIAL_MAP_ALBEDO, ref texture);
+
+        Vector3 position = new(0.0f, 0.0f, 0.0f);
+        BoundingBox bounds = GetMeshBoundingBox(model.Meshes[0]);
+
+        // NOTE: bounds are calculated from the original size of the model,
+        // if model is scaled on drawing, bounds must be also scaled
+
+        bool selected = false;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            UpdateCamera(ref camera, CameraMode.CAMERA_FREE);
+
+            if (IsFileDropped())
+            {
+                string[] files = Raylib.GetDroppedFiles();
+
+                if (files.Length == 1)
+                {
+                    if (IsFileExtension(files[0], ".obj") ||
+                        IsFileExtension(files[0], ".gltf") ||
+                        IsFileExtension(files[0], ".iqm")
+                    )
+                    {
+                        UnloadModel(model);
+                        model = LoadModel(files[0]);
+
+                        // Set current map diffuse texture
+                        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.MATERIAL_MAP_ALBEDO, ref texture);
+
+                        bounds = GetMeshBoundingBox(model.Meshes[0]);
+
+                        // TODO: Move camera position from target enough distance to visualize model properly
+                    }
+                    else if (IsFileExtension(files[0], ".png"))
+                    {
+                        // Unload model texture and load new one
+                        UnloadTexture(texture);
+                        texture = LoadTexture(files[0]);
+                        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.MATERIAL_MAP_ALBEDO, ref texture);
+                    }
+                }
+            }
+
+            // Select model on mouse click
+            if (IsMouseButtonPressed(MouseButton.MOUSE_LEFT_BUTTON))
+            {
+                // Check collision between ray and box
+                if (GetRayCollisionBox(GetMouseRay(GetMousePosition(), camera), bounds).Hit)
+                {
+                    selected = !selected;
+                }
+                else
+                {
+                    selected = false;
+                }
+            }
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            BeginMode3D(camera);
+
+            DrawModel(model, position, 1.0f, Color.WHITE);
+
+            DrawGrid(20, 10.0f);
+
+            if (selected)
+            {
+                DrawBoundingBox(bounds, Color.GREEN);
+            }
+
+            EndMode3D();
+
+            DrawText("Drag & drop model to load mesh/texture.", 10, GetScreenHeight() - 20, 10, Color.DARKGRAY);
+            if (selected)
+            {
+                DrawText("MODEL SELECTED", GetScreenWidth() - 110, 10, 10, Color.GREEN);
+            }
+
+            DrawText("(c) Castle 3D model by Alberto Cano", screenWidth - 200, screenHeight - 20, 10, Color.GRAY);
+
+            DrawFPS(10, 10);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadTexture(texture);
+        UnloadModel(model);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}