Merge pull request #467 from Hultan/obj_loading

Example fixed models/obj_loading

examples/models/obj_loading/main.go

@@ -1,9 +1,22 @@
 package main
 
 import (
+	"path/filepath"
+	"slices"
+	"unsafe"
+
 	"github.com/gen2brain/raylib-go/raylib"
 )
 
+var supportedFileTypes = []string{
+	".obj",
+	".gltf",
+	".glb",
+	".vox",
+	".iqm",
+	".m3d",
+}
+
 func main() {
 	screenWidth := int32(800)
 	screenHeight := int32(450)
@@ -24,26 +37,75 @@ func main() {
 
 	position := rl.NewVector3(0.0, 0.0, 0.0) // Set model position
 
+	meshes := unsafe.Slice(obj.Meshes, obj.MeshCount)
+	bounds := rl.GetMeshBoundingBox(meshes[0]) // Set model bounds
+
+	selected := false
+
+	rl.DisableCursor()
 	rl.SetTargetFPS(60)
 
 	for !rl.WindowShouldClose() {
+		// Update
+		rl.UpdateCamera(&camera, rl.CameraFirstPerson)
+
+		// Load new models/textures on drag&drop
+		if rl.IsFileDropped() {
+			droppedFiles := rl.LoadDroppedFiles()
+
+			if len(droppedFiles) == 1 { // Only support one file dropped
+				if slices.Contains(supportedFileTypes, filepath.Ext(droppedFiles[0])) { // Model file formats supported
+					rl.UnloadModel(obj)                                          // Unload previous model
+					obj = rl.LoadModel(droppedFiles[0])                          // Load new model
+					rl.SetMaterialTexture(obj.Materials, rl.MapDiffuse, texture) // Set current map diffuse texture
+
+					meshes = unsafe.Slice(obj.Meshes, obj.MeshCount)
+					bounds = rl.GetMeshBoundingBox(meshes[0])
+
+					// TODO: Move camera position from target enough distance to visualize model properly
+				} else if filepath.Ext(droppedFiles[0]) == ".png" { // Texture file formats supported
+					// Unload current model texture and load new one
+					rl.UnloadTexture(texture)
+					texture = rl.LoadTexture(droppedFiles[0])
+					rl.SetMaterialTexture(obj.Materials, rl.MapDiffuse, texture) // Set current map diffuse texture
+				}
+			}
+
+			rl.UnloadDroppedFiles() // Unload file paths from memory
+		}
+
+		// Select model on mouse click
+		if rl.IsMouseButtonPressed(rl.MouseButtonLeft) {
+			// Check collision between ray and box
+			if rl.GetRayCollisionBox(rl.GetMouseRay(rl.GetMousePosition(), camera), bounds).Hit {
+				selected = !selected
+			} else {
+				selected = false
+			}
+		}
+
 		rl.BeginDrawing()
-
 		rl.ClearBackground(rl.RayWhite)
-
 		rl.BeginMode3D(camera)
 
 		rl.DrawModel(obj, position, 1.0, rl.White) // Draw 3d model with texture
+		rl.DrawGrid(20, 10.0)                      // Draw a grid
 
-		rl.DrawGrid(20, 10.0) // Draw a grid
+		if selected {
+			rl.DrawBoundingBox(bounds, rl.Green) // Draw selection box
+		}
 
 		rl.EndMode3D()
 
+		rl.DrawText("Drag & drop model to load mesh/texture", 10, screenHeight-20, 10, rl.Gray)
+		if selected {
+			rl.DrawText("Model selected!", screenWidth-110, 10, 10, rl.Green)
+		}
 		rl.DrawText("(c) Castle 3D model by Alberto Cano", screenWidth-200, screenHeight-20, 10, rl.Gray)
 
+		rl.DrawFPS(10, 10)
 		rl.EndDrawing()
 	}
-
 	rl.UnloadTexture(texture) // Unload texture
 	rl.UnloadModel(obj)       // Unload model