New example models/m3d_loading

examples/models/m3d_loading/main.go

@@ -0,0 +1,156 @@
+/*******************************************************************************************
+*
+*   raylib [models] example - Load models M3D
+*
+*   Example originally created with raylib 4.5, last time updated with raylib 4.5
+*
+*   Example contributed by bzt (@bztsrc) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   NOTES:
+*     - Model3D (M3D) fileformat specs: https://gitlab.com/bztsrc/model3d
+*     - Bender M3D exported: https://gitlab.com/bztsrc/model3d/-/tree/master/blender
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2022-2024 bzt (@bztsrc)
+*
+********************************************************************************************/
+package main
+
+import (
+	"unsafe"
+
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+const (
+	screenWidth  = 800
+	screenHeight = 450
+)
+
+func main() {
+	// Initialization
+	rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - M3D model loading")
+
+	// Define the camera to look into our 3d world
+	camera := rl.Camera{
+		Position:   rl.NewVector3(1.5, 1.5, 1.5),
+		Target:     rl.NewVector3(0.0, 0.4, 0.0),
+		Up:         rl.NewVector3(0.0, 1.0, 0.0),
+		Fovy:       45.0,
+		Projection: rl.CameraPerspective,
+	}
+
+	position := rl.NewVector3(0.0, 0.0, 0.0)
+
+	modelFileName := "cesium_man.m3d"
+	drawMesh := true
+	drawSkeleton := true
+	animPlaying := false // Store anim state, what to draw
+
+	// Load model
+	model := rl.LoadModel(modelFileName)
+
+	// Load animations
+
+	animFrameCounter := 0
+	animID := 0
+	anims := rl.LoadModelAnimations(modelFileName)
+	animsCount := int32(len(anims))
+
+	rl.DisableCursor()
+	rl.SetTargetFPS(60)
+
+	// Main game loop
+	for !rl.WindowShouldClose() {
+		// Update
+		rl.UpdateCamera(&camera, rl.CameraFirstPerson)
+
+		if animsCount > 0 {
+			// Play animation when space bar is held down (or step one frame with N)
+			if rl.IsKeyDown(rl.KeySpace) || rl.IsKeyPressed(rl.KeyN) {
+				animFrameCounter++
+				if animFrameCounter >= int(anims[animID].FrameCount) {
+					animFrameCounter = 0
+				}
+				rl.UpdateModelAnimation(model, anims[animID], int32(animFrameCounter))
+				animPlaying = true
+			}
+
+			// Select animation by pressing C
+			if rl.IsKeyPressed(rl.KeyC) {
+				animFrameCounter = 0
+				animID++
+				if animID >= int(animsCount) {
+					animID = 0
+				}
+				rl.UpdateModelAnimation(model, anims[animID], 0)
+				animPlaying = true
+			}
+		}
+
+		// Toggle skeleton drawing
+		if rl.IsKeyPressed(rl.KeyB) {
+			drawSkeleton = !drawSkeleton
+		}
+
+		// Toggle mesh drawing
+		if rl.IsKeyPressed(rl.KeyM) {
+			drawMesh = !drawMesh
+		}
+
+		// Draw
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		// Draw 3d model with texture
+		if drawMesh {
+			rl.DrawModel(model, position, 1.0, rl.White)
+		}
+
+		// Draw the animated skeleton
+		if drawSkeleton {
+			modelBones := model.GetBones()
+			modelPoses := model.GetBindPose()
+			animBones := unsafe.Slice(anims[animID].Bones, anims[animID].BoneCount)
+			animPoses := unsafe.Slice(anims[animID].FramePoses, anims[animID].FrameCount)
+			transforms := unsafe.Slice(animPoses[animFrameCounter], anims[animID].BoneCount)
+			for bone := 0; bone < int(model.BoneCount)-1; bone++ {
+				if !animPlaying || animsCount == 0 {
+					// Display the bind-pose skeleton
+					rl.DrawCube(modelPoses[bone].Translation, 0.04, 0.04, 0.04, rl.Red)
+					if modelBones[bone].Parent >= 0 {
+						rl.DrawLine3D(modelPoses[bone].Translation, modelPoses[modelBones[bone].Parent].Translation, rl.Red)
+					}
+				} else {
+					// // Display the frame-pose skeleton
+					rl.DrawCube(transforms[bone].Translation, 0.05, 0.05, 0.05, rl.Red)
+					if animBones[bone].Parent >= 0 {
+						rl.DrawLine3D(transforms[bone].Translation, transforms[animBones[bone].Parent].Translation, rl.Red)
+					}
+				}
+			}
+		}
+
+		rl.DrawGrid(10, 1.0)
+
+		rl.EndMode3D()
+
+		rl.DrawText("PRESS SPACE to PLAY MODEL ANIMATION", 10, screenHeight-80, 10, rl.Maroon)
+		rl.DrawText("PRESS N to STEP ONE ANIMATION FRAME", 10, screenHeight-60, 10, rl.DarkGray)
+		rl.DrawText("PRESS C to CYCLE THROUGH ANIMATIONS", 10, screenHeight-40, 10, rl.DarkGray)
+		rl.DrawText("PRESS M to toggle MESH, B to toggle SKELETON DRAWING", 10, screenHeight-20, 10, rl.DarkGray)
+		rl.DrawText("(c) CesiumMan model by KhronosGroup", screenWidth-210, screenHeight-20, 10, rl.Gray)
+
+		rl.EndDrawing()
+	}
+
+	// De-Initialization
+	rl.UnloadModelAnimations(anims)
+	rl.UnloadModel(model)
+	rl.CloseWindow()
+}