Add perspective toggles

TODO.md

@@ -46,7 +46,7 @@ A step-by-step checklist for porting MatterControl's design features to a Vue +
 - [x] Add "fit to selection" camera function
 - [x] Add "reset view" function (home position)
 - [x] Add view presets (front, back, top, bottom, left, right)
-- [ ] Add orthographic/perspective toggle
+- [x] Add orthographic/perspective toggle
 
 ### Scene State Management
 - [ ] Create `useScene` composable for scene state

src/components/Viewport.vue

@@ -17,7 +17,10 @@ const props = withDefaults(
 const containerRef = ref<HTMLDivElement | null>(null)
 
 let scene: THREE.Scene
-let camera: THREE.PerspectiveCamera
+let perspectiveCamera: THREE.PerspectiveCamera
+let orthographicCamera: THREE.OrthographicCamera
+let activeCamera: THREE.PerspectiveCamera | THREE.OrthographicCamera
+let isOrthographic = false
 let renderer: THREE.WebGLRenderer
 let animationFrameId: number
 let resizeObserver: ResizeObserver
@@ -47,11 +50,27 @@ function initScene() {
   scene = new THREE.Scene()
   scene.background = new THREE.Color(0x1a1a2e)
 
-  // Create camera
+  // Create cameras
   const { clientWidth: width, clientHeight: height } = containerRef.value
-  camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 1000)
-  camera.position.copy(HOME_POSITION)
-  camera.lookAt(HOME_TARGET)
+  const aspect = width / height
+
+  perspectiveCamera = new THREE.PerspectiveCamera(45, aspect, 0.1, 1000)
+  perspectiveCamera.position.copy(HOME_POSITION)
+  perspectiveCamera.lookAt(HOME_TARGET)
+
+  const frustumSize = 10
+  orthographicCamera = new THREE.OrthographicCamera(
+    (-frustumSize * aspect) / 2,
+    (frustumSize * aspect) / 2,
+    frustumSize / 2,
+    -frustumSize / 2,
+    0.1,
+    1000
+  )
+  orthographicCamera.position.copy(HOME_POSITION)
+  orthographicCamera.lookAt(HOME_TARGET)
+
+  activeCamera = perspectiveCamera
 
   // Create renderer
   renderer = new THREE.WebGLRenderer({ antialias: true })
@@ -60,7 +79,7 @@ function initScene() {
   containerRef.value.appendChild(renderer.domElement)
 
   // Setup orbit controls
-  controls = new OrbitControls(camera, renderer.domElement)
+  controls = new OrbitControls(activeCamera, renderer.domElement)
   controls.enableDamping = true
   controls.dampingFactor = 0.05
 
@@ -139,8 +158,18 @@ function setupResizeObserver() {
     for (const entry of entries) {
       const { width, height } = entry.contentRect
       if (width > 0 && height > 0) {
-        camera.aspect = width / height
-        camera.updateProjectionMatrix()
+        const aspect = width / height
+
+        perspectiveCamera.aspect = aspect
+        perspectiveCamera.updateProjectionMatrix()
+
+        const frustumSize = 10
+        orthographicCamera.left = (-frustumSize * aspect) / 2
+        orthographicCamera.right = (frustumSize * aspect) / 2
+        orthographicCamera.top = frustumSize / 2
+        orthographicCamera.bottom = -frustumSize / 2
+        orthographicCamera.updateProjectionMatrix()
+
         renderer.setSize(width, height)
       }
     }
@@ -152,7 +181,7 @@ function setupResizeObserver() {
 function animate() {
   animationFrameId = requestAnimationFrame(animate)
   controls.update()
-  renderer.render(scene, camera)
+  renderer.render(scene, activeCamera)
 }
 
 function fitToSelection(objects: THREE.Object3D[]) {
@@ -166,31 +195,54 @@ function fitToSelection(objects: THREE.Object3D[]) {
   const center = box.getCenter(new THREE.Vector3())
   const size = box.getSize(new THREE.Vector3())
   const maxDim = Math.max(size.x, size.y, size.z)
-  const fov = camera.fov * (Math.PI / 180)
-  const distance = maxDim / (2 * Math.tan(fov / 2)) * 1.5
 
-  const direction = camera.position.clone().sub(controls.target).normalize()
-  camera.position.copy(center).add(direction.multiplyScalar(distance))
+  const fov = perspectiveCamera.fov * (Math.PI / 180)
+  const distance = (maxDim / (2 * Math.tan(fov / 2))) * 1.5
+
+  const direction = activeCamera.position.clone().sub(controls.target).normalize()
+  activeCamera.position.copy(center).add(direction.multiplyScalar(distance))
   controls.target.copy(center)
   controls.update()
 }
 
 function resetView() {
-  camera.position.copy(HOME_POSITION)
+  activeCamera.position.copy(HOME_POSITION)
   controls.target.copy(HOME_TARGET)
   controls.update()
 }
 
 function setViewPreset(preset: ViewPreset) {
   const position = VIEW_POSITIONS[preset]
-  camera.position.copy(position)
+  activeCamera.position.copy(position)
   controls.target.set(0, 0, 0)
-  camera.up.set(0, 1, 0)
-  if (preset === 'top') camera.up.set(0, 0, -1)
-  if (preset === 'bottom') camera.up.set(0, 0, 1)
+  activeCamera.up.set(0, 1, 0)
+  if (preset === 'top') activeCamera.up.set(0, 0, -1)
+  if (preset === 'bottom') activeCamera.up.set(0, 0, 1)
   controls.update()
 }
 
+function setOrthographic(ortho: boolean) {
+  if (isOrthographic === ortho) return
+
+  const newCamera = ortho ? orthographicCamera : perspectiveCamera
+
+  // Copy position and rotation from current camera
+  newCamera.position.copy(activeCamera.position)
+  newCamera.up.copy(activeCamera.up)
+  newCamera.lookAt(controls.target)
+
+  activeCamera = newCamera
+  isOrthographic = ortho
+
+  // Update controls to use new camera
+  controls.object = activeCamera
+  controls.update()
+}
+
+function toggleProjection() {
+  setOrthographic(!isOrthographic)
+}
+
 function cleanup() {
   if (animationFrameId) {
     cancelAnimationFrame(animationFrameId)
@@ -222,6 +274,8 @@ defineExpose({
   fitToSelection,
   resetView,
   setViewPreset,
+  setOrthographic,
+  toggleProjection,
 })
 </script>