Added mode to render only when needed

src/RenderMode.js

@@ -0,0 +1,5 @@
+export const RenderMode = {
+    Always: 0,
+    OnChange: 1,
+    Never: 2
+};

src/SceneHelper.js

@@ -129,6 +129,10 @@ export class SceneHelper {
         this.meshCursor.visible = visible;
     }
 
+    getMeschCursorVisibility() {
+        return this.meshCursor.visible;
+    }
+
     setMeshCursorPosition(position) {
         this.meshCursor.position.copy(position);
     }

src/SplatMesh.js

@@ -72,6 +72,7 @@ export class SplatMesh extends THREE.Mesh {
         this.maxRadius = 0;
         this.visibleRegionRadius = 0;
         this.visibleRegionFadeStartRadius = 0;
+        this.visibleRegionChanging = false;
 
         this.disposed = false;
     }
@@ -921,6 +922,7 @@ export class SplatMesh extends THREE.Mesh {
         this.material.uniforms.currentTime.value = performance.now();
         this.material.uniforms.fadeInComplete.value = fadeInComplete;
         this.material.uniformsNeedUpdate = true;
+        this.visibleRegionChanging = !fadeInComplete;
     }
 
     /**

src/Viewer.js

@@ -20,13 +20,14 @@ import { VRButton } from './webxr/VRButton.js';
 import { ARButton } from './webxr/ARButton.js';
 import { delayedExecute } from './Util.js';
 import { LoaderStatus } from './loaders/LoaderStatus.js';
-
+import { RenderMode } from './RenderMode.js';
 
 const THREE_CAMERA_FOV = 50;
 const MINIMUM_DISTANCE_TO_NEW_FOCAL_POINT = .75;
 const MIN_SPLAT_COUNT_TO_SHOW_SPLAT_TREE_LOADING_SPINNER = 1500000;
 const FOCUS_MARKER_FADE_IN_SPEED = 10.0;
 const FOCUS_MARKER_FADE_OUT_SPEED = 2.5;
+const CONSECUTIVE_RENDERED_FRAMES_FOR_FPS_CALCULATION = 60;
 
 /**
  * Viewer: Manages the rendering of splat scenes. Manages an instance of SplatMesh as well as a web worker
@@ -121,6 +122,8 @@ export class Viewer {
             this.gpuAcceleratedSort = false;
         }
 
+        this.renderMode = options.renderMode || RenderMode.Always;
+
         this.controls = null;
 
         this.showMeshCursor = false;
@@ -147,6 +150,7 @@ export class Viewer {
 
         this.currentFPS = 0;
         this.lastSortTime = 0;
+        this.consecutiveRenderFrames = 0;
 
         this.previousCameraTarget = new THREE.Vector3();
         this.nextCameraTarget = new THREE.Vector3();
@@ -283,6 +287,10 @@ export class Viewer {
         }
     }
 
+    setRenderMode(renderMode) {
+        this.renderMode = renderMode;
+    }
+
     onKeyDown = function() {
 
         const forward = new THREE.Vector3();
@@ -941,6 +949,7 @@ export class Viewer {
                     this.sortPromiseResolver();
                     this.sortPromise = null;
                     this.sortPromiseResolver = null;
+                    this.forceRenderNextFrame();
                     if (sortCount === 0) {
                         this.runAfterFirstSort.forEach((func) => {
                             func();
@@ -1088,13 +1097,60 @@ export class Viewer {
             this.requestFrameId = requestAnimationFrame(this.selfDrivenUpdateFunc);
         }
         this.update();
-        this.render();
+        if (this.shouldRender()) {
+            this.render();
+            this.consecutiveRenderFrames++;
+        } else {
+            this.consecutiveRenderFrames = 0;
+        }
+        this.renderNextFrame = false;
     }
 
+    forceRenderNextFrame() {
+        this.renderNextFrame = true;
+    }
+
+    shouldRender = function() {
+
+        let renderCount = 0;
+        const lastCameraPosition = new THREE.Vector3();
+        const lastCameraOrientation = new THREE.Quaternion();
+        const changeEpsilon = 0.0001;
+
+        return function() {
+            let shouldRender = false;
+            let cameraChanged = false;
+            if (this.camera) {
+                const cp = this.camera.position;
+                const co = this.camera.quaternion;
+                cameraChanged = Math.abs(cp.x - lastCameraPosition.x) > changeEpsilon ||
+                                Math.abs(cp.y - lastCameraPosition.y) > changeEpsilon ||
+                                Math.abs(cp.z - lastCameraPosition.z) > changeEpsilon ||
+                                Math.abs(co.x - lastCameraOrientation.x) > changeEpsilon ||
+                                Math.abs(co.y - lastCameraOrientation.y) > changeEpsilon ||
+                                Math.abs(co.z - lastCameraOrientation.z) > changeEpsilon ||
+                                Math.abs(co.w - lastCameraOrientation.w) > changeEpsilon;
+            }
+
+            shouldRender = this.renderMode !== RenderMode.Never && (renderCount === 0 || this.splatMesh.visibleRegionChanging ||
+                           cameraChanged || this.renderMode === RenderMode.Always || this.dynamicMode === true || this.renderNextFrame);
+
+            if (this.camera) {
+                lastCameraPosition.copy(this.camera.position);
+                lastCameraOrientation.copy(this.camera.quaternion);
+            }
+
+            renderCount++;
+            return shouldRender;
+        };
+
+    }();
+
     render = function() {
 
         return function() {
             if (!this.initialized || !this.splatRenderingInitialized) return;
+
             const hasRenderables = (threeScene) => {
                 for (let child of threeScene.children) {
                     if (child.visible) return true;
@@ -1141,14 +1197,18 @@ export class Viewer {
         let frameCount = 0;
 
         return function() {
-            const currentTime = getCurrentTime();
-            const calcDelta = currentTime - lastCalcTime;
-            if (calcDelta >= 1.0) {
-                this.currentFPS = frameCount;
-                frameCount = 0;
-                lastCalcTime = currentTime;
+            if (this.consecutiveRenderFrames > CONSECUTIVE_RENDERED_FRAMES_FOR_FPS_CALCULATION) {
+                const currentTime = getCurrentTime();
+                const calcDelta = currentTime - lastCalcTime;
+                if (calcDelta >= 1.0) {
+                    this.currentFPS = frameCount;
+                    frameCount = 0;
+                    lastCalcTime = currentTime;
+                } else {
+                    frameCount++;
+                }
             } else {
-                frameCount++;
+                this.currentFPS = null;
             }
         };
 
@@ -1227,6 +1287,7 @@ export class Viewer {
                 this.sceneHelper.setFocusMarkerOpacity(newFocusMarkerOpacity);
                 this.sceneHelper.updateFocusMarker(this.nextCameraTarget, this.camera, renderDimensions);
                 wasTransitioning = true;
+                this.forceRenderNextFrame();
             } else {
                 let currentFocusMarkerOpacity;
                 if (wasTransitioning) currentFocusMarkerOpacity = 1.0;
@@ -1237,6 +1298,7 @@ export class Viewer {
                     this.sceneHelper.setFocusMarkerOpacity(newFocusMarkerOpacity);
                     if (newFocusMarkerOpacity === 0.0) this.sceneHelper.setFocusMarkerVisibility(false);
                 }
+                if (currentFocusMarkerOpacity > 0.0) this.forceRenderNextFrame();
                 wasTransitioning = false;
             }
         };
@@ -1250,6 +1312,7 @@ export class Viewer {
 
         return function() {
             if (this.showMeshCursor) {
+                this.forceRenderNextFrame();
                 this.getRenderDimensions(renderDimensions);
                 outHits.length = 0;
                 this.raycaster.setFromCameraAndScreenPosition(this.camera, this.mousePosition, renderDimensions);
@@ -1261,6 +1324,7 @@ export class Viewer {
                     this.sceneHelper.setMeshCursorVisibility(false);
                 }
             } else {
+                if (this.sceneHelper.getMeschCursorVisibility()) this.forceRenderNextFrame();
                 this.sceneHelper.setMeshCursorVisibility(false);
             }
         };
@@ -1279,7 +1343,7 @@ export class Viewer {
             const meshCursorPosition = this.showMeshCursor ? this.sceneHelper.meshCursor.position : null;
             const splatRenderCountPct = this.splatRenderCount / splatCount * 100;
             this.infoPanel.update(renderDimensions, this.camera.position, cameraLookAtPosition,
-                                  this.camera.up, meshCursorPosition, this.currentFPS, splatCount,
+                                  this.camera.up, meshCursorPosition, this.currentFPS || 'N/A', splatCount,
                                   this.splatRenderCount, splatRenderCountPct, this.lastSortTime);
         };
 

src/index.js

@@ -13,6 +13,7 @@ import { OrbitControls } from './OrbitControls.js';
 import { AbortablePromise } from './AbortablePromise.js';
 import { SceneFormat } from './loaders/SceneFormat.js';
 import { WebXRMode } from './webxr/WebXRMode.js';
+import { RenderMode } from './RenderMode.js';
 
 export {
     PlyParser,
@@ -29,5 +30,6 @@ export {
     OrbitControls,
     AbortablePromise,
     SceneFormat,
-    WebXRMode
+    WebXRMode,
+    RenderMode
 };