optimizations

Author: austinEng

Source/Scene/Cesium3DTilesetTraversal.js

@@ -304,7 +304,7 @@ define([
     };
 
     BaseTraversal.prototype.getChildren = function(tile) {
-        if (this.updateAndCheckChildren(tile)) {
+        if (baseUpdateAndCheckChildren(this.tileset, tile, this.baseScreenSpaceError, this.frameState)) {
             var children = tile.children;
             var childrenLength = children.length;
             var allReady = true;
@@ -331,14 +331,12 @@ define([
         return emptyArray;
     };
 
-    BaseTraversal.prototype.updateAndCheckChildren = function(tile) {
-        var tileset = this.tileset;
-
+    function baseUpdateAndCheckChildren(tileset, tile, baseScreenSpaceError, frameState) {
         if (tile.hasTilesetContent) {
             // load any tilesets of tilesets now because at this point we still have not achieved a base level of content
-            loadTile(tile, this.frameState);
+            loadTile(tile, frameState);
             if (tile.contentReady) {
-                updateChildren(tileset, tile, this.frameState);
+                updateChildren(tileset, tile, frameState);
             }
             return true;
         }
@@ -348,13 +346,13 @@ define([
         }
 
         // stop traversal when we've attained the desired level of error
-        if (tile._screenSpaceError <= this.baseScreenSpaceError) {
+        if (tile._screenSpaceError <= baseScreenSpaceError) {
             // When skipping LODs, require an existing base level of content first
-            updateChildren(tileset, tile, this.frameState);
+            updateChildren(tileset, tile, frameState);
             return false;
         }
 
-        var childrenVisibility = updateChildren(tileset, tile, this.frameState);
+        var childrenVisibility = updateChildren(tileset, tile, frameState);
         var showAdditive = tile.refine === Cesium3DTileRefine.ADD;
         var showReplacement = tile.refine === Cesium3DTileRefine.REPLACE && (childrenVisibility & Cesium3DTileChildrenVisibility.VISIBLE_IN_REQUEST_VOLUME) !== 0;
 
@@ -407,7 +405,7 @@ define([
     };
 
     InternalBaseTraversal.prototype.getChildren = function(tile) {
-        if (this.updateAndCheckChildren(tile, this.baseScreenSpaceError)) {
+        if (baseUpdateAndCheckChildren(this.tileset, tile, this.baseScreenSpaceError, this.frameState)) {
             var children = tile.children;
             var childrenLength = children.length;
             for (var i = 0; i < childrenLength; ++i) {
@@ -580,6 +578,10 @@ define([
     };
 
     function updateChildren(tileset, tile, frameState) {
+        if (tile._lastVisitedFrame === frameState.frameNumber) {
+            return tile.childrenVisibility;
+        }
+
         var children = tile.children;
 
         updateTransforms(children, tile.computedTransform);