Merge pull request #1217 from nockawa/master

Two small bug fixes

src/Canvas2d/babylon.group2d.ts

@@ -672,13 +672,14 @@
             else {
                 context.partDataStartIndex = 0;
 
-                // Find the first valid object to get the count
-                let i = 0;
-                while (!context.groupInfoPartData[i]) {
-                    i++;
+                if (context.groupInfoPartData.length > 0) {
+                    // Find the first valid object to get the count
+                    let i = 0;
+                    while (!context.groupInfoPartData[i]) {
+                        i++;
+                    }
+                    context.partDataEndIndex = context.groupInfoPartData[i]._partData.usedElementCount;
                 }
-
-                context.partDataEndIndex = context.groupInfoPartData[i]._partData.usedElementCount;
             }
 
             return renderCount;

src/Tools/babylon.dynamicFloatArray.ts

@@ -259,7 +259,10 @@
                 let newCount = Math.min(this.totalElementCount, count * 2);
 
                 this._sortTable = new Array<SortInfo>(newCount);
-                this._sortedTable = new Array<SortInfo>(newCount);
+            }
+
+            if (!this._sortTable || this._sortTable.length !== count) {
+                this._sortedTable = new Array<SortInfo>(count);
             }
 
             // Because, you know...