step 1

src/Cameras/Inputs/babylon.arcRotateCameraPointersInput.ts

@@ -114,7 +114,7 @@ module BABYLON {
                     //but emptying completly pointers collection is required to fix a bug on iPhone : 
                     //when changing orientation while pinching camera, one pointer stay pressed forever if we don't release all pointers  
                     //will be ok to put back pointers.remove(evt.pointerId); when iPhone bug corrected
-                    if (engine.badOS) {
+                    if (engine._badOS) {
                         pointA = pointB = null;
                     }
                     else {

src/Tools/babylon.dds.ts

@@ -479,7 +479,7 @@
                             dataLength = width * height * 4;
                             var floatArray: Nullable<ArrayBufferView> = null;
 
-                            if (engine.badOS || engine.badDesktopOS || (!engine.getCaps().textureHalfFloat && !engine.getCaps().textureFloat)) { // Required because iOS has many issues with float and half float generation
+                            if (engine._badOS || engine._badDesktopOS || (!engine.getCaps().textureHalfFloat && !engine.getCaps().textureFloat)) { // Required because iOS has many issues with float and half float generation
                                 if (bpp === 128) {
                                     floatArray = DDSTools._GetFloatAsUIntRGBAArrayBuffer(width, height, dataOffset, dataLength, arrayBuffer, i);
                                 }