I noticed this happening on some of my other content but I have not yet been able to determine what is causing it. The grill, hub cap, door and handle details are all missing. As can be seen the (same) Bump map is applied but it does not seem to have any effect. Note the front grill, hub caps, door outline and door handle. I have tried using both a PNG and a BMP for the height map (since some channel, such as Opacity, use the Alpha channel when provided a PNG) but in neither case did the bump map seem to do anything. In Blender the bump map works as expected but when I apply it in iClone it does not seem to have any effect. I have a model which uses a bump map to create some height detail.
