Bump mapping is a technique in computer graphics for simulating bumps and wrinkles on the surface of an object.
This techniques I have used for my Rendered wallpaper in 4K resolution / Ultra high definition resolution for you:
Do not forget: with PTC Creo Parametric Bump maps are now realistically displayed in the graphics areas. More information find here: PTC Creo Parametric 3.0 - Rendering Enhancements.
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Creo Tutorial: How to... ADVANCED RENDERING with PTC Creo Parametric 2.0