Used mainly in post-visualization, 3D photo montage or composite images are utilized in special cases where the existing environment is critical to visually communicating design cohesion. This technique is commonplace in Hollywood films blending real-world and virtual objects or blending virtual environments with real-world objects. Time is saved by not extensively recreating a purely 100% virtual (CG) environment. By using compositing, existing site features would not have to modeled or digitized. Details such as sun positioning and site environmental reflections can all be reproduced virtually. Many clients request their final renderings to be remixed into real-world photographs making their proposals extra convincing.