Post-production might well be the most underappreciated part of creating 3D visualizations. It gives you the power to easily make some changes; put in the sky you like, add some dirt, make the colors more vibrant and even correct some little mistakes in your 3D mesh.
Most of the traditional 3D artists tried to do as much as possible wihtin their 3D package since these packages were not focusing on post, but rather on the 3D products themselves. Rendering masks for the different color corrections one would like to do was a painstaking job of fixing the lighting and materializing — making artists choose to do most of the work in 3D (such as adding dirt and textures) and so leaving only color correction for post-work. The techniques and styles of correcting images in post-production have changed a lot over the last couple of years.
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