If you want to achieve more realistic image, you can follow the step from the last video in the series and export the scene as an FBX. However, if you prefer to stay within ZBrush and setup the render with BPR, you can also do that. I’d recommend you render out two very useful render passes to help you in the compositing: A normal matcap render and the Depth mask that get rendered automatically. These are the simple BPR passes I usually get from ZBrush BPR:
The normal matcap pass is awesome because just like the Normal map in texturing, it uses RGB channels to identify the direction of the volume normals. In practical terms, you can use the normal pass to select a specific hue range from the image and create a mask to change the colour or simply ‘re-light’ the render:
The colour that you pick will ultimately create a nice mask based on the direction of the volume that matches the specific colour hue and you can make that into a mask to edit that specific part:
The Depth pass is another very handy tool that allows you to create a few different effects. One of my favourite things to do when working with these type of ‘hazy’ atmospheric concepts, is to use the Depth pass as a mask and easily add fog or mist to the scene to enhance the sense of depth in the image.
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