The second shot to talk about today is of Mimas, one of the moons of Saturn. Let’s first take a look at Bonestells depiction of the moon.
This is one of my favourite Bonestell paintings. The lighting on Saturn looks almost translucent, and the shadowing of the rings and moon being cast back onto the surface of Saturn are a sight to see. The biggest challenge in recreating this scene is the sense of scale. When creating landscape renders, we are used to using Atmosphere/Environment shaders. These help create a sense of depth as a viewer, and a graduation of colour as the view vanishes over the horizon. With a small rocky moon, there is no atmosphere, so it is hard to convey this concept. and keep realism in mind.
Looking at the foreground rocks in the image, I decided these would be the best way to help illustrate the scale of the landscape. The problem to solve then is how am I going to have millions of rocks active in a scene?
I used high quality proxy models of rocks for the first third of the image, and swapped them out for extremely low LOD proxies as they were positioned further away from the camera, and decreased in scale. I then instanced the proxies, and placed them into a Matrix Scatter. This allowed me to scatter a huge amount of geometry and not run out of VRAM when it came to rendering.
The base landscape was generated in World Creator, it is a 1km/1km base, which I used to scatter the geometry across. The base landscape was then exported as a TIFF, brought into Cinema 4D and displaced using Redshift. I used a displacer modifier in C4D and matched the elevation. This geometry was then used for the scatter, but swapped out for the displacement map in the final render. Most of the foreground elements were hand placed, so I had a good stage to animate the explorers wandering across the barren moon.
Lastly, to create a greater sense of depth, I created a ground ‘fog’. Although not present in real life, a subtle fog helps emulate the sense of moon dust which could be displaced above the surface of Mimas (especially when being disturbed by intrepid explorers!