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 The first step is to find some references to build the basic environment if you don’t have a concept. Looking over the net I found images of the catacombs and keep looking I discovered that image. I liked the columns there, so that is my reference. The basic structure is almost the same.
I wanted to do something similar but a bit more interesting lighting. The first step was to modeling the 3D base having in mind the type of lighting, the thematic on the lighting if you will.
I’m quite use to model and light environments without previous sketches, so I knew I will use a frontal light, that’s why I had and small entrance on the bottom left.
This is the light set up, Mental Ray to have some bouncing, but keeping it simple, to give the sensation of one point of light.
First idea was to use ZBrush for the whole environment, so I model the column and a wall. But I changed my mind and only used the columns.
 I model the floor with geometry because I wanted to use ZBrush for the floor, but finally I didn’t use it.
I dice to use just one texture for the whole image, using a Box Mapping, just to have some colours for the light and a basic texture to start painting.
When the basic render is done, I thought I had enough with image so I haven’t used Ambient Occlusion or Volumetric Light that very useful, I rather build those elements by painting as an exercise.
The image was smaller, scale up the image to give it more details.
This is the final geometry, I added Ambient Occlusion for the Wires to showing it with volume, but I haven`t use the AO because would darker it too much.
This is the image to start paint over:
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