A digital asset that I created for the NDP project. The purpose of this asset was to create a "city" designed by the NDP team and the original request was the internal surface. To ensure that no 2 extrusions would penetrate each other, two group nodes were used to select every alternate face both vertically and horizontally. This produced the desired result, but it was too regular. In order to randomise the placement of the "buildings", a random function was used to create a selection of polygons for extrusion.
The team later requested for the outer surace to have "buildings" as well, so a reverse node was used to flip the normals before extruding. The 2 surfaces were then merged together.
In the render below, I added a curved top to the hemisphere as the team did not want it to be a flat surface. The curved top was done by extruding the top upwards and using a mountain SOP on those points.
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