DaBjork wrote:

> Any ideas?

Supposing portholes are to be created by differencing spheres
from the walls: Create an array of porthole positions, then use
two loops to two build two unions of spheres (or blobs if suitable,
that would render faster). For each porthole position, add a small 
sphere for the geometry and a larger sphere for the texture effect.
Difference the first set from the walls, and use the object
pattern to make a texture from the second set.

If the object pattern does not look good due to transition,
you might directly create a long texture layering or averaging
spherical patterns.

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