I’ve been waiting for Seb to reply to this thread because I was intrigued by the gothic walls too. After playing around and using the hints he gave, i was able to get a similar effect. Basically:
Create the raised elements (the gothic arch, knots, etc.) as different tools. I created several by taking a plane, making it a pm3d, dividing to a high poly count, storing a morph target, sculpting the shape, and creating a tool from the difference. I also used some heads I’ve sculpted.
Then, taking another pm3d plane divided to about 4m polys, I went into projection master (deform only) and positioned the tools either by resizing the brush and placing a bunch of copies using drag-dot, or just by plain old drag rect and placing them manually.
The results aren’t anything I’d post here. I was just trying to see if I could acheive the same level of detail. But, I think I was able to get an understanding of what Seb did.
Thanks Seb. I love your work. If/when you do get back to the thread, please let us know the details of the alternate workflow you developed.