Nephen

In fact, splitting into several walls leads to better results… Ok let's consider, it s the solution...

it looks now like i scaled object. Not even start sculpt.Same result : awful. I wonder sometimes if retopo will not discourage me from 3D ( Retopo will decimation manage to do something, but of course, this is absolutly not what i want.

I tried, activating or not "Hardsurface" The kind of thing i get…. If i would separate walls, i anticipate some pb in joining in these non regular corner sides. But perhaps it can be managed anyway. One wall for the front, one for each side, read, and then one wall for each interior wall ?

I try to understand 3D workflow, but i have currently a kind of "basic questions" about retopo. I try "autopo" for this mesh, which seems very simple… But i get horrible results. I do not understand why. Is there some "hidden" pb with this kind of mesh ? Should i have created separated objects for some walls ? Where should i draw strokes on this kind of models ? Should i draw then in both "faces" of this building ? "Instant Retopo" gives a better result, but i wonder how to figure i must tweak on not the result : depending on the camera orientation, some poly are correctly covered, then incorrectly covered. Should i fix every quad that must cover high poly whatever camera orientation ? This i not clear "when should i tweak retopo" and how to control quiclky will be correct - baking the Normal map and use it in another room on the low poly ? Sorry for these basic questions, but sometimes it seems difficult to find answers on "basic concept".