I have a 3d model that I want to add a butt to. (I am not doing this for NSFW purposes). I have tried various techniques including the inflate tool and proportional editing, but the model appears blocky and out of shape. (subdivision doesn't fix this). What's the best way I can edit a model to add a butt.
the best way is sculpting at a low resolution with dyntopo or with multiresolution instead if you dont care pretty much of making a retopo after doing a dyntopo sculpt , because dyntopo is triangle based topology, but multiresoltion is quad based topology. thats my two cents...if you need more info tell me...
Make sure the area in question is an extrusion such as a finger, arm or leg. Increase your vertex density wisely if that meets your goals. Extrusion allows some isolation of your vertex density. A cube can be considered an extrusion of a flat plane. With more vertex density the cube can be shaped into sphere with standard Blender tools in a few seconds. If you are willing to add more vertices anything can be rounded.