I’m trying to create a city canal, but I’m not quite sure how to start. As far as I can see, I have two options
Creating the city ground from a 3D software (Blender, Maya, etc.)
Use the landscape sculpt tool
I tried using the sculpt tool, but I can’t seem to make the shape as I’d like. I haven’t used the sculpt tool much, and I’m not sure how to really use it to make straight crevices that would work as the canals.
that’s a tough question to answer and there are most probably more than one ‘correct’ ways of doing it. So when I were the one to make this decision I would think about some more aspects. For example, should the canal remain easily changable? This would discard one big static mesh and favor e.g. the use of a spline (never used this myself but I’ve seen a video where a race track is build this way). Also important, what is the style of the canal? Is it a ‘plain’ canal in the typical __/ form, or is it a canal like in Venice? In the latter case you wouldn’t probably need any canal-mesh, but just objects for the buildings, bridges and pavements with one side facing the water. Also a ‘plain’ canal can change over his course (besides his direction), speaking namely of textures, wall height and wall slope. So I would build up the canal of different parts that can be duplicated. The Venice canal like I described above and the ‘plain’ canal of simple plates of concrete that I can simply tile together. But this can be of course tedious when you build a very, very long canal.
I tried to do this with the default sculpt tool and failed, too. But when you set the ‘Sculpt Tool’ to ‘Ramp Tool’, it should be exactly what you need:
Simply drag a line from ramp start to ramp end to create the two ramp points and alter the height of one. Then click on ‘Add Ramp’.