@ebara0003 wrote:
...I would like to represent a chair seat with Fusion 360...I got two advices: one to use Surface modeling and one to use Sculpting...
Either approach might be of use. the approach you take will depend on a number of factors, mostly related to the details of the seat. I have made many seats and chairs/stools, and sometimes use straight surfacing, straight "sculpting" (or t-splines using original terminology), and combinations of both.
the picture you posted probably lends itself to using straight surfacing, but using an over built t-spline surface might be of use also. I've attached a quick example of an over built surface technique.
OTOH, some shapes and transitions can be hard to capture with a surfacing approach, such as this stool seat pictured below. this was done with a t-spline body-
this was done with an extrude and a revolve-
and this was done with various surfacing techniques. you can see the results are similar to using the overbuilt t-spline surface approach. This model was done as an example for someone on the forums some years ago. i'll attach it also.
either way there is a bit to learn. one of the pitfalls of using t-splines is the perceived simplicity. There is more to using them than is apparent at first.
I think posting specifics about the final design will probably yield more help and suggestions.