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Creating ergonomic/organic surfaces
With my current project, I have hit an obstacle. I'd like to better be able to create organically shaped surfaces with OnShape's surface tools. However, often it happens to me that I am just unable to arrive at the shape that I intend. Within the scope of this question, I'd like to examplify this with a seat that I am trying to re-model from a product that is already existing. I also hope to learn about how to use the surface tools better or smarter, so please feel free to elaborate in length if you like.
So let's get to it:
The seat that I am trying to model should look somewhat like this:
I have started modelling this seat by using splines and projected curves.
First a spline for the section view:
Plus an additional closed cuve (grey shaded enclosed area). If I use the "Projected Curve" tool, the result will be the orange curve, which I can then use the "Fill" tool on to create a surface.
This is point at which it becomes difficult - I'd like to add the support wings at the sides of the seat.
If you look back up at first 2 images (the ones of the already existing seat), you can see some wings at the sides of the seat that support the back from the sides, so that sliding off the seat is prevented (circled in red on the 2nd image). I have tried multiple approaches, but it is really hard to incorporate such shapes in the model.
I have tried adding more curves and the projected curve tool again, but unifying the resulting surfaces with the already existing curve of the seat is really difficult. For example, it seems to me it would be useful to be able to place verticies along a curve so that I can use the bridging curve tool better. However, there is no such function. Also, I cannot add verticies by making a plane that intersects with the orange seat curve and use the "intersect" or "use" tool. Apparently they don't work with curves/splines.
Another approach I tried was shaping the section view spline (image number 3 from the top) such that the wings are already included. Then I tried using the "guides" function to create the shape, but the results were less than satisfactory.
I'm taking into account that I am simply not yet well versed enough with the surface relevant tools. I have read up on how to use the tools in the help section, and I have watched the webinar about surface creation by Cody, but it seems this doesn't help me with my problem. If there are technicalities about the surfacing tools that I haven't figured out yet, please educate me a bit about the details or point me in the right direction. If it's not so much a question about the tools and functions, but rather about the approach, please let me know how you would recommed doing it.
Looking forward for your help, thanks in advance!