In this step we will be creating seat surface. We will create a set of curves, rather, use existing ones and edit them the way we want, and extrude that by the width of the stool. Then with some trimming we will delete excess parts.
Hiding the layer we will see our initial curves left in viewport. We need that rail curve we used earlier. Since it is always a great idea to keep all the curves you used to create surfaces with, we will copy this rail curve. You can do it with Copy command and then clicking InPlace option in command line, or using simply CTRL+C and CTRL+V. Now, using Explode command we will separate that closed curve into its little parts. So, go ahead and do that:
Clicking on various parts you will notice those curves aren’t attached to each other anymore. That is what Join does. Now, we will create one line using a little help from our beloved Osnap. We need Near and Perp options. Near can snap to anywhere on the lines, and perp will snap perpendicular to the line.
Now, the next part might be a little tricky. If you zoom in on the top left radius you will see there is a tiny little line:
We will need to extend that line. And extend its upper end. We will do that with Extend command, and it will work like this. First it will ask you for boundary objects, that part we don’t need. It basically extends the curve up to other boundary object. But we will skip that part with just hitting the Enter key, then it will ask you to select the curve (or in our case line) you wish to extend. Now, note that if you click on the upper half of the line it will extend it from the upper end, and if you click on the lower half of the line it will extend its lower end. So, when you are clicking just make sure you click close enough to the upper end of the line, and extend it like on the image below:
Now, using Trim command we need to trim the lower line with the cross line we created earlier:
Ok, now we only need curves and lines like on the image below: (you can delete all other lines and curves)
Now, using ExtrudeCrv command we need to extrude the red set of curves “along” the black line. Just select the red curves, run ExtrudeCrv command and using OSnap End option you will easily snap to the other end of the line making sure your extrusion is the same value as the line distance:
If you turn on the visibility of the Seat Frame layer, you will see how our seat surface is going through the frame surface:
We don’t want that, so we will Split the red surface with the frame surface and delete the outer part of the seat surface.
There is our seat surface, but it is flat surface. We need it to have some width. So, using OffsetSrf command we will make a solid out of this flat surface. Just note that you need to click on the Solid option in the command line OffsetSrf options. Offset it by 0.1 upwards. If the white arrows say downwards then just click on the surface and the arrows will change its direction.
And our surface now has a thickness. Great. Now we have our seat frame and the seat itself. Next we move on to the stool leg.