Modeling a basic car body
First things first, this tutorial requires the basic knowledge of rhino and if you know more than that, well, thats good for you. ;)
When I start I always start with my template set to milimeters.
My grid snap spacing set to 0.25.
My tolerances set to (from top to down) 0.001, 0.001, 0.01.
And finally the custom render settings of (again, top to down) 20, 6, 0.025, 2, 0, 0.
Now, on to the modeling!
Setup two circles, which should be the wheels and ofcourse maintain the distance between em (wheelbase). Ok, now in the side view, draw a curve for the lower shape of the car. Now on a sidenote, since im making an exotic type of car, the lower part of the car is close to the ground but if youre making a normal type of car simply put that line higher.
Make sure you got your curves setup like mine. If you wonder how I got my curves to touch each other, well, most of the time I got osnap "near" and "end" on.
Draw a profile curve from the top curve to the bottom curve somewhat like mine and sweep2rail it.
Draw another front curve starting at the end of the lower part of the profile curve and sweep2rail that too.
Now select the front curve and split it with the 2nd top curve.
Draw 2 profile curves on both top curves and sweep2 rail em.
Now, I joined the 3 made surfaces but since my fillet from the front to side surface failed we're going to have to find a way to make it nice and smooth anyway, if it works for you you can skip this part. Explode the surface. Since we still got the profile curve, select the profile curve and rebuild it, make sure it has about 15 points, turn the points on (f10) select the lower point and drag it to make the curve longer, do this also on with the top poiint but make sure its still the shape of the original curve, just slightly longer on both sides.
Now that we have done that, select the pipe tool and for thickness on both sides select 1 (which originally would be the size of my fillet) select the front and side surface and split the pipe surface out of it, select the splitted out surfaceand delete it, now blend the edge curves, NOT blendsrf but just blend, do this on the lower part and top part.
When you got the 2 curves, select the top surface and split the upper curve out of it, now select sweep2rail, select both edge curves and use the blend curves as profile curves, in the box select tangency for a and b so the made surface flows nicely without any seems.
Now join all 4 surfaces, mirror them so you've got both sides and it should look something like this.
Select dup edge cope the edges shown in the image and join em since we need to use this as a profile curve.