The first thing I started
modeling was the front arc. This was one of the main parts
of the car. On Fig 07. You can see how I made the outline
for the front arc, using curves (99% of the time I use curves,
and not interpolated curves) When I draw these curves I always
make them with the fewest points as possible, when working
with NURBS it's always a good idea to keep things simple,
if you use too many points you will quickly get some bulgy
surfaces, they will look ugly, and you will get a hard time
filleting the edges.
With these 4 curves I could easily make a 2-rail sweep, the
result can be seen on Fig 08. But as you can see the surface
is far from simple and it doesn't fit the blueprints at all.
To make the surface more simple I used the "removeknotsrf"
command and removed all the knotlines that I didn't need to
form the shape. With a lot simpler surface I manually tried
to deform the surface to fit the blueprints better, the final
result can be seen in Fig09. But as you can see it actually
doesn't fit the blueprints, but thats because the lines in
the blueprint isn't the contour line but intersection lines
between the arc and side/hood of the car. So to see if the
arc is correct I used the top view as reference and drew what
you see as a green line in Fig 04. If I trim away the area
inside the greenline, the arc should fit with the blueprint.
on Fig 10. you can see how it looks when it's trimmed.
After I made the front arc I of course made the back arc,
using the exact same tecnique.
You may ask yourself why I didn't make the half of the arc
and then mirrored it to make the whole piece. I could have
done it this way, by having one of the rails going trough
the middle of the car, but it would have been impossible to
get a perfect curvature over the seam.
|
