- Based off of the method that I have described,
as far as building primary surfaces, and some
secondary surfaces, that are overbuilt. You are going
to have to trim things back. And for that, we have a tool
called 'Trim Sheet'. Select the body you want to trim,
you can pick multiple bodies, and then select the object
you want to trim with.
In this case, I am going to
pick the edge off of this blend. This could be a curve
as well, it doesn't matter. Now notice, as soon as I
select that edge I get this little red line. This red
line is indicating that it is doing an extend to the
boundary of that surface face. If I don't have this
toggled on, its going to come back and give you a little
message saying, "Hey, I can't do the trim, 'cause this
does not complete chop off the face." So, we'll just
turn on the extend.
If I show a result, you can see that
it does the trim for me. Let me undo that result.
Now, I can also pick, in this case, this plain. Notice,
that it creates this little criss-cross,
and when I do my 'show result', it's picking this one side.
I am going to undo the result. If I come down to region,
I can determine the side that I want to keep. So,
if I pick this side, you'll notice it's keeping
this entire region, this
side and that side. Well if I only want to keep this side,
I have to hold the shift key down, and deselect the side
that I want to get rid of. So, here you have the side
you want to keep. I also have an option for what's called
'I'll put exact geometry'. Now notice it gives me this
little message, and the reason why it is giving me this
little message is currently I have this edge picked
and this edged picked is a tolerant edge, meaning
it has a tolerance to it.
The way that the system is projecting that edge
down to the surface is not allowing
exact geometry. So this is just a little warning
you want to basically try to minimize the amount of the
tolerant edges that you are using. And in this case
it may be better to instead of just simply leaving
the projection direction normal-to-face, changing this
to an along-the-vector. In this case, it is not going
to change the shape, because this is already sitting
on the face. So I'll pick this vector. Now, you'll notice
that as soon as I select the vector, that the output-exact-
geometry message didn't pop up. Because now it knows it
is projecting it directly in the vector, and it is no
longer using that tolerant projection along the face normal.
The same would be true if I used a curve, so if I have
this curve out in space, select that, it is projecting
that down, onto the surface. Notice that it the region it
is going to keep. And that projection is based off of
that vector.
So if this were to be a face normal, it'll come back
again, you can see the projection change. And then also
give me that warning, "I can't output that exact
geometry". So you can either just turn that off, and leave
everything as is, or turn it on, and use that vector
projection.