Issue with extrude tool

cat

<img src="http://img713.imageshack.us/img713/5917/extr.jpg" border="0" class="linked-image" />
1. What is the best way to grab the two blue lines and extrude them vertically towards the green?
2. Is it possible to extrude multiple lines?
3. How to control in what direction it extrudes?
4. If that is not possible, how to draw rectangles or lines in perspective view along the axis I want?

pSyk0mAn

1. I'd say duplicate the long blue line and move it down there, then draw the 2 vertical lines and that small, diagonal line to the vertex that is already down there.

Edit: Instead of duplicating lines you can also try to draw the 2 vertical lines from up to down first.
If you stay on the axis (proper view angle needed), you can draw it all the way down and the editor should propose the end spot on the height of that one vertex down there.

2. No. But if the best way, you can connect the lines you want to extrude with more lines to create a face and extrude the face.
3. You can't unless you try the create face work around.
4. Line tool and partly retangle tool snap and stay to one of the colored axis as long as you stay close to it and have an optimal view angle.
You can also hold shift with the line tool, when on the correct axis, to force staying on it.

cat

How to use "create face"? I marked two opposing lines and hoped it would bridge them (like in modeling applications), but nothing happened.

pSyk0mAn

You have to select all lines to create the face (they all need to use the same vertices).
dbl-clicking a line selects all the lines needed for a face, but not always the one you are aiming for.

E: You also have to be in select mode afaik.

E2: Join #nsmapping on gamesurge if you like.

cat

So this means I can not bridge edges as in have two opposing, unconnected edges connect by creating a poly over it? If that is so, I basically have to "frame" the polygon completely and then "fill" it with the create face?

I hope they extend the functionality of the editor in that regard.

UncleRay

The only problem I see with spark editor is that it does not extrude both lines on a single plane. I guess this would be to reduce the amount of lines being extruded at once that are connected. You would seemingly have to extrude both lines at different times, and then connect them to the vertices down below.