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Thanks a lot. It is work perfect!

I dont understand mean the d(C) - what is it?

How I can determine normals direction relative one another?

Great thanks!

Of course yes. B/c I need to draw its with Flash draw API.

How I can draw the blue line?
http://board.flashkit.com/board/attachment.php?attachmentid=71955&stc=1&d=1271278658

Is there a way avoid to calculate angles? I need just normalized normal vector (i e vector that has length 1).

Well. How I can calculate normal vector to line?

I have the line that slope on some angle. How I can draw normal to the end of line?

I have the polyline. How I can to calculate points that will outstand from this line for some distance?

renderhjs, one question.

Why in your formula for calculating matrix for UV:

a.a=(uv[1].-uv[0].x)

Why not
a.a=(uv[1].-uv[0].x)/w ?

Please point me what's wrong.

renderhjs — THANKS A LOT! Its so clear and simple!

@renderhjs thanx for your answer! Im waiting for your explanations! :)

Great thanks for your tutorial. Would you so kind to explian more detailed the matrix operations above? I have isomnia :( trying to understand how its work.