Hello guys,
Times ago I asked about a way to detect the corner, and some guys said that I have to measure the angle between the lines, (I made to vectors, one for each line, and then I taked the angle), but in this way the result was not good, does anyone know another way to detect the corner ?
Tnks
Best regards
Kurt
???
am I trying to do something that is impossible ???
Any help or tip will be apreciated.
Tnks
RGDS
Kurt
hmm what corner/edge do you want to detect???
If you are trying to detect a corner in your rendered buffer than it is getting pretty dirty, complicated and hmmm difficult.
Yeah, what do you want to do???
Let’s imagine that I have a cloud of points that describe my model, this model is structured in slices that are segment of lines, (polylines), now I want to know were are the corners in this polyline, you know, I have something like a curve, and in some place I have corners, and I want to detect these corners. Hope, I’m clear enough.
Thank you
Best regards
Kurt
My corners is something like edges , sharp edges.
Tnks
RGDS
Kurt
hmm lets see if i got it.
You have your vertices and the lines which are connecting the vertices, and now you want to know which lines are in a plane and which lines are a corner of an object
[This message has been edited by DaViper (edited 04-11-2001).]
What’s exactly the problem about it?
[This message has been edited by Michael Steinberg (edited 04-11-2001).]
Yes , it is something like, do you want some picture ???
Tnks
RGDS
Kurt
just calcualte the normals of the 2 Polygon adjactet to each line. If the normals point in different directions you have a corner
DaViper,
Do you want some picture ???
RGDS
Kurt
I wanna have a picture
Look in your email.
Now you have any three following points.
v1 = p2-p1;
v2 = p2-p3; // This is a simple flip because I want the angle to be near 0 degrees not near 180 degrees
cos(alpha) = (v1v2)/(|v1||v2|)
alpha_degree = arcuscos(alpha);
if ( alpha_degree > max_degree ) {
// we’ve got a corner here
}
Well just wrote that down so I don’t know if it’s correct. Simply say that max_degree is 10 or so and you’ll find the corners.
[This message has been edited by Michael Steinberg (edited 04-11-2001).]
[This message has been edited by Michael Steinberg (edited 04-11-2001).]
Ok… I will try…
Tnks
RGDS
Kurt
Corrected my posting somewhat.
Ok Michael,
So now, I want to create a new curve using the points that are the edges, in the method that you showed me, we have two vectors, how will I know witch of this is the point, that is the edge ?
Have you undertood my question ?
Tnks
RGDS
Kurt
Hello,
I think I found the answer for my last question, P2 will be the point that the corner is, right ??
Tnks
RGDS
Kurt