Forums Technical Discussion Edge Groupe by angle

Edge Groupe by angle

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X_H_N
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Exist way to make edge group with green edges and ignore red edges?

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Screenshot 2017-03-07 23.47.41.png (876.9 KB)

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Konstantin Magnus
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Try using a polyframe SOP to change normals (eg. setting ‘tangent’ to ‘N’) before creating an edge group based on normals. In the end reset the normals with a normal SOP.
https://procegen.konstantinmagnus.de/ [procegen.konstantinmagnus.de]
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X_H_N
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I do this with attribute wrangle
code:

int points = neighbours(0,@ptnum);
int num;
float dotp;
vector pos;
vector angle;
foreach(num; points){
pos = point(0,“P”,num);
angle = pos - @P;
dotp = dot(@N,angle);

if(dotp > -0){
@group_ExcludeGroup = 1;
}
}
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Benjamin Lemoine
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Or you can do it with SOP only by measuring curvature withe the measure SOP to get the concave edge then invert the group …it's not 100% sure but no coding…

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group_convex.hipnc (65.4 KB)

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Pavel Geraskin
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I have created another one variant for concave/convex edges. I used VOP and Python nodes. I attached some screenshots and my HIP file.
Edited by Pavel Geraskin - Jan. 19, 2022 12:25:54

Attachments:
tmp_1.hip (499.3 KB)
tmp1.png (127.4 KB)
tmp2.png (19.4 KB)

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