https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12879564#M793 <P>I'm using 3ds Max's `meshop.divideEdge` to split an edge, and the split ratio comes from calculating the edge's vector. This vector is determined by the two points A and B obtained via `meshop.getVertsFromEdge`. Therefore, the ratio I calculate matches the direction from A to B. However, since `getVertsFromEdge` returns a BitArray, the vertex IDs are always in ascending order. But the `divideEdge` method seems to use an edge direction that I can't determine to calculate the split position, which results in the `divideEdge` position being different from what I expected.</P><P>&nbsp;</P><P>Therefore, I believe that only by knowing the true direction of the edge can I make the `divideEdge` function work as expected.</P> Fri, 05 Jul 2024 05:27:07 GMT futengda 2024-07-05T05:27:07Z https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12879564#M793 <P>I'm using 3ds Max's `meshop.divideEdge` to split an edge, and the split ratio comes from calculating the edge's vector. This vector is determined by the two points A and B obtained via `meshop.getVertsFromEdge`. Therefore, the ratio I calculate matches the direction from A to B. However, since `getVertsFromEdge` returns a BitArray, the vertex IDs are always in ascending order. But the `divideEdge` method seems to use an edge direction that I can't determine to calculate the split position, which results in the `divideEdge` position being different from what I expected.</P><P>&nbsp;</P><P>Therefore, I believe that only by knowing the true direction of the edge can I make the `divideEdge` function work as expected.</P> Fri, 05 Jul 2024 05:27:07 GMT https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12879564#M793 futengda 2024-07-05T05:27:07Z https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12879698#M794 <P>you need edge vertices in the direction order:</P><LI-CODE lang="general">/* --&gt; get face index by edge index: face = (edge - 1) / 3 + 1 --&gt; get edge index in face: n = (mod (edge - 1) 3) + 1 */ -- get edge verts: fn getMeshEdgeOrderedVerts mesh edge = ( face = (edge - 1) / 3 + 1 n = (mod (edge - 1) 3) + 1 face_verts = getface mesh face edge_verts = case n of ( 1: [face_verts[1], face_verts[2]] 2: [face_verts[2], face_verts[3]] default: [face_verts[3], face_verts[1]] ) ) </LI-CODE> Fri, 05 Jul 2024 06:57:47 GMT https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12879698#M794 denisT.MaxDoctor 2024-07-05T06:57:47Z https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12887935#M795 you are awesome! Wed, 10 Jul 2024 01:29:26 GMT https://forums.autodesk.com/t5/3ds-max-programming-forum/how-to-get-the-direction-of-an-edge/m-p/12887935#M795 futengda 2024-07-10T01:29:26Z