使用 python/API 在 Maya 中查找特定半径内的顶点

Question

I'm trying to find the closest vertex on a mesh but within a radius. This is to avoid having to loop through all the vertices as that's time consuming. Example, I have 2 shirts with different vertex count and I'm trying to find the closest vertex of vertex1 that's on mesh2's right sleeve on mesh1's right sleeve. I don't want to loop through verts beyond the sleeve as logically no vertices will be close enough. I understand that there is an assumption that there could be other vertices closer, but for the usage I'm looking for, I don't foresee that being an issue.

I have the code to loop through vertices and get the closest point, but if the mesh has a high vert count, it takes a long time, even if it's using the API.

Is there a function in maya that lets you limit vertices based of a radius? Or any tips on how I can write a function that could do that?

Answer 1

You can use the node nearestPointOnMesh. In maya API, you can look for MFnMesh::closestIntersection class that can raycast ( Querying of a point is within a mesh maya python api )

vtx = 'shirt1.vtx[0]'
pos = cmds.pointPosition(vtx)
m = 'shirts2'
objShape = cmds.listRelatives(m, ni=True, type='mesh')[0]
node = cmds.createNode('nearestPointOnMesh')
cmds.connectAttr(objShape + ".worldMesh", node + ".inMesh")
cmds.setAttr(node + ".inPosition", type = 'double3', *pos)
target_pos = cmds.getAttr(node + '.position')[0]
face = cmds.getAttr(node + ".nearestFaceIndex")