GetNearestPointToLine / Maya

GetNearestPointToLine.py

#pointAとpointBを結ぶ直線とpointPの最近点の座標を返す

import pymel.core as pm
import pymel.core.datatypes as dt
import maya.cmds as cmds

def GetNearestPointToLine(pointA,pointB,pointP):
	AP = pointP - pointA
	nAB = (pointB - pointA).normal()

	dist_AX =  dt.dot( nAB, AP )
	pointRet = dt.Vector(0, 0, 0)
	pointRet.x = pointA.x + ( nAB.x * dist_AX )
	pointRet.y = pointA.y + ( nAB.y * dist_AX )
	pointRet.z = pointA.z + ( nAB.z * dist_AX )

	return pointRet
	
#usage
#select = cmds.ls(sl=True, fl=True)
#pointA = pm.PyNode(select[0]).getTranslation('world')
#pointB = pm.PyNode(select[1]).getTranslation('world')
#pointP = pm.PyNode(select[2]).getTranslation('world')
#NP = GetNearestPointToLine(pointA,pointB,pointP)
#cmds.spaceLocator( p=NP )