C4D凌波微步效果器 GhostWalker Effector

    #  by taorong 2014/12/21
    #  GhostWalker Effector/凌波微步效果器
    # Walker移动时，克隆内的物体自动移动到脚下，附加变色效果
import c4d
from c4d.modules import mograph as mo
from c4d import utils
#Welcome to the world of Python
def main():
    md = mo.GeGetMoData(op)
    if md==None: return False

    cnt = md.GetCount()
    marr = md.GetArray(c4d.MODATA_MATRIX)
    carr = md.GetArray(c4d.MODATA_COLOR)
    warr = md.GetArray(c4d.MODATA_WEIGHT)
    distanceMatrix = md.GetArray(c4d.MODATA_WEIGHT)
    fall = md.GetFalloffs()


    refobj = op[c4d.ID_USERDATA,1]

    boundary = op[c4d.ID_USERDATA,6]
    refobjposition = refobj.GetAbsPos()
    userpos = boundary.GetAbsPos()

    for j in reversed(xrange(0, cnt)):#estimate distance from object to cloner
        differencevector = userpos - marr[j].off
        distanceMatrix[j] = differencevector.GetLength()

    threshold = min(distanceMatrix)

    for i in reversed(xrange(0, cnt)):

        differencevector = refobjposition - marr.off
        distance = differencevector.GetLength()
        if distance<=threshold:
            boxsteppedcolor = 1   
            carr = c4d.Vector(boxsteppedcolor)

            boxsteppedweight = 1
            warr = boxsteppedweight
           # print distance

        else:
            boxsteppedcolor = 0   
            carr = c4d.Vector(boxsteppedcolor)

            boxsteppedweight = 0
            warr = boxsteppedweight
  #          print distance


    md.SetArray(c4d.MODATA_COLOR, carr, True)
    md.SetArray(c4d.MODATA_WEIGHT, warr, True)
    return True

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