如何在maya中计算面上某个点的关节权重值。假设我们有一个平面,我们要计算它的插值权重,在面上的任意点上。我知道maya中的“复制蒙皮权重工具”(copy skin weights tool)在插值方面做得很好,但不确定其背后的数学原理。在
import maya.cmds as cmds
if __name__ == '__main__':
# Build two planes. One with no subdivs and one with 2.
plane = cmds.polyPlane(name="plane_GEO",
subdivisionsX=1,
subdivisionsY=1,
width=10.0,
height=10.0)
planeRef = cmds.polyPlane(name="plane_cn_GEO",
subdivisionsX=2,
subdivisionsY=2,
width=10.0,
height=10.0)
#Move vertices.
cmds.move(2, 0, 0, "%s.vtx[1]" % planeRef[0], relative=True)
cmds.move(2, 0, 0, "%s.vtx[4]" % planeRef[0], relative=True)
cmds.move(2, 0, 0, "%s.vtx[7]" % planeRef[0], relative=True)
cmds.move(0, 0, 2, "%s.vtx[3:5]" % planeRef[0], relative=True)
#Make joints.
cmds.select(clear=True)
jntA = cmds.joint(name="a_JNT", p=[5, 0, -5])
cmds.select(clear=True)
jntB = cmds.joint(name="b_JNT", p=[5, 0, 5])
cmds.select(clear=True)
jntC = cmds.joint(name="c_JNT", p=[-5, 0, 5])
cmds.select(clear=True)
jntD = cmds.joint(name="d_JNT", p=[-5, 0, -5])
cmds.select(clear=True)
#Bind joints.
skinA = cmds.skinCluster([jntA, jntB, jntC, jntD],
plane[0],
name='%s_SKNCLUST' % plane[0],
toSelectedBones=True,
skinMethod=1,
normalizeWeights=1)
skinB = cmds.skinCluster([jntA, jntB, jntC, jntD],
planeRef[0],
name='%s_SKNCLUST' % planeRef[0],
toSelectedBones=True,
skinMethod=1,
normalizeWeights=1)
#Copy skin weight for reference of what joint weight is supposed to be.
cmds.copySkinWeights(sourceSkin=skinA[0],
destinationSkin=skinB[0],
noMirror=True,
surfaceAssociation="closestPoint",
influenceAssociation="name")
#Hide it.
cmds.setAttr(planeRef[0] + ".visibility", 0)
#Make a locator at a position.
loc = cmds.spaceLocator(name="anno_LOC")
cmds.move(2, 0, 2, loc[0])
#Make an annotation.
ano = cmds.annotate(loc[0],
tx="What is the joint weight values at this point?",
p=[2, 5, 2])
anoTrans = cmds.listRelatives(ano, parent=True)
cmds.rename(anoTrans, "weight_ANNOTATE")
这是一个简单的场景来展示我在玛雅的意思。希望它能理清思路。在
谢谢你的帮助。在
谢谢你joojaa!在
从这里得到函数: https://gamedev.stackexchange.com/questions/23743/whats-the-most-efficient-way-to-find-barycentric-coordinates
转换后的python函数:
插值的计算方式与maya中的copySkinWeights命令完全相同。在
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