使用Python在Maya中旋转父对象后计算父控制器的新位置

# # This function creates an animation curve within the scene that follows the path of motion # of the selected controller. It requires keyframe information in order to genereate the curve # and uses the range of frames given by the user. # def createAnimCurve( bodyField, startField, endField, firstColor ): # Takes the value of the text field to select the controller obj = cmds.textField(bodyField, query=True, text=True) print obj # Takes in the string input of the paramter values and turns them into integer values startFrame = cmds.intField(startField, query=True, value=True) print startFrame endFrame = cmds.intField(endField, query=True, value=True) print endFrame color = cmds.colorIndexSliderGrp( firstColor, query=True, value=True ) - 1 print color if obj == "": cmds.warning( "WARNING: Need to Select Body Part from Diagram" ) return if cmds.objExists(obj[:-3]+'Path'): # Creates a warning pop up that double checks if the user wants to remove the curve delRes = cmds.confirmDialog( title='Delete Path Warning', message='Recreation will delete current path. Are you sure?', button=['Yes','No'], defaultButton='Yes', cancelButton='No', dismissString='No' ) # If yes then the curve is deleted if delRes == 'Yes': #cmds.delete(obj[:-3]+'ScalePath') #cmds.delete(obj[:-3]+'ScalePath_LOC') cmds.delete(obj[:-3]+'Path') cmds.delete(obj[:-3]+'Path_LOC') else: return # Sorts through the list of keyframes of the selected obj from the selected time line global keyframes keyframes = sorted(list(set(cmds.keyframe(obj, q=True, time=(startFrame,endFrame), timeChange=True)))) # Creates the arrays for the required point positions points = [] centerPoints = [] centerRotates = [] combinedPoints = [] # Special cases for controllers that are named differently than their joints if obj == "L_foot_CTL" or obj == "R_foot_CTL": loc = obj[:-4] + "Ankle_LOC" elif obj == "M_upTorso_CTL": loc = "M_spineTip_LOC" else: loc = obj[:-3] + "LOC" # Grabs the original world space position to calculate the approraite motion points locPos = cmds.getAttr(loc+".translate") centerLocPos = cmds.getAttr("M_centerMass_LOC.translate") #for step in range( startFrame, endFrame+2, int(curveCVstep)): for step in range(len(keyframes)): # Moves throughout the specified timeline to find point results cmds.currentTime( keyframes[step] ) if obj != "M_upTorso_CTL": # Queries the position of the controller to draw the curve # Adds the position of the controller in world space to draw it relative to the control pos = cmds.xform( obj,q=True,ws=True,t=True ) pos[0] = pos[0] + locPos[0][0] pos[1] = pos[1] + locPos[0][1] pos[2] = pos[2] + locPos[0][2] # convert the tuple (vector) to a string points.append(pos) print pos else: spineLength = cmds.getAttr('spineCurveInfo.arcLength') # Queries the position of the controller to draw the curve # Adds the position of the controller in world space to draw it relative to the control # adds in the spine length to the y position to take into consideration the offset of the centerMass controller pos = cmds.xform( obj,q=True,ws=True,t=True ) pos[0] = pos[0] + locPos[0][0] pos[1] = pos[1] + locPos[0][1] pos[2] = pos[2] + locPos[0][2] # convert the tuple (vector) to a string print "Printing out points" points.append(pos) print pos # Queries the position of the center of mass controller centerPos = cmds.xform( "M_centerMass_CTL",q=1,os=1,t=1 ) centerPos[0] = centerPos[0] #+ centerLocPos[0][0] centerPos[1] = centerPos[1] #+ centerLocPos[0][1] centerPos[2] = centerPos[2] #+ centerLocPos[0][2] # convert the tuple (vector) to a string print "Printing out center Points" centerPoints.append(centerPos) print centerPos # Combine the two point positions to find the relative position combinedPos = [] combinedPos1 = pos[0] + centerPos[0] combinedPos.append(combinedPos1) combinedPos2 = pos[1] + centerPos[1] combinedPos.append(combinedPos2) combinedPos3 = pos[2] + centerPos[2] combinedPos.append(combinedPos3) print "Printing out combined Points" print combinedPos # Queries the rotation of the center of mass controller #centerRot = cmds.xform( "M_centerMass_CTL",q=1,ws=1,ro=1 ) #centerRotates.append(centerRot) #print "Printing out rotations" #print centerRot # applies rotation of the center of mass controller to the upper torso controller # rotation around the Z axis #tempX = combinedPos[0]*math.cos(math.radians(centerRot[2])) - combinedPos[1]*math.sin(math.radians(centerRot[2])) #tempY = combinedPos[0]*math.sin(math.radians(centerRot[2])) + combinedPos[1]*math.cos(math.radians(centerRot[2])) # rotation around the Y axis #tempX2 = tempX*math.cos(math.radians(centerRot[1])) + combinedPos[2]*math.sin(math.radians(centerRot[1])) #tempZ = combinedPos[2]*math.cos(math.radians(centerRot[1])) - tempX*math.sin(math.radians(centerRot[1])) # rotation around the X axis #tempY2 = tempY*math.cos(math.radians(centerRot[0])) - tempZ*math.sin(math.radians(centerRot[0])) #tempZ2 = tempY*math.sin(math.radians(centerRot[0])) + tempZ*math.cos(math.radians(centerRot[0])) #combinedPos[0] = tempX2 #combinedPos[1] = tempY2 #combinedPos[2] = tempZ2 #print "Printing out rotated Points" combinedPoints.append(combinedPos) print combinedPos # if the obj is the upper torso controller we need to take into consideration the center of mass controller # Creates the motion curve with the required cvs if obj == "M_upTorso_CTL": cur = cmds.curve(d=2, ws=True, p=combinedPoints, n=obj[:-3]+'Path') cmds.setAttr(cur + '.overrideEnabled', 1) cmds.setAttr(cur + '.overrideColor', color) print cur cmds.move(points[0][0], points[0][1], points[0][2], cur+".scalePivot", cur+".rotatePivot", absolute=True) else: cur = cmds.curve(d=2, ws=True, p=points, n=obj[:-3]+'Path') cmds.setAttr(cur + '.overrideEnabled', 1) cmds.setAttr(cur + '.overrideColor', color) print cur cmds.move(points[0][0], points[0][1], points[0][2], cur+".scalePivot", cur+".rotatePivot", absolute=True) # command that runs through each cv of the curve and returns their position within a list. cvs = cmds.getAttr( obj[:-3]+'Path.cv[*]' ) print cvs global initCVS initCVS = cvs # Create a locator for the motion path that the controller will now follow locate = cmds.spaceLocator( n=obj[:-3]+"Path_LOC" ) #for step in range( startFrame, endFrame+2, int(curveCVstep)): for step in range(len(keyframes)): # Moves throughout the specified timeline to find point results cmds.currentTime( keyframes[step] ) # Moves the locator to match the position of the controller cmds.move( cvs[step][0], cvs[step][1], cvs[step][2], locate) # Keyframes the locator cmds.setKeyframe( locate ) # Position obj at the location of locate. cmds.pointConstraint( locate, obj, n=obj[:-3]+"LOC1_PNT" ) cmds.setAttr( loc+'.visibility', 0) # keys the weight of the point constraint to 0 before and after time frame (set to 1 during time frame) #Before startFrame cmds.currentTime( startFrame - 1 ) cmds.setAttr(obj+'.blendPoint1', 0 ) cmds.setKeyframe(obj+'.blendPoint1' ) #After startframe cmds.currentTime( startFrame ) cmds.setAttr(obj+'.blendPoint1', 1 ) cmds.setKeyframe(obj+'.blendPoint1' ) #Before endframe cmds.currentTime( endFrame ) cmds.setAttr(obj+'.blendPoint1', 1 ) cmds.setKeyframe(obj+'.blendPoint1' ) #After endframe cmds.currentTime( endFrame + 1 ) cmds.setAttr(obj+'.blendPoint1', 0 ) cmds.setKeyframe(obj+'.blendPoint1' ) cmds.select(obj)

2条回答

网友

1楼 · 编辑于 2024-09-23 06:30:55

如果您只是想获得某物的世界空间位置，可以使用：

position = cmds.xform(item, q=True, ws=True, t=True)

然后根据需要使用位置数据-不管任何父对象如何旋转，它都可以工作。。。xform命令还可用于设置对象在世界空间中的位置：

^{pr2}$

我不确定这是否真的回答了你的问题-有点不清楚你想在你的代码中实现什么；我不能完全理解定位器和点约束被打开/关闭的原因。你想创建一个可编辑的运动轨迹吗？在

如果是，您是否尝试过使用Maya的内置editable motion trail工具？在

如果出于某种原因，你想自己制作，我想你可以遵循“两步走”的方法，首先创建一条曲线，其中每个cv在指定的开始/结束时间内位于控件的世界空间位置。然后编辑曲线cv位置以清理圆弧并运行一个单独的函数，该函数查询每个cv的世界空间位置，然后将它们应用于控件并在适当的时间设置关键帧。由于您是在世界空间位置执行所有这些操作，所以不需要担心任何父位置/旋转（幸运的是，这会使代码相对简单）。在

网友

2楼 · 编辑于 2024-09-23 06:30:55

我刚才的另一个想法是将temp定位器设置为控件的父级（位于控件的轴上）。然后可以使用定位器中的worldPositionxyz attr值来绘制曲线点。创建曲线后，可以删除定位器。在

通过将定位器定位在控件的轴上来绘制曲线，它应该可以让你在不太头痛的情况下做约束性的事情（至少在理论上是这样）。因为定位器已经有了一个“易于查询”的世界空间位置值，所以它也不需要太多的数学运算。在

当然，这并不像做所有的数学计算那么酷，但是如果它有效的话。。。在

相关问题更多 >

编程相关推荐

热门问题

热门文章