如何解决使用python脚本在Blender的关键帧处将对象链接到父对象
我想在第40帧将对象链接到其父对象,然后在第80帧取消链接。我觉得它应该是这样的:
o.parent = p
o.keyframe_insert(data_path="???",index=-1,frame=40)
o.parent = None
o.keyframe_insert(data_path="???",frame=80)
谢谢!
解决方法
在谷歌搜索和实验之后,我提出了一个小例子,说明如何设置和取消(又影响)Child Of约束。
import bpy
def add_frame(oArgObject,sArgType,dArgFrame,sArgName):
if sArgType == 'location':
oArgObject.keyframe_insert(data_path='location',index=-1,frame=dArgFrame)
elif sArgType == 'influence':
oArgObject.keyframe_insert(data_path='constraints["'+sArgName+'"].influence',frame=dArgFrame)
else:
print('Unrecognized frame option: ' + sArgType)
def add_parent(oArgChild,oArgParent,bArgScale):
sName = 'Child' + oArgChild.name + 'Parent' + oArgParent.name
if sName in oArgChild.constraints:
print('Constraint ' + sName + ' exists')
else:
oConst = oArgChild.constraints.new(type = 'CHILD_OF')
oConst.name = sName
oConst.target = oArgParent
oConst.use_scale_x = bArgScale[0]
oConst.use_scale_y = bArgScale[1]
oConst.use_scale_z = bArgScale[2]
print('Constraint ' + sName + ' added')
def set_influence(oArgChild,dArgInfluence):
sName = 'Child' + oArgChild.name + 'Parent' + oArgParent.name
if sName in oArgChild.constraints:
index = 0
while oArgChild.constraints[index].name != sName:
index += 1
o = oArgChild.constraints[index]
o.influence = 1 - dArgInfluence
add_frame(oArgChild,'influence',dArgFrame-1,sName)
o.influence = dArgInfluence
add_frame(oArgChild,sName)
else:
print('No constraints exists for object ' + oArgChild.name)
bpy.ops.object.select_all(action='SELECT')
bpy.ops.object.delete()
bpy.ops.mesh.primitive_cube_add(size = 1,location = (1,0))
oParent1 = bpy.context.object
oParent1.scale = (0.5,1.0,0.5)
oParent1.name = 'Parent1'
add_frame(oParent1,'location',10,'n/a')
oParent1.location.x += 4
add_frame(oParent1,50,'n/a')
bpy.ops.mesh.primitive_cube_add(size = 1,location = (0,1,0))
oParent2 = bpy.context.object
oParent2.scale = (1.0,0.5,0.5)
oParent2.name = 'Parent2'
add_frame(oParent2,60,'n/a')
oParent2.location.y += 4
add_frame(oParent2,100,1))
oChild = bpy.context.object
oChild.scale = (0.5,1.0)
oChild.name = 'Child'
add_frame(oChild,5,'n/a')
add_parent(oChild,oParent1,(True,True,True))
add_parent(oChild,oParent2,(False,False,False))
set_influence(oChild,20,1)
set_influence(oChild,40,0)
set_influence(oChild,70,90,0)
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