为什么在没有对象的情况下maya会显示值错误？

Question

我正在听一个课堂讲座，它是 Maya 中的 Python，我遇到了第 18 行“没有对象匹配名称：p”的问题，我不确定这意味着什么，

p

它的引用来自单词 point，它应该利用来自球体位置的信息。

import maya.cmds as cmds
import random

def create_random_sphere():

    x = random.uniform (-100,100)
    y = random.uniform (-100,100)
    z = random.uniform (-100,100)
    
    sphere = cmds.polySphere()[0]
    
    cmds.move(x,y,z, sphere)
    
    return sphere
    
def create_pipe(start,end):

    cmds.curve(degree = 1, point=[cmds.xform(start,query=True,translation=True), cmds.xform(end,query=True,translation=True)])

    return curve

def create_spheres_pipes(num_spheres):
    spheres = []
    
    for i in range(num_spheres):
        create_random_sphere()
        spheres.append(sphere)
        
    pipes = []
    
    for i in range(len(spheres)-1):
        create_pipe(sphere[i],spheres[i+1])
        pipes.append(pipe)
        
    pipe= create_pipe(spheres[-1],spheres[0])
    pipes.append(pipe)
    return spheres, pipes

def createspheresandpipes(num_spheres):
    spheres, pipes = create_spheres_pipes(num_spheres)
    
    circle = cmds.circle(normal=(0,1,0),radius= 0.2)
    
    for pipe in pipes:
        cmds.select(circle[0],pipe)
        cmds.extrude(et=2,ucp=1,fpt= True,upn=True)
createspheresandpipes(10)

目标是制作一堆随机生成的球体，并用管道连接它们，我无法生成管道。

Answer 1

到处都是错别字。

首次运行代码时，我得到以下信息：

# Traceback (most recent call last):
#   File "<maya console>", line 47, in <module>
#   File "<maya console>", line 40, in createspheresandpipes
#   File "<maya console>", line 27, in create_spheres_pipes
# NameError: global name 'sphere' is not defined #

为了解决这个问题，我将第 26 行从

create_random_sphere()

更改为

sphere = create_random_sphere()

。

再次运行我得到您当前的问题：

# Traceback (most recent call last):
#   File "<maya console>", line 47, in <module>
#   File "<maya console>", line 40, in createspheresandpipes
#   File "<maya console>", line 32, in create_spheres_pipes
#   File "<maya console>", line 18, in create_pipe
# ValueError: No object matches name: p # 

在第 32 行，将

create_pipe(sphere[i],spheres[i+1])

更改为

create_pipe(spheres[i],spheres[i+1])

进行修复。

结果是

# Traceback (most recent call last):
#   File "<maya console>", line 47, in <module>
#   File "<maya console>", line 40, in createspheresandpipes
#   File "<maya console>", line 32, in create_spheres_pipes
#   File "<maya console>", line 20, in create_pipe
# NameError: global name 'curve' is not defined # 

通过将第 18 行从

cmds.curve(...

更改为

curve = cmds.curve(...

来修复。

结果是：

# Error: local variable 'pipe' referenced before assignment
# Traceback (most recent call last):
#   File "<maya console>", line 47, in <module>
#   File "<maya console>", line 40, in createspheresandpipes
#   File "<maya console>", line 33, in create_spheres_pipes
# UnboundLocalError: local variable 'pipe' referenced before assignment #

因为在第 32 行你做了

create_pipe(spheres[i],spheres[i+1])

而不是

pipe = create_pipe(spheres[i],spheres[i+1])

之后运行它会产生以下结果：