312 lines
9.2 KiB
Markdown
312 lines
9.2 KiB
Markdown
---
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title: Maya Python笔记
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date: 2022-08-09 13:55:15
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tags: Maya
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rating: ⭐️⭐️
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---
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# 前言
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# 前期准备
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开发环境搭建:https://www.jianshu.com/p/813b2cc71ca2
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《Maya Python游戏与影视编程指南》这个书还是挺不错的。
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# VSCode插件
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除了必须的Python(打开一个Py文件就会提示安装),我使用的是MayaPy与MayaCode。
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# Maya开启端口
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在Maya中开启端口,这样就可以在VSCode中将代码直接发送到Maya中执行。
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## Mel
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commandPort -name "localhost:7001" -sourceType "mel" -echoOutput;
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## Python
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```python
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import maya.cmds as cmds
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cmds.commandPort(name=":7001", sourceType="mel",echoOutput=True)
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```
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建议建一个脚本文件,这样就不用每次启动都手动开启端口了。以Python为例,把上面Python代码复制到新建的.py文件中,放到下面目录:
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```s
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Windows: <drive>:\Documents and Settings\<你的windows用户名>\My Documents\maya\<你maya的版本号>\scripts
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(其实就是我的文档下面maya文件夹)
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MacOSX: ~/Library/Preferences/Autodesk/maya/<你maya的版本号>/scripts.
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Linux: ~/maya/<你maya的版本号>/scripts.
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```
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# Maya Python路径设置及代码自动补全
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VS Code中按Ctrl+Shift+P,输入Settings打开settings.json配置文件,在大括号里加入下面代码:
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```
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//python.pythonPath是指定Python命令路径,请根据你maya的安装路径来做修改
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"python.pythonPath": "C:/Program Files/Autodesk/Maya2019/bin/mayapy.exe",
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//python.autoComplete.extraPaths是代码自动补全路径,同样根据你自己的maya安装路径来写
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"python.autoComplete.extraPaths": "C:/Program Files/Autodesk/Maya2019/devkit/other/pymel/extras/completion/py"
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```
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注意:settings.json文件中,每一项设置用","隔开,最后一项设置后面没有",",如果报错,检查一下是不是这里出现了问题。
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# Flag参数
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```
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-e -edit
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-q -query
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-ax. -axis Length Length Length
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-cch -caching onloff
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-ch -constructionHistory onloff
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-cuv -createUVs Int
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-d -depth Length
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-h -height Length
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-n - name String
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- nds - nodeState Int
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-0 -object onlof f
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-sd -subdivisionsDepth Int
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-sh - subdivisionsHeight Int
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-sw -subdivis ionsWidth Int
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-SX -subdivisionsX Int
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-sy -subdivisionsY Int
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-sz - subdivisionsZ Int
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-tx -texture Int
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-W -width Length
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```
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## 查询参数
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使用以下命令可以查询具体函数的flag,例如polyCube:
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```
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print(cmds.help('polyCube'));
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```
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结果为:
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```
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Synopsis: polyCube [flags] [String...]
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Flags:
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-e -edit
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-q -query
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-ax -axis Length Length Length
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-cch -caching on|off
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-ch -constructionHistory on|off
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-cuv -createUVs Int
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-d -depth Length
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-fzn -frozen on|off
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-h -height Length
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-n -name String
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-nds -nodeState Int
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-o -object on|off
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-sd -subdivisionsDepth Int
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-sh -subdivisionsHeight Int
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-sw -subdivisionsWidth Int
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-sx -subdivisionsX Int
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-sy -subdivisionsY Int
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-sz -subdivisionsZ Int
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-tx -texture Int
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-w -width Length
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```
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# 【10】Select Objects
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选择在Maya里要分为两部分作用,一个是从选择里获取,一个是把数据设置给当前选择的东西。
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要想从外界传数据进脚本,方法之一就是从maya的选择列表里拿物体数据
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```python
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import maya.cmds as cmd
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selectObjectList = cmd.ls(orderedSelection = True)
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print selectObjectList
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```
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把属性设置给选择的物体,这时我们需要手动调用select命令,因为有写操作是只能对选择物体生效的,所以在执行这些操作之前需要在代码里先选中这个物体。如果场景里面有个pSphere1物体
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```python
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import maya.cmds as cmd
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cmd.select('pSphere1')
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清除空选择列表:
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import maya.cmds as cmd
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cmd.select(clear = True)
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加选
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import maya.cmds as cmd
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cmd.select('pSphere1')
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cmd.select('pSphere2', add = True)
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```
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从列表中获取所有节点
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```python
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nodes=cmds.ls();
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print(nodes)
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```
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添加类型限制
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```python
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nodes=cmds.ls(type='transform');
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print(nodes)
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```
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字符串配合通配符*
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```python
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nodes = cmds.ls('joint*');
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print(nodes);
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```
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选中指定的物体
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```python
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cmds.select('side*','top*');
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```
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select指令与ls指令可以结合使用,例如:
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```python
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cmds.ls(sl=True);
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cmds.select(cmds.ls('joint*'));
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```
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# getAttr与setAttr
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通过字符串获取属性,不容易报错。
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```python
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loc=cmds.spaceLocator()[0]
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sx=cmds.getAttr(loc+'.scaleX')
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print(sx)
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```
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但注意,因为不确定类型,所以请注意数据格式
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# 对应的容器
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有数组、map与set
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## 序列操作符
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```
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x in s 如在在序列中则返回true
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x not in s 如果不在序列中则返回true
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s+t 串联
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s[i] s序列中的第i项
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s[i:j] 取得指定范围的成员
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s[i:j:k] 取得指定范围的成员,k为步长
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len(s) 长度
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min(s) 最小项
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max(s) 最大项
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s.index(x) 第一次出现的index
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s.count(x) 出现次数
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```
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# 可变参数的函数
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```python
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def function1(*args):
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print(args[0],args[1:]);
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```
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两个**则代表Map
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# cmds.file
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可以用于保存、新建、打开新场景。
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# 模块
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查看全局与本地队友对象:globals()与locals()
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```
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__main__ #为当前MayaPython编辑器模块。
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__file__ #文件绝对路径
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__package__ #所在包名
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```
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在一个文件夹中放入一个__init__.py与其他*.py文件,之后就可以
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```python
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import 文件夹名;
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文件夹名.py名.function()
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```
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调用函数
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# 路径
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```python
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import sys;
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for p in sys.path:
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print(p)
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```
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# 类
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```python
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class NewClass(object):
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pass;
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```
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实例化
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```python
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instance1=NewClass();
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instance2=NewClass();
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```
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构造函数
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```python
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class Human(object):
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def __init__(self):
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self.first_name='aaaa';
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self.last_name='bbbb';
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```
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# PyMel
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PyMel与maya.cmds不同在于,它返回的不是字符串,而是一个PyNode对象。它可以直接修改节点属性值,无需调用getAttr与setAttr。更加适合于习惯了OOP语言人士使用。同时PyMel可以简化GUI的构建。
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# GUI
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开发包里有一些案例文件可以参考:
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- devkit\pythonScripts\widgetHierarchy.py
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推荐使用Maya安装目录下的designer.exe
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安装 PySide2:安装 python 后,在安装目录下有 /script 文件夹,里面有 pip.exe ,cmd执行:pip install PySide,pip install PySide2(注意: python2.x 对应 PySide,python3.x 对应PySide2)pyside-uic.exe 位于Python的安装目录下
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## python HumanIK
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无效 https://forums.autodesk.com/t5/maya-programming/python-hik/td-p/4262564
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https://forums.autodesk.com/t5/maya-animation-and-rigging/pythonic-mel-way-to-retarget-hik/td-p/7609798
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## 文档
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- http://help.autodesk.com/view/MAYAUL/2018/ENU/?guid=GUID-CEC1D76B-7568-4DCA-B80B-1DE49362492C&pl=CHS
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- http://help.autodesk.com/cloudhelp/2018/JPN/Maya-Tech-Docs/PyMel/generated/pymel.core.animation.html
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## Pyside2文档
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百度的时候请搜索PyQt5
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https://doc.qt.io/qtforpython/modules.html
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## 信号槽与解决生命周期问题
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其中SIGNAL需要先导入
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```python
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from PySide2.QtCore import SIGNAL, QObject
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class MainWindow(QWidget, Ui_Form):
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def slotBtnClicked(self):
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msgBox = QMessageBox(self)
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msgBox.setText(u"The document has been modified.")
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msgBox.setInformativeText(u"Do you want to save your changes?")
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msgBox.setStandardButtons(QMessageBox.Save)
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msgBox.setDefaultButton(QMessageBox.Save)
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msgBox.show()
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def __init__(self, parent=None):
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self.pushButton_stop.clicked.connect(self.slotBtnClicked)
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QObject.connect(self.pushButton_targetSkin,SIGNAL('clicked()'), self.slotBtnClicked)
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```
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# FBX Mel文档
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https://knowledge.autodesk.com/zh-hans/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2019/CHS/Maya-DataExchange/files/GUID-335F2172-DD4D-4D79-B969-55238C08F2EF-htm.html
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# FBX导出
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```
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# FBX Exporter options. Set as required.
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# You can find a reference guide here: http://download.autodesk.com/us/fbx/20112/Maya/_index.html
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# Just add/change what you need.
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# Geometry
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mm.eval("FBXExportSmoothingGroups -v true")
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mm.eval("FBXExportHardEdges -v false")
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mm.eval("FBXExportTangents -v false")
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mm.eval("FBXExportSmoothMesh -v true")
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mm.eval("FBXExportInstances -v false")
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mm.eval("FBXExportReferencedContainersContent -v false")
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# Animation
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mm.eval("FBXExportBakeComplexAnimation -v true")
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mm.eval("FBXExportBakeComplexStart -v "+str(exportStartFrame[x]))
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mm.eval("FBXExportBakeComplexEnd -v "+str(exportEndFrame[x]))
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mm.eval("FBXExportBakeComplexStep -v 1")
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# mm.eval("FBXExportBakeResampleAll -v true")
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mm.eval("FBXExportUseSceneName -v false")
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mm.eval("FBXExportQuaternion -v euler")
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mm.eval("FBXExportShapes -v true")
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mm.eval("FBXExportSkins -v true")
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# Constraints
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mm.eval("FBXExportConstraints -v false")
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# Cameras
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mm.eval("FBXExportCameras -v false")
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# Lights
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mm.eval("FBXExportLights -v false")
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# Embed Media
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mm.eval("FBXExportEmbeddedTextures -v false")
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# Connections
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mm.eval("FBXExportInputConnections -v false")
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# Axis Conversion
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mm.eval("FBXExportUpAxis y")
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# Export!
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mm.eval("FBXExport -f "+exportNames[x]+".fbx -s")
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``` |