Category: Maya Python API

Small practical example with Maya API python functionalities
Generate Rotation matrix using 3 vectors (normal, tangent, up)
Download Source Code

import maya.OpenMaya as OpenMaya

def main():
    m_color = ( 0.0, 1.0, 0.0, 1.0 )
    m_color = float4Torgba(m_color)    
    generateTexture("c:/tmp","color01",m_color)

def generateTexture(m_path,m_fileName,m_color):
    try:
        m_util = OpenMaya.MScriptUtil
        #-------------
        m_height = 16
        m_width = 16
        m_depth = 4
        #-------------
        m_image = OpenMaya.MImage()
        m_image.create(m_height, m_width, m_depth )
        m_pixels = m_image.pixels()
        #-------------
        m_arrayLen = m_width * m_height * m_depth
        for i in range(0, m_arrayLen, m_depth):
            m_util.setUcharArray(m_pixels, i+0, m_color[0])    
            m_util.setUcharArray(m_pixels, i+1, m_color[1])
            m_util.setUcharArray(m_pixels, i+2, m_color[2])
            m_util.setUcharArray(m_pixels, i+3, 0)
        m_image.setPixels(m_pixels, m_height, m_width)        
        m_image.writeToFile( "{}/{}.png".format(m_path,m_fileName), '.png' )
    except:
        OpenMaya.MGlobal.displayWarning("Can't save file to {}/{}.png".format(m_path,m_fileName))
        return False
    else:
        return True
        
def float4Torgba((m_r,m_g,m_b,m_a)):
    m_red   = int(m_r * 255.0)
    m_green = int(m_g * 255.0)
    m_blue  = int(m_b * 255.0)
    m_alpha = int(m_a * 255.0)
    return (m_red, m_green, m_blue, m_alpha)

main()

The same like in 3dsmax. Attach polygons via Maya Python Api and Maya cmds to existing mesh.
Not combine, no cheating. Also with skinning support.
Limitation : very slow.
Download : attachObjects.zip

Just unzip the script into C:/maya_scripts/modeling and make a Python shelf button in Maya with this code:

import sys
import maya.cmds as cmds 
path = 'C:/maya_scripts/modeling'
if path not in sys.path:
    sys.path.append(path) 
import attachObjects; attachObjects.main();

Quick example working with OpenMaya.MFnMesh setUV and assignUV.
Limitation : works only on objects with no construction history.
Download : apiGenerateUV.zip

Download : vtxNormalsToSoftHardEdges.zip
Usage:

 
import vtxNormalsToSoftHardEdges; vtxNormalsToSoftHardEdges.convertNormals();

Quick example

 
import maya.OpenMaya as OpenMaya

m_obj       = OpenMaya.MObject() # should get from any code above
m_dagPath   = OpenMaya.MDagPath()
if m_obj.hasFn( OpenMaya.MFn.kDagNode ):
    OpenMaya.MDagPath.getAPathTo( m_obj, m_dagPath )
    print( m_dagPath.fullPathName() )

Quick example

 
import maya.OpenMaya as OpenMaya

m_iterator = OpenMaya.MItDag( OpenMaya.MItDag.kDepthFirst )
while not m_iterator.isDone():
	m_obj   = m_iterator.currentItem()
	m_objFn = OpenMaya.MFnDagNode( m_obj )
	#if ( OpenMaya.MFn.kMesh == m_obj.apiType() ):
	print( m_objFn.fullPathName() )
	m_iterator.next()  

Select the node and run:

 
m_list = getAllExtraAttributes()
print( m_list )

 
import maya.OpenMaya as OpenMaya

m_iterator = OpenMaya.MItDependencyNodes( OpenMaya.MFn.kFileTexture )
m_nodeFn   = OpenMaya.MFnDependencyNode()

while not m_iterator.isDone():
    m_object = m_iterator.thisNode()
    m_nodeFn.setObject( m_object )
    print( "  --- {0} --- ".format( m_nodeFn.name()) )
    for i in range( m_nodeFn.attributeCount() ):
        m_atrr   = m_nodeFn.attribute(i)
        m_fnAttr = OpenMaya.MFnAttribute( m_atrr )
        print( m_fnAttr.name() )
    m_iterator.next()

Dealt Maya API. Here I decided to post some example functions. The basic idea was using Maya API Python classes realize workflow with extra attributes at native Maya node. Suppose you want to make a script that stores some data in one native Maya node (in the script node, for example), and if user do not have your script, nothing terrible will happen, node modified by you will work without any troubles. Sorry for my English.

You should get something like this: