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# customImagePlane.py

    #-
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    #+

    #
    # Description:
    #   Demonstrates how to create your own custom image plane based on
    #   Maya's internal image plane classes. This allows API users to
    #   override the default Maya image plane behavior. This class works
    #   like typical API nodes in that it can have a compute method and
    #   can contain static attributes added by the API user.  This
    #   example class overrides the default image plane behavior and
    #   allows users to add transparency to an image plane using the
    #   transparency attribute on the node. Note, this code also
    #   illustrates how to use MImage to control the floating point
    #   depth buffer.  When useDepthMap is set to true, depth is added
    #   is added to the image such that half of the iamge is at the near
    #   clip plane and the remaining half is at the far clip plane.
    #
    #   Note, once the image plane node has been created it you must
    #   attached it to the camera shape that is displaying the node.
    #   Image planes are attached to cameras via the imagePlane message
    #   attribute on the camera shape.  To attach this example image
    #   plane you should connect the image plane's message attribute to
    #   the cameraShapes imagePlane attribute.  Note, the imagePlane
    #   attribute is a multi attribute and can hold references to
    #   multiple image planes.
    #
    #   This example works only with renderers that use node evaluation
    #   as a part of the rendering process, e.g. Maya Software. It does
    #   not work with renderes that rely on a scene translation mechanism,
    #   e.g. mental ray.
    #
    # Usage:
    #
    #   Run the script:
    #
    #   import maya
    #   maya.cmds.loadPlugin("customImagePlane.py")
    #   imageP = maya.cmds.createNode("spCustomImagePlane")
    #   maya.cmds.connectAttr( imageP + ".message", "perspShape.imagePlane[0]", force = True )
    #
    #   Then assign an image to the customImagePlane node
    #

    import maya.OpenMaya as OpenMaya
    import maya.OpenMayaMPx as OpenMayaMPx
    import sys

    kPluginNodeTypeName = "spCustomImagePlane"
    kPluginNodeId = OpenMaya.MTypeId(0x87016)

    # Node definition
    class customImagePlane(OpenMayaMPx.MPxImagePlane):
        # class variables
        aTransparency = OpenMaya.MObject()

        # internal variables
        fTransparency = 0.0

        def __init__(self):
            OpenMayaMPx.MPxImagePlane.__init__(self)

        def getInternalValueInContext( self, plug, handle, context ):
            if plug == self.aTransparency:
                handle.setDouble( self.fTransparency )
                return True

            return OpenMayaMPx.MPxImagePlane.getInternalValueInContext( self, plug, handle, context )

        def setInternalValueInContext( self, plug, handle, context ):
            if plug == self.aTransparency:
                self.fTransparency = handle.asDouble()
                self.setImageDirty()
                return True

            return OpenMayaMPx.MPxImagePlane.setInternalValueInContext( self, plug, handle, context )

        def loadImageMap(self, fileName, frame, image):
            try:
                image.readFromFile(fileName)

                # get the width and height of the image an MScriptUtil is needed
                # to pass in a pointer to the MImage::getSize() method
                widthUtil = OpenMaya.MScriptUtil(0)
                widthPtr = widthUtil.asUintPtr()
                heightUtil = OpenMaya.MScriptUtil(0)
                heightPtr = heightUtil.asUintPtr()
                image.getSize( widthPtr, heightPtr )

                width = widthUtil.getUint(widthPtr)
                height = heightUtil.getUint(heightPtr)
                size = width * height

                # Implement transparency
                charPixelPtr = image.pixels()
                for i in range( 0, size, 4 ):
                    alphaIndex = (i*4)+3
                    alpha = OpenMayaScript.getCharArrayItem(charPixelPtr,alphaIndex)
                    OpenMayaScript.setCharArray( alpha * (1.0 - self.fTransparency), alphaIndex )

                # Implement use depth map
                thisNode = self.thisMObject()
                fnThisNode = OpenMaya.MFnDependencyNode(thisNode)
                useDepthMap = fnThisNode.attribute("useDepthMap")
                depthMap = OpenMaya.MPlug( thisNode, useDepthMap )
                value = depthMap.asBool()

                if value:
                    buffer = []
                    c = 0
                    for i in range( 0, height ):
                        for j in range( 0, width ):
                            if i > height/2.0:
                                buffer.insert(c, -1.0)
                            else:
                                buffer.insert(c, 0.0)
                            c+=1

                    depthMapArray = OpenMaya.MScriptUtil()
                    depthMapArray.createFromList( buffer )
                    depthMapArrayFloatPtr = depthMapArray.asFloatPtr()
                    image.setDepthMap( depthMapArrayFloatPtr, width, height )

            except:
                pass

    # creator
    def nodeCreator():
        return OpenMayaMPx.asMPxPtr( customImagePlane() )

    # initializer
    def nodeInitializer():
        nAttr = OpenMaya.MFnNumericAttribute()

        # Setup the input attributes
        customImagePlane.aTransparency = nAttr.create("transparency", "tp", OpenMaya.MFnNumericData.kDouble, 0.0)
        nAttr.setStorable(True)
        nAttr.setInternal(True)
        nAttr.setMin(0.0)
        nAttr.setMax(1.0)
        nAttr.setKeyable(True)

        customImagePlane.addAttribute(customImagePlane.aTransparency)

    # initialize the script plug-in
    def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject, "Autodesk", "1.0", "Any")
        try:
            mplugin.registerNode( kPluginNodeTypeName, kPluginNodeId, nodeCreator, nodeInitializer, OpenMayaMPx.MPxNode.kImagePlaneNode )
        except:
            sys.stderr.write( "Failed to register node: %s" % kPluginNodeTypeName )
            raise

    # uninitialize the script plug-in
    def uninitializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.deregisterNode( kPluginNodeId )
        except:
            sys.stderr.write( "Failed to register node: %s" % kPluginNodeTypeName )
            raise