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maya python api 2.0 node example which evaluates with respect to node's state
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| # encoding: utf8 | |
| import maya.api.OpenMaya as om | |
| import math | |
| def maya_useNewAPI(): | |
| pass | |
| class SimpleNode(om.MPxNode): | |
| node_name = 'simpleNode' | |
| node_id = om.MTypeId(0x83002) | |
| a_arg = None | |
| a_amp = None | |
| a_val = None | |
| def __init__(self): | |
| om.MPxNode.__init__(self) | |
| @staticmethod | |
| def creator(): | |
| return SimpleNode() | |
| @staticmethod | |
| def initialize(): | |
| num_attr = om.MFnNumericAttribute() | |
| SimpleNode.a_arg = num_attr.create('arg', 'arg', om.MFnNumericData.kFloat, 0.0) | |
| num_attr.storable = True | |
| om.MPxNode.addAttribute(SimpleNode.a_arg) | |
| SimpleNode.a_amp = num_attr.create('amp', 'amp', om.MFnNumericData.kFloat, 1.0) | |
| num_attr.storable = True | |
| om.MPxNode.addAttribute(SimpleNode.a_amp) | |
| SimpleNode.a_val = num_attr.create('val', 'val', om.MFnNumericData.kFloat, 0.0) | |
| num_attr.storable = True | |
| num_attr.writable = True | |
| om.MPxNode.addAttribute(SimpleNode.a_val) | |
| om.MPxNode.attributeAffects(SimpleNode.a_arg, SimpleNode.a_val) | |
| om.MPxNode.attributeAffects(SimpleNode.a_amp, SimpleNode.a_val) | |
| def compute(self, plug, data): | |
| # type: (om.MPlug, om.MDataBlock) -> None | |
| state = om.MFnDependencyNode(self.thisMObject()).findPlug('nodeState', False).asInt() | |
| if state == 1: | |
| data.outputValue(SimpleNode.a_val).setFloat(data.inputValue(SimpleNode.a_arg).asFloat()) | |
| return | |
| if plug == SimpleNode.a_val: | |
| arg = data.inputValue(SimpleNode.a_arg).asFloat() | |
| amp = data.inputValue(SimpleNode.a_amp).asFloat() | |
| val_handle = data.outputValue(SimpleNode.a_val) # type: om.MDataHandle | |
| val_handle.setFloat(amp * math.sin(arg)) | |
| data.setClean(plug) | |
| def initializePlugin(obj): | |
| fn_plugin = om.MFnPlugin(obj, 'ilya radovilsky', '1.0') | |
| fn_plugin.registerNode(SimpleNode.node_name, SimpleNode.node_id, SimpleNode.creator, SimpleNode.initialize) | |
| def uninitializePlugin(obj): | |
| fn_plugin = om.MFnPlugin(obj) | |
| fn_plugin.deregisterNode(SimpleNode.node_id) |
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