USD/Material/USDMaterial_01__USDでMaterial_ShadingNetwork.ipynb

{"cells":[{"cell_type":"code","execution_count":32,"metadata":{},"outputs":[],"source":["import os.path\n","from pxr import Usd, UsdGeom, Sdf, Gf, UsdShade\n",""]},{"cell_type":"code","execution_count":33,"metadata":{},"outputs":[{"data":{"text/plain":"True"},"execution_count":33,"metadata":{},"output_type":"execute_result"}],"source":["\n","\n","stage = Usd.Stage.CreateInMemory()\n","rootLayer = stage.GetRootLayer()\n","\n","# Mesh作成\n","sphere = UsdGeom.Sphere.Define(stage, '/test/sphere')\n","\n","matPath = Sdf.Path(\"/Model/Material/MyMat\")\n","mat = UsdShade.Material.Define(stage, matPath)\n","shader = UsdShade.Shader.Define(stage, matPath.AppendChild('testShader'))\n","\n","\n","# Shaderのアトリビュート設定\n","# 色をつけただけの基本のPBRシェーダーを作る\n","shader.CreateIdAttr('UsdPreviewSurface')\n","shader.CreateInput('diffuseColor', Sdf.ValueTypeNames.Color3f)\n","shader.CreateInput('metalic', Sdf.ValueTypeNames.Float).Set(0.9)\n","shader.CreateInput('roughness', Sdf.ValueTypeNames.Float).Set(0.2)\n","# カスタムパラメーターもつくれる\n","shader.CreateInput('test', Sdf.ValueTypeNames.Float).Set(1.0)\n","\n","# Shaderの結果をMatにつなげる\n","mat.CreateSurfaceOutput().ConnectToSource(shader, \"surface\")\n","# 別のノードを作って、接続する\n","colorPrim = UsdShade.Shader.Define(stage, '/node/outColor')\n","colorOut = colorPrim.CreateInput('color', Sdf.ValueTypeNames.Color3f)\n","colorOut.Set(Gf.Vec3f(1, 0, 0))\n","shader.GetInput('diffuseColor').ConnectToSource(colorOut)\n","\n","# Bind\n","UsdShade.MaterialBindingAPI(sphere.GetPrim()).Bind(mat)\n",""]},{"cell_type":"code","execution_count":34,"metadata":{},"outputs":[{"name":"stdout","output_type":"stream","text":"#usda 1.0\n\ndef \"test\"\n{\n    def Sphere \"sphere\"\n    {\n        rel material:binding = </Model/Material/MyMat>\n    }\n}\n\ndef \"Model\"\n{\n    def \"Material\"\n    {\n        def Material \"MyMat\"\n        {\n            token outputs:surface.connect = </Model/Material/MyMat/testShader.outputs:surface>\n\n            def Shader \"testShader\"\n            {\n                uniform token info:id = \"UsdPreviewSurface\"\n                color3f inputs:diffuseColor.connect = </node/outColor.inputs:color>\n                float inputs:metalic = 0.9\n                float inputs:roughness = 0.2\n                float inputs:test = 1\n                token outputs:surface\n            }\n        }\n    }\n}\n\ndef \"node\"\n{\n    def Shader \"outColor\"\n    {\n        color3f inputs:color = (1, 0, 0)\n    }\n}\n\n\n"},{"data":{"text/plain":"True"},"execution_count":34,"metadata":{},"output_type":"execute_result"}],"source":["\n","print(stage.GetRootLayer().ExportToString())\n","\n","stage.GetRootLayer().Export(\"D:/matTest.usda\")\n",""]},{"cell_type":"markdown","metadata":{},"source":["![](https://i.gyazo.com/62970445bf4df3ac356150956fe457f9.jpg)\n","こんな感じ？\n","\n","![](https://gyazo.com/a0af6171ddcf33b7188539928a40b1b3.png)\n","ShadingNetworkも CreateInput と ConnectToSource で表現できる"]}],"nbformat":4,"nbformat_minor":2,"metadata":{"language_info":{"name":"python","codemirror_mode":{"name":"ipython","version":2}},"orig_nbformat":2,"file_extension":".py","mimetype":"text/x-python","name":"python","npconvert_exporter":"python","pygments_lexer":"ipython2","version":2}}