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USDCollectionの基本操作

ipynbFile USDCollectoinSample__USDCollectionの基本操作.ipynb

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from pxr import Usd, UsdGeom, Sdf, Gf, UsdUtils

newScn = Usd.Stage.CreateInMemory()

path = Sdf.Path("/World")
worldGeom = UsdGeom.Xform.Define(newScn, path)
sphereGeom = UsdGeom.Sphere.Define(newScn, path.AppendChild("Sphere"))
prim = worldGeom.GetPrim()
spherePrim = sphereGeom.GetPrim()

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api = Usd.CollectionAPI.ApplyCollection(prim, 'test')
api.IncludePath(spherePrim.GetPath())

Success

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True

In [47]:

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# expansionRule は explicitOnly(指定Pathを明確に指定？)
# expandPrims は rel-targets以下のすべてのPrim こっちがデフォルト
print(newScn.GetRootLayer().ExportToString())

Success

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#usda 1.0

def Xform "World" (
    prepend apiSchemas = ["CollectionAPI:test"]
)
{
    uniform token collection:test:expansionRule = "expandPrims"
    prepend rel collection:test:includes = </World/Sphere>

    def Sphere "Sphere"
    {
    }
}

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collection = Usd.CollectionAPI.GetCollection(prim, 'test')
# Collection名取得
print(collection.GetName())
# CollectionまでのPathを取得
print(collection.GetCollectionPath())
# CollectionはRelation構造になってるので、ソレを利用してPrimを取得
print(collection.GetIncludesRel().GetTargets())

Success

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test
/World.collection:test
[Sdf.Path('/World/Sphere')]

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# Getでも取得できるぽい
print(Usd.CollectionAPI.Get(prim, 'test'))

Success

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<pxr.Usd.CollectionAPI object at 0x0000000006CD5C48>