What's new in USD

11:44 - USD scene structure

def Xform "Root" (
    kind = "sceneLibrary"
)
{
    def Cube "MyCubeScene" (
        sceneName = "My Cube Scene"
    )
    { 
        ... 
    }

    over Sphere "MySphereScene" (
        sceneName = "My Sphere Scene"
    )
    { 
        ... 
    }
}

13:30 - Adding anchoring to USD

def Cube "ImageAnchoredCube" (
    prepend apiSchemas = [ "Preliminary_AnchoringAPI" ]
)
{
    uniform token preliminary:anchoring:type = "image"
    rel preliminary:imageAnchoring:referenceImage = <ImageReference>

    def Preliminary_ReferenceImage "ImageReference"
    {
        uniform asset image = @image.png@
        uniform double physicalWidth = 12
    }

    ...
}

15:11 - Defining a behavior

def Preliminary_Behavior "TapAndBounce"
{
    rel triggers = [ <Tap> ]
    rel actions = [ <Bounce> ]

    def Preliminary_Trigger "Tap"
    {
        uniform token info:id = "tap"
        rel affectedObjects = [ </Cube> ]
    }

    def Preliminary_Action "Bounce"
    {
        uniform token info:id = "emphasize" 
        uniform token motionType = "bounce"
        rel affectedObjects = [ </Cube> ]
    }

    ...
}

16:22 - Compound behavior

def Preliminary_Behavior "TapOrGetCloseAndBounceJiggleAndFlip"
{
    rel triggers = [ <Tap>, <Proximity> ]
    rel actions = [ <Bounce>, <Jiggle>, <Flip> ]

    ...
}

17:19 - Defining physics

def Sphere "WoodenBall" (
    prepend apiSchemas = [ "Preliminary_PhysicsColliderAPI",
                           "Preliminary_PhysicsRigidBodyAPI" ]
)
{
    rel preliminary:physics:collider:convexShape = </WoodenBall>
    double preliminary:physics:rigidBody:mass = 10.0
}

18:15 - Applying a wood material for physics

def Material "Wood" (
    prepend apiSchemas = ["Preliminary_PhysicsMaterialAPI"]
)
{
    double preliminary:physics:material:restitution = 0.603
    double preliminary:physics:material:friction:static = 0.375
    double preliminary:physics:material:friction:dynamic = 0.375
}

def Sphere "WoodenBall" (
    prepend apiSchemas = [ "Preliminary_PhysicsColliderAPI",
                           "Preliminary_PhysicsRigidBodyAPI" ]
)
{
    rel preliminary:physics:collider:convexShape = </WoodenBall>
    double preliminary:physics:rigidBody:mass = 10.0
    rel material:binding = </Wood>
}

18:40 - Defining a ground plane

def Xform "MyScene" (
    prepend apiSchemas = ["Preliminary_PhysicsColliderAPI"]
)
{
    def Preliminary_InfiniteColliderPlane "groundPlane" (
        customData = {
            bool preliminary_isSceneGroundPlane = 1
        }
    ) {
        point3d position = (0, 0, -2)
        vector3d normal = (0, 1, 0)
        rel preliminary:physics:collider:convexShape = </MyScene/groundPlane>
    }
    rel material:binding = </Wood>
}

19:08 - Adding gravity

def Preliminary_PhysicsGravitationalForce "MoonsGravity"
{
    vector3d physics:gravitationalForce:acceleration = (0, -1.625, 0)
}

20:28 - Defining spatial audio

def SpatialAudio "HorseNeigh"
{
    uniform asset filePath        = @Horse.m4a@
    uniform token auralMode       = "spatial"
    uniform timeCode startTime    =  65.0
    uniform double mediaOffset    =  0.33333333333
    double3 xformOp:translate = (0, 0.5, 0.1)
    uniform token[] xformOpOrder = ["xformOp:translate"]
}

21:45 - 3D text

def Preliminary_Text "heading"
{
    string content = "#WWDC20"
    string[] font = [ "Helvetica", "Arial" ]
    token wrapMode = "singleLine"
    token horizontalAlignment = "center"
    token verticalAlignment = "baseline"
}

22:46 - Playback metadata

#usda 1.0
(
    endTimeCode = 300
    startTimeCode = 1
    timeCodesPerSecond = 30
    playbackMode = "loop"
    autoPlay = false
)

def Xform “AnimatedCube"
{
    ...
}

23:08 - Scene understanding metadata

def Xform "Root" (
    kind = "sceneLibrary"
)
{
    def Xform "MyScene" (
        sceneName = "My Scene"
        preliminary_collidesWithEnvironment = true
    )
    {
        def Xform "DigitalBug"
        {
            ...
        }
    }
}