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#usda 1.0
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(
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subLayers = [
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@usdGeom/schema.usda@
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]
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)
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over "GLOBAL" (
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customData = {
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string libraryName = "usdVol"
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string libraryPath = "pxr/usd/usdVol"
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dictionary libraryTokens = {
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dictionary field = {
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string doc = """This is the namespace prefix used to
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specify the fields that make up a volume primitive."""
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}
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}
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}
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)
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{
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}
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class Volume "Volume" (
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inherits = </Gprim>
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doc = """A renderable volume primitive. A volume is made up of any number
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of FieldBase primitives bound together in this volume. Each
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FieldBase primitive is specified as a relationship with a
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namespace prefix of "field".
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The relationship name is used by the renderer to associate
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individual fields with the named input parameters on the volume
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shader. Using this indirect approach to connecting fields to
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shader parameters (rather than using the field prim's name)
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allows a single field to be reused for different shader inputs, or
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to be used as different shader parameters when rendering different
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Volumes. This means that the name of the field prim is not
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relevant to its contribution to the volume prims which refer to
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it. Nor does the field prim's location in the scene graph have
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any relevance, and Volumes may refer to fields anywhere in the
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scene graph. **However**, unless Field prims need to be shared
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by multiple Volumes, a Volume's Field prims should be located
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under the Volume in namespace, for enhanced organization."""
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)
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{
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}
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class "FieldBase" (
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inherits = </Xformable>
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doc = """Base class for field primitives."""
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)
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{
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}
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class "FieldAsset" (
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doc = "Base class for field primitives defined by an external file."
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inherits = </FieldBase>
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)
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{
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asset filePath (
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doc = """An asset path attribute that points to a file on disk.
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For each supported file format, a separate FieldAsset
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subclass is required.
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This attribute's value can be animated over time, as most
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volume asset formats represent just a single timeSample of
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a volume. However, it does not, at this time, support
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any pattern substitutions like \"$F\". """
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)
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token fieldName (
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doc = """Name of an individual field within the file specified by
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the filePath attribute."""
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)
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int fieldIndex (
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doc = """A file can contain multiple fields with the same
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name. This optional attribute is an index used to
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disambiguate between these multiple fields with the same
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name."""
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)
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token fieldDataType (
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doc = """Token which is used to indicate the data type of an
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individual field. Authors use this to tell consumers more
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about the field without opening the file on disk. The list of
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allowed tokens is specified with the specific asset type.
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A missing value is considered an error."""
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)
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token vectorDataRoleHint = "None" (
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allowedTokens = ["None", "Point", "Normal", "Vector", "Color"]
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doc = """Optional token which is used to indicate the role of a vector
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valued field. This can drive the data type in which fields
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are made available in a renderer or whether the vector values
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are to be transformed."""
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)
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}
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class Field3DAsset "Field3DAsset" (
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doc = """Field3D field primitive. The FieldAsset filePath attribute must
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specify a file in the Field3D format on disk."""
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inherits = </FieldAsset>
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)
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{
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token fieldDataType (
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allowedTokens = ["half", "float", "double",
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"half3", "float3", "double3"]
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doc = """Token which is used to indicate the data type of an
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individual field. Authors use this to tell consumers more
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about the field without opening the file on disk. The list of
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allowed tokens reflects the available choices for Field3d
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volumes."""
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)
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token fieldPurpose (
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doc = """Optional token which can be used to indicate the purpose or
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grouping of an individual field. Clients which consume Field3D
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files should treat this as the Field3D field \\em name."""
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)
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}
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class OpenVDBAsset "OpenVDBAsset" (
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doc = """OpenVDB field primitive. The FieldAsset filePath attribute must
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specify a file in the OpenVDB format on disk."""
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inherits = </FieldAsset>
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)
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{
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token fieldDataType (
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allowedTokens = ["half", "float", "double", "int", "uint", "int64",
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"half2", "float2", "double2", "int2",
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"half3", "float3", "double3", "int3",
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"matrix3d", "matrix4d", "quatd",
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"bool", "mask", "string"]
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doc = """Token which is used to indicate the data type of an
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individual field. Authors use this to tell consumers more
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about the field without opening the file on disk. The list of
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allowed tokens reflects the available choices for OpenVDB
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volumes."""
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)
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token fieldClass (
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allowedTokens = ["levelSet", "fogVolume", "staggered", "unknown"]
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doc = """Optional token which can be used to indicate the class of
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an individual grid. This is a mapping to openvdb::GridClass
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where the values are GRID_LEVEL_SET, GRID_FOG_VOLUME,
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GRID_STAGGERED, and GRID_UNKNOWN."""
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)
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}
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