#usda 1.0
(
    "This file describes the USD Shader (RSL) schemata for code generation."
    subLayers = [
        @usd/schema.usda@,
        @usdShade/schema.usda@,
        @usdLux/schema.usda@,
    ]
)

def "GLOBAL" (
    customData = {
        string libraryName      = "usdRi"
        string libraryPath      = "pxr/usd/usdRi"
        # string libraryPrefix  = "UsdRi"
        # string tokensPrefix   = "UsdRi"
        # dictionary libraryTokens = {}
        dictionary libraryTokens = {
            dictionary spline = {
                string doc = "UsdSplineAPI - Namespace for spline attributes"
            }
            dictionary interpolation = {
                string doc = "UsdSplineAPI - Interpolation attribute name"
            }
            dictionary positions = {
                string doc = "UsdSplineAPI - Positions attribute name"
            }
            dictionary values = {
                string doc = "UsdSplineAPI - values attribute name"
            }
            dictionary linear = {
                string doc = "UsdSplineAPI - Linear spline interpolation"
            }
            dictionary bspline = {
                string doc = "UsdSplineAPI - BSpline spline interpolation"
            }
            dictionary "catmull_rom" = {
                string value = "catmull-rom"
                string doc = "UsdSplineAPI - Catmull-Rom spline interpolation"
            }
            dictionary constant = {
                string doc = "UsdSplineAPI - Constant-value spline interpolation"
            }
        }
    }
)
{
}

class "StatementsAPI" (
    inherits = </APISchemaBase>
    doc = """Container namespace schema for all renderman statements.

    \\note The longer term goal is for clients to go directly to primvar
    or render-attribute API's, instead of using UsdRi StatementsAPI
    for inherited attributes.  Anticpating this, StatementsAPI
    can smooth the way via a few environment variables:

    * USDRI_STATEMENTS_WRITE_NEW_ENCODING: Causes StatementsAPI to write
      attributes to primvars in the "ri:" namespace.
    * USDRI_STATEMENTS_READ_OLD_ENCODING: Causes StatementsAPI to read
      old-style attributes instead of primvars in the "ri:"
      namespace.
    """ 
    customData = {
        string extraIncludes = """
#include "pxr/usd/usdGeom/primvarsAPI.h"
"""
    }
) {
}

##### RSL #####

class RslShader "RslShader" (
    inherits = [</Shader>]
    doc = """
    \\deprecated RSL shaders have been deprecated in RenderMan.  This
    schema will be removed in a future release.
    """
) {
    asset info:sloPath (
        customData = {
            string apiName = "sloPath"
        }
    )
}

##### RIS #####

class RisObject "RisObject" (
    inherits = [</Shader>]
    doc = """
    \\deprecated Specialized RIS shader schemas have been deprecated in 
    favor of all shader prims being simple UsdShadeShader.
    This schema will be removed in a future release.

    Represents a ris object with connectable parameters. """ 
) {
    asset info:filePath (
        customData = { 
            string apiName = "filePath"
        }
    )
    asset info:argsPath (
        customData = {
            string apiName = "argsPath"
        }
    )
}

class RisPattern "RisPattern" (
    inherits = [</RisObject>]
    doc = """
    \\deprecated Specialized RIS shader schemas have been deprecated in 
    favor of all shader prims being simple UsdShadeShader.
    This schema will be removed in a future release.

    Represents a ris pattern object. Multiple of these can be assigned.""" 
) {
}

class RisOslPattern "RisOslPattern" (
    inherits = [</RisPattern>]
    doc = """
    \\deprecated Specialized RIS shader schemas have been deprecated in 
    favor of all shader prims being simple UsdShadeShader.
    This schema will be removed in a future release.

    Represents a ris osl pattern object.""" 
) {
    asset info:filePath = @PxrOSL@ (
        hidden = true
        customData = {
            string apiName = "filePath"
        }
    )
    asset info:oslPath (
        customData = {
            string apiName = "oslPath"
        }
    )
}

class RisBxdf "RisBxdf" (
    inherits = [</RisObject>]
    doc = """
    \\deprecated Specialized RIS shader schemas have been deprecated in 
    favor of all shader prims being simple UsdShadeShader.
    This schema will be removed in a future release.

    Represents a ris bxdf object. One of these is assigned at one time.
    """ 
) {
}

class RisIntegrator "RisIntegrator" (
    inherits = </Typed>
    doc = """
    \\deprecated RIS integrator settings will be replaced
    with a new schema in a future release.

    Integrator. Only one can be declared in a rib scene."""
) {
    asset filePath
    asset argsPath
}

### Material API common to both RSL and RIS ###

class "RiMaterialAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated Materials should use UsdShadeMaterial instead.
    This schema will be removed in a future release.

    This API provides outputs that connect a material prim to prman 
    shaders and RIS objects."""
    customData = {
        # We want the class name to be UsdRiMaterialAPI
        string className = "MaterialAPI"    
        string extraIncludes = """
#include "pxr/usd/usdShade/input.h"
#include "pxr/usd/usdShade/output.h"
#include "pxr/usd/usdShade/material.h"
"""
    }
) {
    token outputs:ri:surface (
        displayGroup = "Outputs"
        customData = {
            string apiName = "surface"
        }
    )
    token outputs:ri:displacement (
        displayGroup = "Outputs"
        customData = {
            string apiName = "displacement"
        }
    )
    token outputs:ri:volume (
        displayGroup = "Outputs"
        customData = {
            string apiName = "volume"
        }
    )
}


########################################################################
# Lighting API

class "RiLightAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated RenderMan-specific light settings will move to a
    new schema in a future release.

    RiLightAPI is an API schema that provides an interface
    to add Renderman-specific attributes to lights."""
    customData = {
        string className = "LightAPI"
    }
) {
    int ri:sampling:fixedSampleCount (
        displayGroup = "Advanced"
        displayName = "Light Samples"
        doc = """Specifies an override of the number of light samples to be
        taken for this light source. If set to something other than zero,
        it will override the sampling performed by the integrator and can 
        result in a performance impact. For scenes that have lots of lights,
        resulting in some lights that are under-sampled, you may want to set
        it to non-zero."""
    )
    float ri:sampling:importanceMultiplier = 1 (
        displayGroup = "Advanced"
        displayName = "Importance Multiplier"
        doc = "Importance of this light for noise control."
    )
    float ri:intensityNearDist (
        displayGroup = "Refine"
        displayName = "Intensity Near Dist"
        doc = """Near distance between the point being illuminated and the
        light at which the sample doesn't get brighter. This may help you
        avoid hot spots and sampling issues where a light is near a
        surface."""
    )
    string ri:lightGroup (
        displayGroup = "Advanced"
        displayName = "Light Group"
        doc = """Specify the light group name used for light group LPEs.
        This is useful to generate per-light AOVs for later adjustment
        in compositing."""
    )
    bool ri:shadow:thinShadow (
        displayGroup = "Advanced"
        displayName = "Thin Shadow"
        doc = """Enable thin shadow and disable refraction caustics for this
        light. This parameter will ignored if Trace Light Paths is
        enabled. This is a non-physical control that creates "fake"
        colored shadows for transmissive objects without needing to
        generate photons for caustics."""
    )
    bool ri:trace:lightPaths (
        displayGroup = "Advanced"
        displayName = "Trace Light Paths"
        doc = """Enable light and photon tracing from this light. This
        value enforces a physically-based light and as a side-effect
        disables the above Shadows controls. Users may use this feature
        to selectively decide which lights emit photons when using the
        PxrVCM or PxrUPBP Integrators."""
    )
}

class "RiLightFilterAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated RenderMan-specific light filter settings will move to a
    new schema in a future release.

    Renderman-specific attributes for light filters."""
    customData = {
        string className = "LightFilterAPI"
    }
)
{
    token ri:combineMode = "multiply" (
        allowedTokens = ["multiply", "max", "min", "screen"]
        doc = """Specifies how this filter combines with others.
        Valid values are:

        - multiply: The results of filters are multiplied together
        - max: The maximum result of the filters is used.  This
          works best for grey-scale filters.
        - min: The minimum result of the filters is used. This
          works best for grey-scale filters.
        - screen: Similar to max, but combines gradients in a smoother
          way by using a screen operation:
          <pre>screen(a,b) = 1-(1-a)(1-b)</pre>
          This works best for grey-scale filters.

        Light filters on a light are grouped by their combine mode.
        Each group is executed and combined using that mode.  Then,
        the final results of each group are multiplied together.

        Fallback: multiply
        """
    )
    float ri:density = 1 (
        doc = """Scales the strength of the filter."""
    )
    bool ri:invert = False (
        doc = """When true, inverts the output of the light filter."""
    )
    float ri:intensity = 0 (
        doc = """Multipier for the diffuse and specular result."""
    )
    float ri:exposure = 0 (
        doc = """Exposure control for the multiplier."""
    )
    float ri:diffuse = 1 (
        doc = """A multiplier for the effect of this light on the diffuse
        response of materials.  This is a non-physical control."""
    )
    float ri:specular = 1 (
        doc = """A multiplier for the effect of this light on the specular
        response of materials.  This is a non-physical control."""
    )
}

class "RiLightPortalAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated RenderMan-specific light portal settings will move to a
    new schema in a future release.

    Renderman-specific attributes for light portals."""
    customData = {
        string className = "LightPortalAPI"
    }
)
{
    float ri:portal:intensity (
        displayGroup = "Basic"
        doc = """Intensity adjustment relative to the light intensity.
        This gets multiplied by the light's intensity and power"""
    )
    color3f ri:portal:tint (
        displayGroup = "Basic"
        displayName = "Color Tint"
        doc = "tint: This parameter tints the color from the dome texture."
    )
}

class "RiSplineAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated This API schema will be removed in a future release.

    RiSplineAPI is a general purpose API schema used to describe
    a named spline stored as a set of attributes on a prim.
    
    It is an add-on schema that can be applied many times to a prim with
    different spline names. All the attributes authored by the schema
    are namespaced under "$NAME:spline:", with the name of the
    spline providing a namespace for the attributes.

    The spline describes a 2D piecewise cubic curve with a position and
    value for each knot. This is chosen to give straightforward artistic
    control over the shape. The supported basis types are:

    - linear (UsdRiTokens->linear)
    - bspline (UsdRiTokens->bspline)
    - Catmull-Rom (UsdRiTokens->catmull_rom)
    """
    customData = {
        string className = "SplineAPI"
    }
) {
}

class "RiTextureAPI" (
    inherits = </APISchemaBase>
    doc = """
    \\deprecated This API schema will be removed in a future release.

    RiTextureAPI is an API schema that provides an interface
    to add Renderman-specific attributes to adjust textures."""
    customData = {
        string className = "TextureAPI"
    }
) {
    float ri:texture:gamma (
        doc = """Gamma-correct the texture"""
    )
    float ri:texture:saturation (
        doc = """Adjust the texture's saturation"""
    )
}

#########################################################################
# Lights

class PxrEnvDayLight "PxrEnvDayLight" (
    inherits = </Light>
    doc = """\\deprecated This schema will be replaced in a future release."""
)
{
    int day = 1 (
        displayGroup = "MsApprox"
        displayName = "Day"
        doc = """day: Day of the month, 1 through 31.
        This is ignored if month is 0."""
    )
    float haziness = 2 (
        displayGroup = "MsApprox"
        displayName = "Haziness"
        doc = """haziness: The turbidity of the sky.  The lower limit of the
        model is 1.7 for  an exceptionally clear sky, and 10, for an
        nversion, is the upper  limit."""
    )
    float hour = 14.633333 (
        displayGroup = "MsApprox"
        displayName = "Hour"
        doc = """hour: Hours since midnight, local standard time.  May be
        fractional to include minutes and seconds.  If daylight saving time
        is in effect, subtract 1 to correct to standard time.  This is
        ignored if month is 0."""
    )
    float latitude = 47.602 (
        displayGroup = "MsApprox"
        displayName = "Latitude"
        doc = """latitude: Latitude in degrees.  Positive for north, negative
        for south.  Ranges frmo -90 to +90 degrees. This is ignored if
        month is 0."""
    )
    float longitude = -122.332 (
        displayGroup = "MsApprox"
        displayName = "Longitude"
        doc = """longitude: Longitude in degrees.  Positive for east, negative
        for west.  Ranges frmo -180 to +180 degrees.    This is ignored
        if month is 0."""
    )
    int month = 0 (
        displayGroup = "MsApprox"
        displayName = "Month"
        doc = """month: Month of the year, 1 through 12.      The default,
        0, means to use the explicitly given sun direction   instead of
        automatically computing it."""
    )
    color3f skyTint = (1, 1, 1) (
        displayGroup = "MsApprox"
        displayName = "Sky Tint"
        doc = """skyTint: Tweak the sky's contribution and color.  The
        default, white (1,1,1),  gives results based on measured
        physical values."""
    )
    vector3f sunDirection = (0, 0, 1) (
        displayGroup = "MsApprox"
        displayName = "Direction"
        doc = """sunDirection: The *apparent* direction towards the center
        of the sun. The zenith  is at +Y (for noon light) and the horizon
        is in the XZ plane (for  sunrise/set).  Note that the Y component
        must non- negative.  Ignored if a month is given."""
    )
    float sunSize = 1 (
        displayGroup = "MsApprox"
        displayName = "Sun Size"
        doc = """sunSize: Scale the apparent size of the sun in the sky.
        Leave at 1 for a  realistic sun size with an 0.55 degree
        angular diameter."""
    )
    color3f sunTint = (1, 1, 1) (
        displayGroup = "MsApprox"
        displayName = "Sun Tint"
        doc = """sunTint: Tweak the sun's contribution and color.  The
        default, white (1,1,1),  gives results based on measured
        physical values. Setting this to black removes the sun
        contribution."""
    )
    int year = 2015 (
        displayGroup = "MsApprox"
        displayName = "Year"
        doc = "year: Four-digit year.    This is ignored if month is 0."
    )
    float zone = -8 (
        displayGroup = "MsApprox"
        displayName = "Time Zone"
        doc = """zone: Standard time zone offset from GMT/UTC in hours.
        Positive for east,  negative for west.  For example, this would
        be -8 for Pacific time.    This is ignored if month is 0."""
    )
}

class PxrAovLight "PxrAovLight" (
    inherits = </Light>
    doc = """\\deprecated This schema will be replaced in a future release."""
)
{
    string aovName = "" (
        displayGroup = "Advanced"
        displayName = "AOV Name"
        doc = "The name of the AOV to write to."
    )
    bool inPrimaryHit = True (
        displayGroup = "Refine"
        displayName = "In Primvary Hit"
        doc = """If this is on, the usual mask of the illuminated objects
        is generated. If this is off, you can get a mask of only in the
        refraction or reflection."""
    )
    bool inReflection = False (
        displayGroup = "Refine"
        displayName = "In Reflection"
        doc = """If this is on, the rays are traced through the specular
        reflections to get  the masking signal.  Warning: this will
        require some amount of samples to get a clean mask."""
    )
    bool inRefraction = False (
        displayGroup = "Refine"
        displayName = "In Refraction"
        doc = """If this is on, the rays are traced through the glass
        refractions  to get the masking signal.  Warning: this will
        require some amount of samples to get a clean mask."""
    )
    bool invert = False (
        displayGroup = "Refine"
        displayName = "Invert"
        doc = "If this is on, it inverts the signal for the AOV."
    )
    bool onVolumeBoundaries = True (
        displayGroup = "Refine"
        displayName = "On Volume Boundaries"
        doc = """If this is on, the bounding box or shape of volumes will
        appear in the mask. Since this is not always desirable, this can
        be turned off."""
    )
    bool useColor = False (
        displayGroup = "Refine"
        displayName = "Use Color"
        doc = """If this is on, it outputs a RGB color image instead of a
        float image for the AOV."""
    )
    bool useThroughput = True (
        displayGroup = "Refine"
        displayName = "Use Throughput"
        doc = """If this is on, the values in the mask for the reflected
        or refracted rays will be affected by the strength of the reflection
        or refraction. This can lead to values below and above 1.0. Turn
        this off if you want a more solid mask."""
    )
}

#########################################################################
# Light filters

class PxrIntMultLightFilter "PxrIntMultLightFilter" (
    inherits = </LightFilter>
    doc = """
    \\deprecated This schema will be replaced in a future release.
    Multiplies the intensity of a given light.
    """
) {
    # override the class defn in RiLightFilterAPI because the class default is 0.0
    float ri:intensity = 1 (
        doc = """Multipier for the light intensity.
	This setting is meant to override the fallback value in RiLightFilterAPI"""
    )
    float color:saturation = 1 (
        doc = """Saturation of the light before hitting the surface (0=greyscale,1=normal,
	>1=boosted colors)."""
    )
}

class PxrBarnLightFilter "PxrBarnLightFilter" (
    inherits = </LightFilter>
    doc = """
    \\deprecated This schema will be replaced in a future release.
    Simulated geometric barn doors that control the spread of light.
    """
) {
    token barnMode = "physical" (
        allowedTokens = ["physical", "analytic"]
        doc = """Chooses a physical or analytic evaluation model for
        the barn."""
    )
    float width = 1 (
        doc = """Width of the inner region of the barn (X axis)."""
    )
    float height = 1 (
        doc = """Height of the inner region of the barn (Y axis)."""
    )
    float radius = 0.5 (
        doc = """Radius of the corners of the inner barn square."""
    )
    bool analytic:directional = false (
        doc = """When this is on, the texture projects along a direction
        using the orthographic projection. When it is off, the texture
        projects using a focal point specified by the analytic:apex."""
    )
    float analytic:shearX = 0 (
        doc = """Shear the projection along the X axis."""
    )
    float analytic:shearY = 0 (
        doc = """Shear the projection along the Y axis."""
    )
    float analytic:apex = 25 (
        doc = """Shear the projection along the Y axis."""
    )
    bool analytic:useLightDirection = false (
        doc = """When this is on, If this is on, the projection direction
        is determined by the position of the center of the light source.
        Otherwise, it only follows the orientation of the barn. WARNING:
        This does not work with dome and mesh lights."""
    )
    float analytic:density:nearDistance = 0 (
        doc = """Distance from the barn where the density
        interpolation starts."""
    )
    float analytic:density:farDistance = 0 (
        doc = """Distance from the barn where the density interpolation
        ends."""
    )
    float analytic:density:nearValue = 0 (
        doc = """Density multiplier where the density interpolation starts."""
    )
    float analytic:density:farValue = 1 (
        doc = """Density multiplier at the end of interpolation."""
    )
    float analytic:density:exponent = 1 (
        doc = """Power exponent of the density interpolation."""
    )
    float edgeThickness = 0 (
        doc = """Thickness of the edge region.  Larger values will
        soften the edge shape."""
    )
    token preBarnEffect = "noLight" (
        allowedTokens = ["noEffect", "cone", "noLight"]
        doc = """The effect on light before it reaches the barn
        geometry."""
    )
    float scale:width = 1 (
        doc = """Scale the width of the inner barn shape."""
    )
    float scale:height = 1 (
        doc = """Scale the height of the inner barn shape."""
    )
    float refine:top = 0 (
        doc = """Additional offset adjustment to the top region."""
    )
    float refine:bottom = 0 (
        doc = """Additional offset adjustment to the top region."""
    )
    float refine:left = 0 (
        doc = """Additional offset adjustment to the left region."""
    )
    float refine:right = 0 (
        doc = """Additional offset adjustment to the left region."""
    )
    float edgeScale:top = 1 (
        doc = """Additional edge scale adjustment to the top region."""
    )
    float edgeScale:bottom = 1 (
        doc = """Additional edge scale adjustment to the top region."""
    )
    float edgeScale:left = 1 (
        doc = """Additional edge scale adjustment to the left region."""
    )
    float edgeScale:right = 1 (
        doc = """Additional edge scale adjustment to the left region."""
    )
}

class PxrCookieLightFilter "PxrCookieLightFilter" (
    inherits = </LightFilter>
    doc = """
    \\deprecated This schema will be replaced in a future release.
    A textured surface that filters light.
    """
) {
    token cookieMode = "physical" (
        allowedTokens = ["physical", "analytic"]
        doc = """Chooses a physical or analytic evaluation model for
        the cookie:
        - physical: The cookie behaves like a stained glass window
          through which light falls. The falloff and blur are determined
          by the size of the light, the distance to the light and distance
          from the cookie.
        - analytic: The cookie has a fixed projection and manual blur
          and falloff controls.
        """
    )
    float width = 1 (
        doc = """Width of the rect the light is shining through."""
    )
    float height = 1 (
        doc = """Height of the rect the light is shining through."""
    )
    asset texture:map (
        doc = """A color texture to use on the cookie.  May use alpha."""
    )
    token texture:wrapMode = "off" (
        allowedTokens = ["off", "repeat", "clamp"]
        doc = """Specifies what value to use outside the texture's domain:
        - off: no repeat
        - repeat: repeats in X and Y
        - clamp: uses the value from the nearest edge
        """
    )
    color3f texture:fillColor = (1, 1, 1) (
        doc = """If the texture is not repeating, this specifies the
        color for the region outside of and behind the projected rectangle."""
    )
    bool texture:premultipliedAlpha = true (
	doc = """Textures are usually premultiplied by their alpha. If this not
	the case, uncheck this."""
    )
    bool texture:invertU = false (
        doc = """Flips the texture from left to right. By default, the
        orientation of the texture as seen from the light source matches
        the orientation as it is viewed in an image viewer."""
    )
    bool texture:invertV = false (
        doc = """Flips the texture from top to bottom. By default, the
        orientation of the texture as seen from the light source matches
        the orientation as it is viewed in an image viewer."""
    )
    float texture:scaleU = 1 (
        doc = """Scales the U dimension."""
    )
    float texture:scaleV = 1 (
        doc = """Scales the V dimension."""
    )
    float texture:offsetU = 0 (
        doc = """Offsets the texture in the U direction."""
    )
    float texture:offsetV = 0 (
        doc = """Offsets the texture in the V direction."""
    )

    bool analytic:directional = false (
        doc = """When this is on, the texture projects along a direction
        using the orthographic projection. When it is off, the texture
        projects using a focal point specified by the analytic:apex."""
    )
    float analytic:shearX = 0 (
        doc = """Shear the projection along the X axis."""
    )
    float analytic:shearY = 0 (
        doc = """Shear the projection along the Y axis."""
    )
    float analytic:apex = 25 (
        doc = """Distance between the center of cookie and the center of projection."""
    )
    bool analytic:useLightDirection = false (
        doc = """When this is on, If this is on, the projection direction
        is determined by the position of the center of the light source.
        Otherwise, it only follows the orientation of the filter. WARNING:
        This does not work with dome and mesh lights."""
    )
    float analytic:blur:amount = 0 (
        doc = """Specify the blur of projected texture from 0-1. This
        gets multiplied by the blurNear/blurFar interpolation. This
        blurs between the projected color and the fill color when the
        texture is not repeating."""
    )
    float analytic:blur:sMult = 0 (
        doc = """Blur multiplier in the S direction."""
    )
    float analytic:blur:tMult = 0 (
        doc = """Blur multiplier in the T direction."""
    )
    float analytic:blur:nearDistance = 0.0 (
        doc = """Distance from the cookie where the blur interpolation
        starts."""
    )
    float analytic:blur:midpoint = 0.5 (
        doc = """Distance between near and far where midValue is located."""
    )
    float analytic:blur:farDistance = 10.0 (
        doc = """Distance from the cookie where the blur interpolation ends."""
    )
    float analytic:blur:nearValue = 1 (
        doc = """Blur multiplier where the blur interpolation starts."""
    )
    float analytic:blur:midValue = 1 (
        doc = """Blur multiplier in the middle of interpolation."""
    )
    float analytic:blur:farValue = 1 (
        doc = """Blur multiplier at the end of interpolation."""
    )
    float analytic:blur:exponent = 1 (
        doc = """Power exponent of the blur interpolation."""
    )


    float analytic:density:nearDistance = 0.0 (
        doc = """Distance from the cookie where the density
        interpolation starts."""
    )
    float analytic:density:midpoint = 0.5 (
        doc = """Distance between near and far where midValue is located."""
    )
    float analytic:density:farDistance = 10.0 (
        doc = """Distance from the cookie where the density interpolation
        ends."""
    )
    float analytic:density:nearValue = 1 (
        doc = """Density multiplier where the density interpolation starts."""
    )
    float analytic:density:midValue = 1 (
        doc = """Density multiplier in the middle of interpolation."""
    )
    float analytic:density:farValue = 1 (
        doc = """Density multiplier at the end of interpolation."""
    )
    float analytic:density:exponent = 1 (
        doc = """Power exponent of the density interpolation."""
    )

    float color:saturation = 1 (
        doc = """Saturation of the result (0=greyscale, 1=normal,
        >1=boosted colors)."""
    )
    float color:midpoint = 0.18 (
        doc = """Midpoint for the contrast control."""
    )
    float color:contrast = 1 (
        doc = """Contrast control (less than 1 = contrast reduction,
        larger than 1 = contrast increase)."""
    )
    float color:whitepoint = 1 (
        doc = """White point for the contrast control if (contrast > 1.0)."""
    )
    color3f color:tint = (1, 1, 1)  (
        doc = """Tint of the resulting color after saturation, contrast
        and clamp."""
    )
}

class PxrRampLightFilter "PxrRampLightFilter" (
    inherits = </LightFilter>
    doc = """
    \\deprecated This schema will be replaced in a future release.
    A ramp to modulate how a light falls off with distance.
    """
    customData = {
        string extraIncludes = """
#include "pxr/usd/usdRi/splineAPI.h"
"""
    }
) {
    token rampMode = "distanceToLight" (
        allowedTokens = ["distanceToLight", "linear", "spherical", "radial"]
        doc = """Specifies the direction in which the ramp is applied"""
    )
    # distances apply to both the falloff and color ramps
    float beginDistance = 0 (
	doc = """Distance where the ramp starts."""
    )
    float endDistance = 10 (
	doc = """Distance where the ramp ends."""
    )
    # this is called ramp in the args file and code
    int falloff = 4 (
        doc = """Controls the transition from the core to the edge."""
    )
    float[] falloff:knots = [0, 0, 1, 1] (
        doc = """Knots of the falloff spline."""
    )
    float[] falloff:floats = [0, 0, 1, 1] (
        doc = """Float values of the falloff spline."""
    )
    token falloff:interpolation = "linear" (
        allowedTokens = ["linear", "catmull-rom", "bspline", "constant"]
        doc = """Falloff spline type. """
    )
    int colorRamp = 4 (
        doc = """Controls the color gradient for the transition."""
    )
    float[] colorRamp:knots = [0, 0, 1, 1] (
        doc = """Knots of the colorRamp spline."""
    )
    color3f[] colorRamp:colors = [(1, 1, 1), (1, 1, 1), (1, 1, 1), (1, 1, 1)] (
        doc = """Color values of the colorRamp spline."""
    )
    token colorRamp:interpolation = "linear" (
        allowedTokens = ["linear", "catmull-rom", "bspline", "constant"]
        doc = """ColorRamp spline type. """
    )
}

class PxrRodLightFilter "PxrRodLightFilter" (
    inherits = </LightFilter>
    doc = """
    \\deprecated This schema will be replaced in a future release.
    Simulates a rod or capsule-shaped region to modulate light.
    """
    customData = {
        string extraIncludes = """
#include "pxr/usd/usdRi/splineAPI.h"
"""
    }
) {
    float width = 0 (
        doc = """Width of the inner region of the rod (X axis)."""
    )
    float height = 0 (
        doc = """Height of the inner region of the rod (Y axis)."""
    )
    float depth = 0 (
        doc = """Depth of the inner region of the rod (Z axis)."""
    )
    float radius = 1 (
        doc = """Radius of the corners of the inner rod box."""
    )
    float edgeThickness = 0.25 (
        doc = """Thickness of the edge region.  Larger values will
        soften the edge shape."""
    )
    float scale:width = 1 (
        doc = """Scale the width of the inner rod shape."""
    )
    float scale:height = 1 (
        doc = """Scale the height of the inner rod shape."""
    )
    float scale:depth = 1 (
        doc = """Scale the depth of the inner rod shape."""
    )

    float refine:top = 0 (
        doc = """Additional offset adjustment to the top region."""
    )
    float refine:bottom = 0 (
        doc = """Additional offset adjustment to the top region."""
    )
    float refine:left = 0 (
        doc = """Additional offset adjustment to the left region."""
    )
    float refine:right = 0 (
        doc = """Additional offset adjustment to the left region."""
    )
    float refine:front = 0 (
        doc = """Additional offset adjustment to the front region."""
    )
    float refine:back = 0 (
        doc = """Additional offset adjustment to the back region."""
    )

    float edgeScale:top = 1 (
        doc = """Additional edge scale adjustment to the top region."""
    )
    float edgeScale:bottom = 1 (
        doc = """Additional edge scale adjustment to the top region."""
    )
    float edgeScale:left = 1 (
        doc = """Additional edge scale adjustment to the left region."""
    )
    float edgeScale:right = 1 (
        doc = """Additional edge scale adjustment to the left region."""
    )
    float edgeScale:front = 1 (
        doc = """Additional edge scale adjustment to the front region."""
    )
    float edgeScale:back = 1 (
        doc = """Additional edge scale adjustment to the back region."""
    )

    float color:saturation = 1 (
        doc = """Saturation of the result (0=greyscale, 1=normal,
        >1=boosted colors)."""
    )

    int falloff = 6 (
        doc = """Controls the transition from the core to the edge."""
    )
    float[] falloff:knots = [0, 0, 0.3, 0.7, 1, 1] (
        doc = """Knots of the falloff spline."""
    )
    float[] falloff:floats = [0, 0, 0.2, 0.8, 1, 1] (
        doc = """Float values of the falloff spline."""
    )
    token falloff:interpolation = "bspline" (
        allowedTokens = ["linear", "catmull-rom", "bspline", "constant"]
        doc = """Falloff spline type. """
    )

    int colorRamp = 4 (
        doc = """Controls the color gradient for the transition."""
    )
    float[] colorRamp:knots = [0, 0, 1, 1] (
        doc = """Knots of the colorRamp spline."""
    )
    color3f[] colorRamp:colors = [(1, 1, 1), (1, 1, 1), (1, 1, 1), (1, 1, 1)] (
        doc = """Color values of the colorRamp spline."""
    )
    token colorRamp:interpolation = "linear" (
        allowedTokens = ["linear", "catmull-rom", "bspline", "constant"]
        doc = """ColorRamp spline type. """
    )
}