ToParts.osl

/*
 *  Copyright 2023 Laika, LLC. Authored by Mitch Prater.
 *
 *  Licensed under the Apache License Version 2.0 http://apache.org/licenses/LICENSE-2.0,
 *  or the MIT license http://opensource.org/licenses/MIT, at your option.
 *
 *  This program may not be copied, modified, or distributed except according to those terms.
 */
#include "LaD.h"

shader LaD_ToParts
[[
    int rfm_nodeid = 1234263,
    string rfm_classification = "rendernode/RenderMan/pattern/Laika"
]]
(
    string Notes = ""
    [[
        int connectable = 0,
        string help =
            "Convert a LaSh Displacement (LaD) struct into its component parts: "
            "<p>"
            "<b>Mask</b>: the displacement mask. "
            "<br/><b>Thickness</b> "
            "<br/><b>Accumulation</b> "
            "<br/><b>TauScale</b>: the optical density scale. "
            "<br/><b>Nd</b>: the displaced surface normal. "
            "<br/><b>DeltaP</b>: the vector displacement. "
            "<br/><b>Bulk</b>: the displacement's accumulation bulk. "
            "<p/>"
    ]],

    float CascadeNormal = 1.0
    [[
        string label = "Cascade Normal",
        int slider = 1, float slidermin = 0.0, float slidermax = 1.0,
        string help =
            "Pass-through the input <b>LaD</b>'s normal (1), "
            "or replace it with the original surface normal (0). "
    ]],

    LaD_struct  LaD = LaD_INIT
    [[
        string readOnly = "True",
        string help =
            "A LaSh Displacement (LaD). "
    ]],

    output float  Mask = 1.0,
    output float  Thickness = 0.0,
    output float  Accumulation = 0.0,
    output float  TauScale = 1.0,
    output normal Nd = N,
    output vector DeltaP = vector(0.0),
    output float  Bulk = 0.0
)
{
    Mask = LaD.Mask;
    Thickness = LaD.Thickness;
    Accumulation = LaD.Accumulation;
    TauScale = LaD.TauScale;
    Nd = normalize( mix( N, LaD.Nd, CascadeNormal ));
    DeltaP = LaD.DeltaP;
    Bulk = LaD.Bulk;
}