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workflows/simbox/example_assets/table0/Materials/OmniUe4Base.mdl
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workflows/simbox/example_assets/table0/Materials/OmniUe4Base.mdl
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/***************************************************************************************************
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* Copyright 2020 NVIDIA Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**************************************************************************************************/
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//* 1.0.0 - first version
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//* 1.0.1 - merge unlit template
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//* 1.0.2 - Fix EDF in the back side: the EDF contained in surface is only used for the front side and not for the back side
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//* 1.0.3 - UE4 normal mapping: Geometry normal shouldn't be changed
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//* 1.0.4 - using absolute import paths when importing standard modules
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mdl 1.3;
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import ::df::*;
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import ::state::*;
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import ::math::*;
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import ::tex::*;
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import ::anno::*;
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float emissive_multiplier()
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[[
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anno::description("the multiplier to convert UE4 emissive to raw data"),
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anno::noinline()
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]]
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{
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return 20.0f * 128.0f;
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}
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float3 tangent_space_normal(
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float3 normal = float3(0.0,0.0,1.0),
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float3 tangent_u = state::texture_tangent_u(0),
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float3 tangent_v = state::texture_tangent_v(0)
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)
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[[
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anno::description("Interprets the vector in tangent space"),
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anno::noinline()
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]]
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{
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return math::normalize(
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tangent_u * normal.x - /* flip_tangent_v */
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tangent_v * normal.y +
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state::normal() * (normal.z));
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}
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float3 world_space_normal(
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float3 normal = float3(0.0,0.0,1.0),
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float3 tangent_u = state::texture_tangent_u(0),
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float3 tangent_v = state::texture_tangent_v(0)
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)
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[[
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anno::description("Interprets the vector in world space"),
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anno::noinline()
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]]
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{
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return tangent_space_normal(
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math::normalize(
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normal.x * float3(tangent_u.x, tangent_v.x, state::normal().x) -
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normal.y * float3(tangent_u.y, tangent_v.y, state::normal().y) +
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normal.z * float3(tangent_u.z, tangent_v.z, state::normal().z)),
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tangent_u,
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tangent_v
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);
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}
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export material OmniUe4Base(
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float3 base_color = float3(0.0, 0.0, 0.0),
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float metallic = 0.0,
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float roughness = 0.5,
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float specular = 0.5,
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float3 normal = float3(0.0,0.0,1.0),
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float clearcoat_weight = 0.0,
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float clearcoat_roughness = 0.0,
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float3 clearcoat_normal = float3(0.0,0.0,1.0),
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uniform bool enable_opacity = true,
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float opacity = 1.0,
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float3 emissive_color = float3(0.0, 0.0, 0.0),
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float3 displacement = float3(0.0),
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uniform bool is_tangent_space_normal = true,
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uniform bool two_sided = false,
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uniform bool is_unlit = false
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)
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[[
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anno::display_name("Omni UE4 Base"),
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anno::description("Omni UE4 Base, supports UE4 default lit and clearcoat shading model"),
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anno::version( 1, 0, 0),
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anno::author("NVIDIA CORPORATION"),
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anno::key_words(string[]("omni", "UE4", "omniverse", "lit", "clearcoat", "generic"))
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]]
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= let {
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color final_base_color = math::saturate(base_color);
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float final_metallic = math::saturate(metallic);
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float final_roughness = math::saturate(roughness);
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float final_specular = math::saturate(specular);
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color final_emissive_color = math::max(emissive_color, 0.0f) * emissive_multiplier(); /*factor for converting ue4 emissive to raw value*/
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float final_clearcoat_weight = math::saturate(clearcoat_weight);
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float final_clearcoat_roughness = math::saturate(clearcoat_roughness);
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float3 final_normal = math::normalize(normal);
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float3 final_clearcoat_normal = math::normalize(clearcoat_normal);
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// - compute final roughness by squaring the "roughness" parameter
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float alpha = final_roughness * final_roughness;
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// reduce the reflectivity at grazing angles to avoid "dark edges" for high roughness due to the layering
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float grazing_refl = math::max((1.0 - final_roughness), 0.0);
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float3 the_normal = is_unlit ? state::normal() :
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(is_tangent_space_normal ?
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tangent_space_normal(
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normal: final_normal,
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tangent_u: state::texture_tangent_u(0),
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tangent_v: state::texture_tangent_v(0)
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) : world_space_normal(
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normal: final_normal,
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tangent_u: state::texture_tangent_u(0),
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tangent_v: state::texture_tangent_v(0)
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));
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// for the dielectric component we layer the glossy component on top of the diffuse one,
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// the glossy layer has no color tint
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bsdf dielectric_component = df::custom_curve_layer(
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weight: final_specular,
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normal_reflectivity: 0.08,
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grazing_reflectivity: grazing_refl,
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layer: df::microfacet_ggx_smith_bsdf(roughness_u: alpha),
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base: df::diffuse_reflection_bsdf(tint: final_base_color),
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normal: the_normal);
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// the metallic component doesn't have a diffuse component, it's only glossy
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// base_color is applied to tint it
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bsdf metallic_component = df::microfacet_ggx_smith_bsdf(tint: final_base_color, roughness_u: alpha);
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// final BSDF is a linear blend between dielectric and metallic component
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bsdf dielectric_metal_mix =
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df::normalized_mix(
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components:
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df::bsdf_component[](
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df::bsdf_component(
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component: metallic_component,
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weight: final_metallic),
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df::bsdf_component(
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component: dielectric_component,
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weight: 1.0-final_metallic)
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)
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);
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// clearcoat layer
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float clearcoat_grazing_refl = math::max((1.0 - final_clearcoat_roughness), 0.0);
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float clearcoat_alpha = final_clearcoat_roughness * final_clearcoat_roughness;
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float3 the_clearcoat_normal = is_tangent_space_normal ? tangent_space_normal(
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normal: final_clearcoat_normal,
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tangent_u: state::texture_tangent_u(0),
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tangent_v: state::texture_tangent_v(0)
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) : world_space_normal(
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normal: final_clearcoat_normal,
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tangent_u: state::texture_tangent_u(0),
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tangent_v: state::texture_tangent_v(0)
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);
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bsdf clearcoat =
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df::custom_curve_layer(
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base: df::weighted_layer(
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layer: dielectric_metal_mix,
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weight: 1.0,
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normal: final_clearcoat_weight == 0.0 ? state::normal() : the_normal
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),
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layer: df::microfacet_ggx_smith_bsdf(
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roughness_u: clearcoat_alpha,
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tint: color(1.0)
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),
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normal_reflectivity: 0.04,
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grazing_reflectivity: clearcoat_grazing_refl,
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normal: the_clearcoat_normal,
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weight: final_clearcoat_weight
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);
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bsdf surface = is_unlit ? bsdf() : clearcoat;
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}
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in material(
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thin_walled: two_sided, // Graphene?
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surface: material_surface(
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scattering: surface,
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emission:
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material_emission (
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emission: df::diffuse_edf (),
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intensity: final_emissive_color
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)
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),
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backface: material_surface(
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emission:
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material_emission (
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emission: df::diffuse_edf (),
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intensity: final_emissive_color
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)
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),
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geometry: material_geometry(
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displacement: displacement,
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normal: final_clearcoat_weight == 0.0 ? the_normal : state::normal(),
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cutout_opacity: enable_opacity ? opacity : 1.0
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)
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);
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