materials/vMaterials_2/Plastic/PCB_Prepreg.mdl

/******************************************************************************
 *			Copyright 2024 NVIDIA Corporation. All rights reserved.		   *
 ******************************************************************************

Permission is hereby granted by NVIDIA Corporation ("NVIDIA"), free of charge,
to any person obtaining a copy of the sample definition code that uses our
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subject to the following further conditions:

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that follows shall be retained in all copies of one or more of the MDL
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THE MDL MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
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*/


mdl 1.5;

import ::anno::*;
import ::base::*;
import ::df::*;
import ::math::*;
import ::state::*;
import ::tex::*;
import ::nvidia::core_definitions::blend_colors;
import ::nvidia::core_definitions::dimension;


const string COPYRIGHT =
" Copyright 2024 NVIDIA Corporation. All rights reserved.\n"
" MDL MATERIALS ARE PROVIDED PURSUANT TO AN END USER LICENSE  AGREEMENT,\n"
" WHICH WAS ACCEPTED IN ORDER TO GAIN ACCESS TO THIS FILE.  IN PARTICULAR,\n"
" THE MDL MATERIALS ARE PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n"
" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF\n"
" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF\n"
" COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL NVIDIA\n"
" CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY\n"
" GENERAL, SPECIAL,  INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN\n"
" AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR\n"
" INABILITY TO USE THE MDL MATERIALS OR FROM OTHER DEALINGS IN THE MDL MATERIALS.\n";
		
const string DESCRIPTION = "A plastic material for printed circuit boards (PCB)";

::base::texture_coordinate_info transform_coordinate_2(
	float4x4 transform										 
		[[ ::anno::description("A transformation to be applied to the source coordinates. rotation_translation_scale() is a suggested means to compute the transformation matrix.") ]],
	::base::texture_coordinate_info coordinate = ::base::texture_coordinate_info()
		[[ ::anno::description("Coordinate, typically sourced from coordinate_source or coordinate_projection.") ]]
) [[ 
	::anno::description("Transform a texture coordinate by a matrix.") ,
	::anno::noinline()
  ]]
{
	// Version 2
	float4 r_position = transform * float4(coordinate.position.x,coordinate.position.y,coordinate.position.z,1);
	//Try aproximating it for the case that the rotation is only aroud z and assuming the texture layout is nice and z is ~constant.
	//just pretend there is no other rotation happening
	//get rid of scaling and translation. Then extract fields where sin and cos would be in a simple 2d transform around z.
	float4 u = transform[0];
	float3 ru = ::math::normalize(float3(u.x,u.y,u.z));
	float cos =  ru.x; 
	float sin =  -ru.y;

	
	return ::base::texture_coordinate_info(
		float3(r_position.x,r_position.y,r_position.z),
		::math::normalize(cos * coordinate.tangent_u - sin * coordinate.tangent_v),
		::math::normalize(cos * coordinate.tangent_v + sin * coordinate.tangent_u));
}

float histogram_range(float input, float range = 1.0f, float position = 0.5f)
{	
	float low = ::math::clamp(1.0 - ::math::min(((1.0 - position) + range * 0.5), (1.0 - position) * 2), 0.0, 1.0);
	float high = ::math::clamp(::math::min((position + range * 0.5 ), position * 2.0), 0.0, 1.0);
	return ::math::lerp(low, high, input);
}

::base::texture_coordinate_info vmat_transform(
								float2 translation = float2(0.0, 0.0),
								float rotation	 = 0.0,				// rotation in degrees
								float2 scaling	 = float2(1.0, 1.0),
								uniform ::base::texture_coordinate_system system = ::base::texture_coordinate_uvw,
								uniform int uv_space	   = 0
)
{
	float rotation_rad = (rotation * 3.1415926535897932384626433832f) / 180.f;
	float4x4 scale =
	float4x4(1.0 /scaling.x, 0.			 ,  0. ,	 0.,
			 0.			, 1.0 /scaling.y ,  0. ,	 0.,
			 0.			, 0.			 ,  1.0,	 0.,
			 translation.x , translation.y  ,  0.0,	 1.);

	float s = ::math::sin(rotation_rad);
	float c = ::math::cos(rotation_rad);
	float4x4 rotate =
	float4x4(  c  ,  -s   , 0.0 , 0.0,
			   s  ,   c   , 0.0 , 0.0,
			   0.0,   0.0 , 1.0 , 0.0,
			   0. ,   0.0 , 0.0 , 1.);
	
	return transform_coordinate_2(scale*rotate, ::base::coordinate_source(system, uv_space));
}

struct volume_info
[[
	::anno::hidden()
]]
{
	color absorption_coefficient;
	color scattering_coefficient;
};

volume_info volume_transmittance_albedo(
	uniform float density_scale = 1.0,
	uniform color transmittance = color(0.5f), // transmittance color after unit distance
	uniform color albedo = color(1.0f)
)
[[
	::anno::noinline()
]]
{
	color sigma_t = -::math::log(::math::saturate(transmittance)) * density_scale;
	color sigma_s = sigma_t * ::math::saturate(albedo);
	return volume_info(
		scattering_coefficient: sigma_s,
		absorption_coefficient: sigma_t - sigma_s);
}


export material PCB_Prepreg(
	float diffuse_brightness = 1.f [[
		::anno::description("Adjusts the lightness of the material."),
		::anno::display_name("Brightness"),
		::anno::in_group("Appearance"),
		::anno::hard_range(0.f, 1.f),
		::anno::ui_order(0)
	]],
	float reflection_roughness = 0.75f [[
		::anno::description("Higher roughness values lead to bigger highlights and blurrier reflections."),
		::anno::display_name("Roughness"),
		::anno::in_group("Appearance", "Reflection"),
		::anno::hard_range(0.f, 1.f),
		::anno::ui_order(1)
	]],
	uniform float bump_strength = 1.f [[
		::anno::description("Specifies the strength of the bump."),
		::anno::display_name("Bump Strength"),
		::anno::in_group("Appearance"),
		::anno::hard_range(0.f, 1.f),
		::anno::ui_order(2)
	]],
	uniform bool subsurface_scattering = false [[
		::anno::description("Enable light that penetrates the surface of a translucent object. While set to True it\'s a physically correct calculated SSS effect. If set to False it\'s a diffuse transmission that is cheaper to perform."),
		::anno::display_name("Subsurface Scattering"),
		::anno::in_group("Advanced"),
		::anno::ui_order(3)
	]],
	uniform float translucency_amount = 0.3f [[
		::anno::description("Describes how far light passes through the material."),
		::anno::display_name("Transluceny Amount"),
		::anno::in_group("Advanced"),
		::anno::hard_range(0.f, 1.f),
		::anno::ui_order(4)
	]],
	float2 texture_translate = float2(0.f) [[
		::anno::description("Controls the position of the texture."),
		::anno::display_name("Texture Translate"),
		::anno::in_group("Transform"),
		::anno::ui_order(5)
	]],
	float texture_rotate = 0.f [[
		::anno::description("Rotates angle of the texture in degrees."),
		::anno::display_name("Texture Rotate"),
		::anno::in_group("Transform"),
		::anno::ui_order(6)
	]],
	float2 texture_scale = float2(1.f) [[
		::anno::description("Larger numbers increase the size."),
		::anno::display_name("Texture Scale"),
		::anno::in_group("Transform"),
		::nvidia::core_definitions::dimension(float2(.1f, .1f)),
		::anno::ui_order(7)
	]],
	uniform bool enable_round_corners = false [[
		::anno::description("Enables the round corner effect. Comes at a slight performance cost as additional raytracing calls are required to evaluate the round corner effect."),
		::anno::display_name("Round Corners"),
		::anno::in_group("Round Corners"),
		::anno::ui_order(8)
	]],
	uniform float radius = 1.5f [[
		::anno::description("Radius of the rounded corners in millimeters (mm)."),
		::anno::display_name("Radius mm"),
		::anno::in_group("Round Corners"),
		::anno::ui_order(9)
	]],
	uniform bool across_materials = false [[
		::anno::description("Applies the round corner effect across different materials when enabled."),
		::anno::display_name("Across Materials"),
		::anno::in_group("Round Corners"),
		::anno::ui_order(10)
	]],
	uniform bool no_uv = false [[
		::anno::description("Set this to true if your model has no UV layout."),
		::anno::display_name("No UV"),
		::anno::in_group("Advanced", "Projection"),
		::anno::ui_order(11)
	]],
	uniform ::base::texture_coordinate_system coordinate_system = ::base::texture_coordinate_object [[
		::anno::description("The projection can be done based on world or object space. Do not use uvw space. Since it is disabled while No UV is set to true."),
		::anno::display_name("Coordinate System"),
		::anno::in_group("Advanced", "Projection"),
		::anno::ui_order(12)
	]],
	uniform ::base::projection_mode projection_type = ::base::projection_planar [[
		::anno::description("Projection method to be used to generate the coordinates."),
		::anno::display_name("Projection Type"),
		::anno::in_group("Advanced", "Projection"),
		::anno::ui_order(13)
	]],
	uniform float scale = 1.f [[
		::anno::description("Scales the texture while No UV is true."),
		::anno::display_name("Scale Projection"),
		::anno::in_group("Advanced", "Projection"),
		::anno::ui_order(14)
	]],
	uniform int uv_space_index = 0 [[
		::anno::description("Use selected UV space for material."),
		::anno::display_name("UV Space Index"),
		::anno::in_group("Advanced"),
		::anno::ui_order(15)
	]])
[[
		::anno::description(DESCRIPTION),
		::anno::display_name("PCB Prepreg"),
		::anno::copyright_notice(COPYRIGHT),
		::anno::key_words(string[]("dielectric", "pcb", "computer", "plastic", "translucency", "yellow", "bright", "technical", "electronic", "plate", "construction")),
		::anno::thumbnail("./.thumbs/PCB_Prepreg.PCB_Prepreg.png"),
		::anno::author("Nvidia vMaterials"),
		::anno::contributor("Maik Rohland"),
		::anno::contributor("Ruediger Raab")
]]
 = 
	let {
		bool tmp0 = false;
		material_surface tmp1(::df::custom_curve_layer(0.0399999991f, 1.f, 5.f, 1.f, ::df::microfacet_ggx_smith_bsdf(histogram_range(float3(::base::file_texture(texture_2d("./textures/pcb_prepreg_rough.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 0.5f, ::math::lerp(0.f, 0.899999976f, reflection_roughness)) * histogram_range(float3(::base::file_texture(texture_2d("./textures/pcb_prepreg_rough.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 0.5f, ::math::lerp(0.f, 0.899999976f, reflection_roughness)), histogram_range(float3(::base::file_texture(texture_2d("./textures/pcb_prepreg_rough.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 0.5f, ::math::lerp(0.f, 0.899999976f, reflection_roughness)) * histogram_range(float3(::base::file_texture(texture_2d("./textures/pcb_prepreg_rough.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 0.5f, ::math::lerp(0.f, 0.899999976f, reflection_roughness)), color(1.f, 1.f, 1.f), ::state::texture_tangent_u(0), ::df::scatter_reflect), ::df::weighted_layer(translucency_amount * 0.5f, ::df::diffuse_transmission_bsdf(color(0.74841398f, 0.74841398f, 0.74841398f)), ::df::weighted_layer(1.f, ::df::diffuse_reflection_bsdf(nvidia::core_definitions::blend_colors(::base::file_texture(texture_2d("./textures/pcb_prepreg_diff.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint, color(0.f, 0.f, 0.f), ::base::color_layer_multiply, ::math::lerp(0.699999988f, 0.25f, diffuse_brightness)).tint, 0.484000027f), bsdf(), ::base::tangent_space_normal_texture(texture_2d("./textures/pcb_prepreg_norm.jpg", ::tex::gamma_linear), bump_strength, false, false, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false, 1.f, 0.f)), ::state::normal()), ::base::tangent_space_normal_texture(texture_2d("./textures/pcb_prepreg_norm.jpg", ::tex::gamma_linear), bump_strength, false, false, no_uv ? ::base::coordinate_projection(coordinate_system, uv_space_index, projection_type, float4x4(scale)) : vmat_transform(texture_translate, texture_rotate, texture_scale * 0.100000001f, ::base::texture_coordinate_uvw, uv_space_index), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false, 1.f, 0.f)), material_emission(emission: edf(), intensity: color(0.f, 0.f, 0.f), mode: intensity_radiant_exitance));
		material_surface tmp2 = material_surface(scattering: bsdf(), emission: material_emission(emission: edf(), intensity: color(0.f, 0.f, 0.f), mode: intensity_radiant_exitance));
		color tmp3 = color(1.f, 1.f, 1.f);
		material_volume tmp4 = subsurface_scattering ? material_volume(vdf(), volume_transmittance_albedo(translucency_amount, color(0.132868007f, 0.132868007f, 0.132868007f), color(1.f, 1.f, 1.f)).absorption_coefficient, volume_transmittance_albedo(translucency_amount, color(0.132868007f, 0.132868007f, 0.132868007f), color(1.f, 1.f, 1.f)).scattering_coefficient) : material_volume(scattering: vdf(), absorption_coefficient: color(0.f, 0.f, 0.f), scattering_coefficient: color(0.f, 0.f, 0.f));
		material_geometry tmp5(float3(0.f), 1.f, enable_round_corners ? ::state::rounded_corner_normal(radius * 0.00100000005f, across_materials, 1.f) : ::state::normal());
	} in
		material(
			thin_walled: tmp0,
			surface: tmp1,
			backface: tmp2,
			ior: tmp3,
			volume: tmp4,
			geometry: tmp5);
			

export material PCB_Prepreg_Rough(*)

[[
	::anno::display_name("PCB Prepreg - Rough"),
	::anno::description(DESCRIPTION),
	::anno::copyright_notice(COPYRIGHT),
	::anno::key_words(string[]("dielectric", "pcb", "computer", "plastic", "translucency", "yellow", "bright", "technical", "electronic", "plate", "construction", "rough")),
	::anno::thumbnail("./.thumbs/PCB_Prepreg.PCB_Prepreg_Rough.png"),
	::anno::author("NVIDIA vMaterials"),
	::anno::contributor("Maik Rohland"),
	::anno::contributor("Ruediger Raab")
]]
= PCB_Prepreg
(
	diffuse_brightness: .6f,
	reflection_roughness: .8f,
	bump_strength: 1.f,
	subsurface_scattering: false,
	translucency_amount: .35f,
	texture_translate: float2(0.0f),
	texture_rotate: 0.0f,
	texture_scale: float2(1.0f),
	enable_round_corners: false,
	radius: 1.5f,
	across_materials: false,
	no_uv: false,
	projection_type: ::base::projection_planar,
	scale: 1.f,
	coordinate_system: ::base::texture_coordinate_object,
	uv_space_index: 0
);

export material PCB_Prepreg_Shiny(*)

[[
	::anno::display_name("PCB Prepreg - Shiny"),
	::anno::description(DESCRIPTION),
	::anno::copyright_notice(COPYRIGHT),
	::anno::key_words(string[]("dielectric", "pcb", "computer", "plastic", "translucency", "yellow", "bright", "technical", "electronic", "plate", "construction", "shiny")),
	::anno::thumbnail("./.thumbs/PCB_Prepreg.PCB_Prepreg_Shiny.png"),
	::anno::author("NVIDIA vMaterials"),
	::anno::contributor("Maik Rohland"),
	::anno::contributor("Ruediger Raab")
]]
= PCB_Prepreg
(
	diffuse_brightness: .7f,
	reflection_roughness: .25f,
	bump_strength: .5f,
	subsurface_scattering: false,
	translucency_amount: .35f,
	texture_translate: float2(0.0f),
	texture_rotate: 0.0f,
	texture_scale: float2(1.0f),
	enable_round_corners: false,
	radius: 1.5f,
	across_materials: false,
	no_uv: false,
	projection_type: ::base::projection_planar,
	scale: 1.f,
	coordinate_system: ::base::texture_coordinate_object,
	uv_space_index: 0
);