AVSim/simulation-package

1/******************************************************************************2 *	 Copyright 2024 NVIDIA Corporation. All rights reserved.3 ******************************************************************************4 5Permission is hereby granted by NVIDIA Corporation ("NVIDIA"), free of charge,6to any person obtaining a copy of the sample definition code that uses our 7Material Definition Language (the "MDL Materials"), to reproduce and distribute8the MDL Materials, including without limitation the rights to use, copy, merge,9publish, distribute, and sell modified and unmodified copies of the MDL 10Materials, and to permit persons to whom the MDL Materials is furnished to do11so, in all cases solely for use with NVIDIA's Material Definition Language,12subject to the following further conditions:13 141. The above copyright notices, this list of conditions, and the disclaimer15that follows shall be retained in all copies of one or more of the MDL16Materials, including in any software with which the MDL Materials are bundled,17redistributed, and/or sold, and included either as stand-alone text files,18human-readable headers or in the appropriate machine-readable metadata fields19within text or binary files as long as those fields can be easily viewed by the20user, as applicable.212. The name of NVIDIA shall not be used to promote, endorse or advertise any 22Modified Version without specific prior written permission, except a) to comply23 with the notice requirements otherwise contained herein; or b) to acknowledge24the contribution(s) of NVIDIA.25 26THE MDL MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS27OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,28FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,29TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR 30ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, 31INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF 32CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE33THE MDL MATERIALS OR FROM OTHER DEALINGS IN THE MDL MATERIALS.34*/35 36 37mdl 1.7;38 39import ::anno::*;40import ::base::*;41import ::df::*;42import ::math::*;43import ::state::*;44import ::tex::*;45import ::nvidia::core_definitions::blend_colors;46import ::nvidia::core_definitions::dimension;47 48 49const string COPYRIGHT = 50" Copyright 2024 NVIDIA Corporation. All rights reserved.\n"51" MDL MATERIALS ARE PROVIDED PURSUANT TO AN END USER LICENSE  AGREEMENT,\n"52" WHICH WAS ACCEPTED IN ORDER TO GAIN ACCESS TO THIS FILE.  IN PARTICULAR,\n" 53" THE MDL MATERIALS ARE PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n"54" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF\n"55" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF\n" 56" COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL NVIDIA\n"57" CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY\n"58" GENERAL, SPECIAL,  INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN\n"59" AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR\n"60" INABILITY TO USE THE MDL MATERIALS OR FROM OTHER DEALINGS IN THE MDL MATERIALS.\n";61 62annotation preview_scale( float f);63 64color vmat_file_texture(65	uniform texture_2d texture,66	::base::texture_coordinate_info uvw = ::base::texture_coordinate_info(),67	uniform float2 crop_u = float2(0.0, 1.0),68	uniform float2 crop_v = float2(0.0, 1.0),69	uniform tex::wrap_mode wrap_u = tex::wrap_repeat,70	uniform tex::wrap_mode wrap_v = tex::wrap_repeat71)72{73	return color(tex::lookup_float3(texture, float2(uvw.position.x,uvw.position.y), wrap_u, wrap_v, crop_u, crop_v));74}75 76// Returns the normal n in tangent space, given n is in internal space.77float3 transform_internal_to_tangent(float3 n)78[[ 79	::anno::hidden() 80]]81{82	return83		n.x* float3(state::texture_tangent_u(0).x,state::texture_tangent_v(0).x,state::normal().x)+84		n.y* float3(state::texture_tangent_u(0).y,state::texture_tangent_v(0).y,state::normal().y)+85		n.z* float3(state::texture_tangent_u(0).z,state::texture_tangent_v(0).z,state::normal().z);86}87 88// Returns the normal n in internal space, given n is in tangent space.89float3 transform_tangent_to_internal(float3 n)90[[ 91	::anno::hidden() 92]]93{94	return  state::texture_tangent_u(0) * n.x +95			state::texture_tangent_v(0) * n.y +96			state::normal() * n.z ;97}98 99 100 101// Returns a normal by adding a detail normal to a global normal.102// If detail blending of two normal maps gives visual artifacts, check if texture_2d are loaded103// correctly with tex::gamma_linear104 float3 add_detail_normal(float3 nd = state::normal(), float3 n = state::normal())105{106	// http://blog.selfshadow.com/publications/blending-in-detail/107	float3 n_t = transform_internal_to_tangent(n);108	float3 nd_t = transform_internal_to_tangent(nd);109 110	n_t=n_t + float3(0.,0.,1.);111	nd_t = nd_t *  float3(-1.,-1.,1.);112	n = n_t*math::dot(n_t, nd_t)/n_t.z - nd_t;113	return ::math::normalize(transform_tangent_to_internal(n));114}115 116float histogram_range(float input, float range = 1.0f, float position = 0.5f)117{	118	float low = ::math::clamp(1.0 - ::math::min(((1.0 - position) + range * 0.5), (1.0 - position) * 2), 0.0, 1.0);119	float high = ::math::clamp(math::min((position + range * 0.5 ), position * 2.0), 0.0, 1.0);120	return ::math::lerp(low, high, input);121}122 123 124 125float3 normalmap_normal(126	uniform texture_2d texture,127	float factor = 1.0,128	::base::texture_coordinate_info uvw = ::base::texture_coordinate_info()129)130{131	float3 lookup = (::tex::lookup_float3(texture, float2(uvw.position.x, uvw.position.y)) - float3(0.5)) * (factor * 2.0);132	return ::math::normalize(uvw.tangent_u * lookup.x + uvw.tangent_v * lookup.y + state::normal() * (lookup.z + (1.0 - factor)));133}134 135 136::base::texture_coordinate_info transform_coordinate_2(137	float4x4 transform										 138		[[ ::anno::description("A transformation to be applied to the source coordinates. rotation_translation_scale() is a suggested means to compute the transformation matrix.") ]],139	::base::texture_coordinate_info coordinate = ::base::texture_coordinate_info()140		[[ ::anno::description("Coordinate, typically sourced from coordinate_source or coordinate_projection.") ]]141) [[ 142	::anno::description("Transform a texture coordinate by a matrix.") ,143	::anno::noinline()144  ]]145{146	// Version 2147	float4 r_position = transform * float4(coordinate.position.x,coordinate.position.y,coordinate.position.z,1);148	float4 u = transform[0];149	float3 ru = ::math::normalize(float3(u.x,u.y,u.z));150	float cos =  ru.x; 151	float sin =  -ru.y;152	153	return ::base::texture_coordinate_info(154		float3(r_position.x,r_position.y,r_position.z),155		math::normalize(cos * coordinate.tangent_u - sin * coordinate.tangent_v),156		math::normalize(cos * coordinate.tangent_v + sin * coordinate.tangent_u));157}158 159 160// Takes the standard input that every material has. It combines a couple of161// functions in one convenience function.162::base::texture_coordinate_info vmat_transform(163								float2 translation = float2(0.0, 0.0),164								float rotation	 = 0.0,				// rotation in degrees165								float2 scaling	 = float2(1.0, 1.0),166								uniform ::base::texture_coordinate_system system = ::base::texture_coordinate_uvw,167								uniform int uv_space	   = 0168)169{170	float rotation_rad = (rotation * 3.1415926535897932384626433832f) / 180.f;171	float4x4 scale =172	float4x4(1.0 /scaling.x, 0.			 ,  0. ,	 0.,173			 0.			, 1.0 /scaling.y ,  0. ,	 0.,174			 0.			, 0.			 ,  1.0,	 0.,175			 translation.x , translation.y  ,  0.0,	 1.);176 177	float s = ::math::sin(rotation_rad);178	float c = ::math::cos(rotation_rad);179	float4x4 rotate =180	float4x4(  c  ,  -s   , 0.0 , 0.0,181			   s  ,   c   , 0.0 , 0.0,182			   0.0,   0.0 , 1.0 , 0.0,183			   0. ,   0.0 , 0.0 , 1.);184	185	return transform_coordinate_2(scale*rotate, ::base::coordinate_source(system, uv_space));186}187 188::base::texture_coordinate_info vmat_transform_post_scale(189	::base::texture_coordinate_info uvw,190	float2 scale = float2(1.0f)191)192{193	return ::base::texture_coordinate_info(194		position: float3(uvw.position.x / scale.x,195						uvw.position.y  / scale.y,196						uvw.position.z  / scale.x),197		tangent_u: uvw.tangent_u,198		tangent_v: uvw.tangent_v199	);200}201 202 203float3 rgb2hsl(float3 c)204[[205	::anno::description("Converts a color value to HSL. The function outputs the hue to \n"206						"lie in the range from 0.0-1.0."),207	::anno::author("NVIDIA vMaterials")208]]209{210	float3 hsl;211	float cMax = ::math::max(::math::max(c.x, c.y), c.z);212	float cMin = ::math::min(::math::min(c.x, c.y), c.z);213	float delta = cMax - cMin;214	215	hsl.z = (cMax + cMin) / 2.0;	216	hsl.x = ((cMax == cMin) ? 0 :217		(cMax == c.x) ? (c.y - c.z) / delta + ((c.z > c.y) ? 6.0f : 0.0f):218		(cMax == c.y) ? (c.z - c.x) / delta + 2.0 : (c.x - c.y) / delta + 4.0) / 6.0f;219	hsl.y = (hsl.z == 0.0 || hsl.z == 1.0) ? 0.0 : delta / (1.0 - ::math::abs(2.0 * hsl.z - 1.0));220	return hsl;221}222 223float f_n(float n, float a,  float h, float l) {224	float k = ::math::fmod(n + h * 12.f, 12.f);225	226	return l - a * ::math::max(-1.0f, ::math::min(::math::min(k-3.0f, 9.0f-k), 1.0f));227}228 229color hsl2rgb(float3 hsl)230[[231	::anno::description("Converts a HSL value back to a color. Note that the hue is expected to \n"232						"lie in the range from 0.0-1.0."),233	::anno::author("NVIDIA vMaterials")234]]235{236	float h = hsl.x, s = hsl.y, l = hsl.z;237	float a = s * ::math::min(l, 1.0f - l);238	return color(f_n(0.0, a, h, l),239				f_n(8.0, a, h, l),240				f_n(4.0, a, h, l));	241}242 243 244 245//246// flake noise utilities247//248// constants for numerical fitted curve to observed flake noise density behavior249// 1. no jitter, maximum flake diameter250const float4 ABCD = float4(-26.19771808f, 26.39663835f, 85.53857017f, -102.35069432f);251const float2 EF = float2(-101.42634862f, 118.45082288f);252// 2. jitter scale of 0.5f, maximum flake diameter253const float4 ABCD_J = float4(-0.87962159f, 0.91006603f, 0.76088203f, -0.24953308f);254const float2 EF_J = float2(-3.11456809f, 2.63430594f);255 256float density_to_probability(257	float4 abcd,258	float2 ef,259	float x)260{261	float xx = x * x;262	return (abcd.x * xx + abcd.y * x) / (abcd.z * xx * x + abcd.w * xx  + ef.x * x + ef.y);263}264 265 266int hash(int seed, int i)267{268	return (i ^ seed) * 1075385539;269}270int rnd_init(int3 pos)271{272	return hash(hash(hash(0, pos.x), pos.y), pos.z);273}274 275int rnd_next(int seed) {276	// xorshift32 using signed int277	seed ^= seed << 13;278	seed ^= seed >>> 17;279	seed ^= seed << 5;280	return seed;281}282 283float rnd_value(int seed)284{285	return ::math::abs(float(seed) * 4.6566e-10f);286}287 288// apply random rotation (using "Fast Random Rotation Matrices" by James Arvo)289float3 rotate_pos(float3 pos, float3 xi)290{291	float theta = ::math::PI * 2.0f * xi.x;292	float phi = ::math::PI * 2.0f * xi.y;293	float z = xi.z * 2.0f;294 295	float r = ::math::sqrt(z);296	float[2] sp_cp = ::math::sincos(phi);297	float Vx = sp_cp[0] * r;298	float Vy = sp_cp[1] * r;299	float Vz = ::math::sqrt(2.0f - z);300 301	float[2] st_ct = ::math::sincos(theta);302	float Sx = Vx * st_ct[1] - Vy * st_ct[0];303	float Sy = Vx * st_ct[0] + Vy * st_ct[1];304 305	float3x3 M(306		Vx * Sx - st_ct[1], Vx * Sy - st_ct[0], Vx * Vz,307		Vy * Sx + st_ct[0], Vy * Sy - st_ct[1], Vy * Vz,308		Vz * Sx, Vz * Sy, 1.0f - z);309 310	return M * pos;311}312 313struct flake_noise_value {	314	// flake priority (in [0..1], 0: no flake, flakes with higher priority shadow flakes "below" them)315	float priority;316	// Stores values from the functions (once normal, another time the color)317	// current pseudo random number generator seed318	int   rnd_seed;319	float4 carrier; 320};321 322// flake noise function with controllable regularity, flake size, and probability323flake_noise_value flake_noise(324	float3 pos,325	float jitter_scale	  = 1.0f,326	float flake_diameter	= 0.75f,327	float flake_probability = 1.0f)328{329	float3 base_pos = ::math::floor(pos);330	int3 base_pos_i = int3(base_pos);331 332	// limit the flake size to the allowed maximum (such that looking at all neighbors is sufficient)333	flake_diameter = ::math::min(flake_diameter, (1.5f - 0.5f * jitter_scale) / ::math::sqrt(3.0f));334	335	flake_noise_value val(0.0f, 0, float4(0.0));336 337	for (int i = -1; i < 2; ++i) {338		for (int j = -1; j < 2; ++j) {339			for (int k = -1; k < 2; ++k) {340 341				int seed = rnd_init(base_pos_i + int3(i, j, k));342 343				seed = rnd_next(seed);344				if (rnd_value(seed) > flake_probability)345					continue;346 347				seed = rnd_next(seed);348				float priority = rnd_value(seed);349				if (priority < val.priority)350					continue;				351 352				float3 flake_pos = base_pos + float3(i, j, k) + float3(0.5f);353 354				if (jitter_scale > 0.0f) {355					seed = rnd_next(seed);356					flake_pos.x += (rnd_value(seed) - 0.5f) * jitter_scale;357					seed = rnd_next(seed);358					flake_pos.y += (rnd_value(seed) - 0.5f) * jitter_scale;359					seed = rnd_next(seed);360					flake_pos.z += (rnd_value(seed) - 0.5f) * jitter_scale;361				}362 363				float3 p = pos - flake_pos;364				if (math::dot(p, p) >= flake_diameter * flake_diameter * 4.0f)365					continue;366 367				float3 xi_rot;368				seed = rnd_next(seed);369				xi_rot.x = rnd_value(seed);370				seed = rnd_next(seed);371				xi_rot.y = rnd_value(seed);372				seed = rnd_next(seed);373				xi_rot.z = rnd_value(seed);374				p = rotate_pos(p, xi_rot);375				376				if (math::abs(p.x) <= flake_diameter &&377					::math::abs(p.y) <= flake_diameter &&378					::math::abs(p.z) <= flake_diameter)379				{380					val.priority = priority;381					val.rnd_seed = seed;382				}383			}384		}385	}386 387	return val;388}389 390flake_noise_value flake_noise(391	float3 position,392	float density = 0.5f,393	bool jittered = false) // jittered: slightly slower and slightly less uniform394{395	float probability = density_to_probability(jittered ? ABCD_J : ABCD, jittered ? EF_J : EF, ::math::saturate(density));396 397	return flake_noise(pos: position, jitter_scale: jittered ? 0.5f : 0.0f, flake_diameter: (jittered ? 1.25f : 1.5f) / ::math::sqrt(3.0f), flake_probability: probability);398}399 400// create a flake normal by importance sampling the Beckmann distribution with given roughness401flake_noise_value flake_normal(402	flake_noise_value val,403	float spread)404{405	if (val.priority <= 0.0f)406	{407		val.carrier = float4(::state::normal().x, ::state::normal().y, ::state::normal().z, 1.0);408		return val;409	}410	411	int seed  = rnd_next(val.rnd_seed);412	float xi0 = rnd_value(seed);413	seed = rnd_next(seed);414	float xi1 = rnd_value(seed);415	416	float phi = ::math::PI * 2.0f * xi0;417 418	float roughness = spread * spread;419 420	float tantheta = ::math::sqrt(-roughness * roughness * ::math::log(1.0f - xi1));421	float sintheta = tantheta / ::math::sqrt(1.0f + tantheta * tantheta);422	float costheta = ::math::sqrt(1.0f - sintheta * sintheta);423 424	float[2] scphi = ::math::sincos(phi);425	426	val.rnd_seed = seed;427	428	float3 normal = ::state::texture_tangent_u(0) * scphi[1] * sintheta +429		::state::texture_tangent_v(0) * scphi[0] * sintheta +430		::state::normal() * costheta;431	432	val.carrier = float4(normal.x, normal.y, normal.z, 1.0);433		434	435	return val;	436}437 438 439 440 441 442export material Silk_Crepe_de_Chine(443	color fabric_color = color(0.982251f, 0.982251f, 0.982251f) [[444		::anno::description("Choose the color of the fabric."),445		::anno::display_name("Fabric  Color"),446		::anno::in_group("Appearance"),447		::anno::ui_order(0)448	]],449	float color_deviation = 0.f [[450		::anno::description("Adds a variation to the reflection colors of the fabric. Higher values lead to more drastical color changes."),451		::anno::display_name("Color Deviation"),452		::anno::in_group("Appearance"),453		::anno::hard_range(0.f, 1.f),454		::anno::ui_order(1)455	]],456	float highlight_saturation = 0.79f [[457		::anno::description("Higher values cause reflected light to be tinted in the color of the material."),458		::anno::display_name("Highlight Saturation"),459		::anno::in_group("Appearance"),460		::anno::hard_range(0.f, 1.f),461		::anno::ui_order(2)462	]],463	float diffuse_weight = 0.19f [[464		::anno::description("Increasing the diffuse contribution make the material appear more flat and takes away some of its shininess."),465		::anno::display_name("Diffuse Amount"),466		::anno::in_group("Appearance"),467		::anno::hard_range(0.f, 1.f),468		::anno::ui_order(3)469	]],470	float transmissive_weight = 0.24f [[471		::anno::description("Lets light pass through the material and illuminate it from the other side."),472		::anno::display_name("Translucency"),473		::anno::in_group("Appearance"),474		::anno::hard_range(0.f, 1.f),475		::anno::ui_order(4)476	]],477	float bump_strength = 0.70f [[478		::anno::description("Specifies the strength of the bump."),479		::anno::display_name("Bump Strength"),480		::anno::in_group("Appearance"),481		::anno::hard_range(0.f, 1.f),482		::anno::ui_order(5)483	]],484	float2 texture_translate = float2(0.f) [[485		::anno::description("Controls the position of the texture."),486		::anno::display_name("Texture Translate"),487		::anno::in_group("Transform"),488		::anno::ui_order(6)489	]],490	float texture_rotate = 0.f [[491		::anno::description("Rotates angle of the texture in degrees."),492		::anno::display_name("Texture Rotate"),493		::anno::in_group("Transform"),494		::anno::soft_range(0.f, 360.f),495		::anno::ui_order(7)496	]],497	float2 texture_scale = float2(1.f) [[498		::anno::description("Larger numbers increase the size."),499		::anno::display_name("Texture Scale"),500		::anno::in_group("Transform"),501		::nvidia::core_definitions::dimension(float2(1.0f, 1.0f)),502		::preview_scale(4.0f),503		::anno::ui_order(8)504	]],505	uniform int uv_space_index = 0 [[506		::anno::description("Uses selected UV space for material."),507		::anno::display_name("UV Space Index"),508		::anno::in_group("Transform"),509		::anno::ui_order(9)510	]]511 512 513)514[[515	::anno::author("NVIDIA vMaterials"),516	::anno::contributor("Rüdiger Raab"),517	::anno::display_name("Silk Crepe de Chine - White"),518	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),519	::anno::copyright_notice(COPYRIGHT),520	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine.png"),521	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "white", "light", "neutral"))522]]523 = 524	let {525		// These parameters could be exposed globally, however, they are set as constants in the material		526		float weft_deviation 	= 0.41f;  	// note that a stronger deviation will lead to clipping behavior of the527											// bsdfs when viewing them at grazing angles528		float warp_to_weft 		= 0.22f;529		float warp_weft_power		= 2.7f;	// controls the contrast of the mixing of the warp and weft with the AO texture530		531		532		// The next parameters control the width of the highlight533		float warp_roughness = 0.2f;			// Width of the warp roughness534		float weft_roughness = 0.14f;			// Width of the weft roughness535		float warpweft_noise_amount = 1.0f; 	// we use noise to introduce irregularities in the appearance of the536												// BDSF across the material surface537		538		texture_2d weave_normal_texture = 	texture_2d("./textures/crepe_de_chine_norm.jpg", ::tex::gamma_linear);539		texture_2d weave_var_texture = 	texture_2d("./textures/crepe_de_chine_var.jpg", ::tex::gamma_linear);540		texture_2d glizz_texture = 			texture_2d("./textures/fabric_noise_multi_R_noise1_G_noise_2.png", ::tex::gamma_linear);541		542		// preparing fabric colors543		// We will be deriving all colors of the fabric from a single color which requires some amount of remapping544		// the values in HSL space and then converting them back to RGB545		float3 fabric_hsl_color = rgb2hsl(float3(fabric_color));546		547		color diffuse_transmission_color = hsl2rgb(548			float3( fabric_hsl_color.x,549					fabric_hsl_color.y * ::math::pow(fabric_hsl_color.z, 0.26f),550					0.76f551			)552		);553		554		float remap_thread_brightness = fabric_hsl_color.z * 0.85 + 0.15;555		556		color warp_color = hsl2rgb(557			float3(	fabric_hsl_color.x - (color_deviation * 0.3),						// - Shifting color by color deviation558					::math::lerp(0.0f, highlight_saturation, fabric_hsl_color.y * 0.85f), //scaling the max saturation down by 15%559					remap_thread_brightness)									// remapping brightness for weft highlight560		);561		562		color weft_color = hsl2rgb(563			float3(	fabric_hsl_color.x + (color_deviation * 0.3),			// + Shifting color by color deviation564					::math::lerp(0.0f, highlight_saturation, fabric_hsl_color.y * 0.85f),565					remap_thread_brightness566			)567		);568		569		// Prepare UV coordinates for texture and noise lookups570		::base::texture_coordinate_info uvw = vmat_transform(571			translation: texture_translate,572			rotation:	texture_rotate,573			scaling:	texture_scale * 0.4f,  // scale to fit default size of 1m for UV 0...1,574			system:		::base::texture_coordinate_uvw,575			uv_space: 	uv_space_index576		);577		578		::base::texture_coordinate_info uvw_post = vmat_transform_post_scale(uvw: uvw, scale: float2(0.2f));579		580	// Flake normal581		flake_noise_value flake_noise_val = flake_noise(582			position:	float3(uvw.position * 2500.0f),583			density:	0.72f,584			jittered:	true585		);586		587		flake_noise_value flake_noise_val2 = flake_normal(588			val:		flake_noise_val,589			spread:		0.38f		// controllable from outside590		);591		592		float3 flake_normal = float3(flake_noise_val2.carrier.x, flake_noise_val2.carrier.y, flake_noise_val2.carrier.z);593		594	// TEXTURES595		// Glizz noise textures596		float3 glizz_lookup = tex::lookup_float3(597			glizz_texture, 598			float2(uvw.position.x,uvw.position.y)599		);600		601		602		// Weave AO/brightness variation603		float var_val = float3(vmat_file_texture(604			texture: 	weave_var_texture,605			uvw:		uvw_post606		)).x;607		608		float var_val_pow = ::math::pow(var_val, warp_weft_power); // the power values controls the contrast of the lookup609														// and later in the code the mixing of the warp and weft lobe610		611		float3 weave_normal = normalmap_normal(612			texture:	weave_normal_texture,613			factor:		bump_strength, 614			uvw:		uvw_post				// we use the downscaled small UV cordinates here615		);616		617	// BSDFs618		// (single) Warp BSDF619		bsdf warp_bsdf = ::df::simple_glossy_bsdf(620			roughness_u:	0.88f,621			roughness_v:	histogram_range(glizz_lookup.x, warpweft_noise_amount, warp_roughness),	// adjusting noise texture to show some glizzening effect622			tint:			warp_color,623			tangent_u: 		uvw.tangent_u,	// required to rotate the anisotropic highlight correctly624			mode: 			::df::scatter_reflect625		);626		627		// (double) Weft BSDF628		bsdf weft_bsdf = ::df::microfacet_ggx_smith_bsdf(629			roughness_u:	histogram_range(glizz_lookup.y, warpweft_noise_amount, weft_roughness),	// adjusting noise texture to show some glizzening effect630			roughness_v:	0.58f,631			tint:			weft_color,632			multiscatter_tint:	weft_color,633			tangent_u:	uvw.tangent_u	// required to rotate the anisotropic highlight correctly634		);635		636		float3 weft_left_normal = ::math::normalize(::state::normal() - uvw.tangent_u * weft_deviation);637		float3 weft_right_normal = ::math::normalize(::state::normal() + uvw.tangent_u * weft_deviation);638		639		//adding flake detail normals640		float3 weft_left_detail_normal = add_detail_normal(641			n:		weft_left_normal,	// left-shifted normal642			nd:	flake_normal643		);644		645		float3 weft_right_detail_normal = add_detail_normal(646			n:		weft_right_normal,	// right-shifted normal647			nd:	flake_normal648		);649		650		651		// Left lobe with detail normal652		bsdf left_lobe_bsdf = ::df::weighted_layer(653				weight: 1.0f,654				layer:	weft_bsdf,655				base:	bsdf(),656				normal: weft_left_detail_normal	657		);658		659		// Right lobe with detail normal660		bsdf right_lobe_bsdf = ::df::weighted_layer(661				weight: 1.0f,662				layer:	weft_bsdf,663				base:	bsdf(),664				normal: weft_right_detail_normal	665		);666 667		668		bsdf left_right_lobe_bsdf = ::df::weighted_layer(669			base:	left_lobe_bsdf,670			layer:	right_lobe_bsdf,671			weight: 0.5f672		);673		674		// Warp and Weft BSDF combined and weighted via custom curve layer675		bsdf warp_weft_combined_bsdf = ::df::custom_curve_layer(676			base: df::weighted_layer(677				layer:	warp_bsdf,678				base:	left_right_lobe_bsdf,679				weight:	var_val_pow * (warp_to_weft > 1.0f ? 1.0 - 1.0f / warp_to_weft : warp_to_weft)680			),681			layer:					bsdf(),682			normal_reflectivity:	0.11f,683			grazing_reflectivity:	1.0f,684			exponent:				3.63f,685			weight:					1.0f686		);687		688		689		// Diffuse Transmission BSDF690		bsdf diff_transmission_bsdf = ::df::diffuse_transmission_bsdf(691			tint: diffuse_transmission_color692		);693		694		// Diffuse Reflection BSDF695		bsdf diff_reflection_bsdf = ::df::diffuse_reflection_bsdf(696			tint: fabric_color697		);698		699		700		// Computing weight contributions for the BSDF components for final mix701		702		// Diffuse Transmission Component703		::df::bsdf_component diffuse_transmission_component(704			weight:  	transmissive_weight * 0.68f,705			component:	diff_transmission_bsdf706		);707		708		// Diffuse Reflection Component709		::df::bsdf_component diffuse_reflection_component(710			weight: 	diffuse_weight * 0.68f,711			component:	diff_reflection_bsdf712		);713		714		// Mixed Glossy Lobes Component715		::df::bsdf_component warp_weft_combine_component(716			weight: 2.0f - 0.68 * (transmissive_weight + diffuse_weight),717			component: warp_weft_combined_bsdf718		);719		720		// Final Mix721		bsdf final_bsdf = ::df::normalized_mix(722		components: df::bsdf_component[](723			diffuse_transmission_component,724			diffuse_reflection_component,725			warp_weft_combine_component726		));727		728		/*729		bsdf transmission_warp_weft_mix = ::df::weighted_layer(730			base:	warp_weft_combined_bsdf,731			layer:	diff_transmission_bsdf,732			weight: transmissive_weight * 0.68f733		);734		735		bsdf diffuse_warp_weft_mix = ::df::weighted_layer(736			base:	warp_weft_combined_bsdf,737			layer:	diff_reflection_bsdf,738			weight:	diffuse_weight * 0.68f739		);740		741		bsdf final_bsdf = ::df::weighted_layer(742			base:	transmission_warp_weft_mix,743			layer:	diffuse_warp_weft_mix,744			weight:	0.5f745		);746		*/747	748	} in749		material(750			thin_walled: true,751			surface: material_surface(752				scattering: final_bsdf753				),754			ior: color(1.0f),755			geometry: material_geometry(756				normal: weave_normal757			)758);759 760 761// 2762export material Silk_Crepe_de_Chine_Natural(*)763[[764	::anno::author("NVIDIA vMaterials"),765	::anno::contributor("Rüdiger Raab"),766	::anno::display_name("Silk Crepe de Chine - Natural"),767	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),768	::anno::copyright_notice(COPYRIGHT),769	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Natural.png"),770	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "natural", "light", "warm", "white"))771]] = Silk_Crepe_de_Chine(772	fabric_color:			color(1.000000f, 0.921582f, 0.644480f),773	color_deviation:		0.0f,774	highlight_saturation:	0.79f,775	diffuse_weight:			0.19f,776	transmissive_weight:	0.24f,777	bump_strength:			0.70f,778	texture_translate:		float2(0.0f),779	texture_rotate:			0.0f,780	texture_scale:			float2(1.0f),781	uv_space_index:			0782);783 784 785 786// 3787export material Silk_Crepe_de_Chine_Champagne(*)788[[789	::anno::author("NVIDIA vMaterials"),790	::anno::contributor("Rüdiger Raab"),791	::anno::display_name("Silk Crepe de Chine - Champagne"),792	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),793	::anno::copyright_notice(COPYRIGHT),794	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Champagne.png"),795	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "light", "white", "champagne", "pastel", "warm"))796]] = Silk_Crepe_de_Chine(797	fabric_color:			color(0.871367f, 0.672443f, 0.450786f),798	color_deviation:		0.08f,799	highlight_saturation:	0.79f,800	diffuse_weight:			0.19f,801	transmissive_weight:	0.24f,802	bump_strength:			0.70f,803	texture_translate:		float2(0.0f),804	texture_rotate:			0.0f,805	texture_scale:			float2(1.0f),806	uv_space_index:			0807);808 809 810 811// 4812export material Silk_Crepe_de_Chine_Rose(*)813[[814	::anno::author("NVIDIA vMaterials"),815	::anno::contributor("Rüdiger Raab"),816	::anno::display_name("Silk Crepe de Chine - Rose"),817	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),818	::anno::copyright_notice(COPYRIGHT),819	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Rose.png"),820	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "rose", "light", "warm", "pastel"))821]] = Silk_Crepe_de_Chine(822	fabric_color:			color(1.000000f, 0.491021f, 0.332452f),823	color_deviation:		0.08f,824	highlight_saturation:	0.95f,825	diffuse_weight:			0.1f,826	transmissive_weight:	0.24f,827	bump_strength:			0.70f,828	texture_translate:		float2(0.0f),829	texture_rotate:			0.0f,830	texture_scale:			float2(1.0f),831	uv_space_index:			0832);833 834 835 836// 5837export material Silk_Crepe_de_Chine_Pink(*)838[[839	::anno::author("NVIDIA vMaterials"),840	::anno::contributor("Rüdiger Raab"),841	::anno::display_name("Silk Crepe de Chine - Pink"),842	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),843	::anno::copyright_notice(COPYRIGHT),844	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Pink.png"),845	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "pink", "warm", "red"))846]] = Silk_Crepe_de_Chine(847	fabric_color:			color(0.822786f, 0.102242f, 0.144128f),848	color_deviation:		0.0f,849	highlight_saturation:	0.79f,850	diffuse_weight:			0.19f,851	transmissive_weight:	0.24f,852	bump_strength:			0.70f,853	texture_translate:		float2(0.0f),854	texture_rotate:			0.0f,855	texture_scale:			float2(1.0f),856	uv_space_index:			0857);858 859 860 861// 6862export material Silk_Crepe_de_Chine_Moss(*)863[[864	::anno::author("NVIDIA vMaterials"),865	::anno::contributor("Rüdiger Raab"),866	::anno::display_name("Silk Crepe de Chine - Moss"),867	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),868	::anno::copyright_notice(COPYRIGHT),869	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Moss.png"),870	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "green", "moss", "light"))871]] = Silk_Crepe_de_Chine(872	fabric_color:			color(0.158961f, 0.318547f, 0.045186f),873	color_deviation:		0.0f,874	highlight_saturation:	0.92f,875	diffuse_weight:			0.0f,876	transmissive_weight:	0.34f,877	bump_strength:			0.70f,878	texture_translate:		float2(0.0f),879	texture_rotate:			0.0f,880	texture_scale:			float2(1.0f),881	uv_space_index:			0882);883 884 885 886// 7887export material Silk_Crepe_de_Chine_Purple(*)888[[889	::anno::author("NVIDIA vMaterials"),890	::anno::contributor("Rüdiger Raab"),891	::anno::display_name("Silk Crepe de Chine - Purple"),892	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),893	::anno::copyright_notice(COPYRIGHT),894	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Purple.png"),895	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "purple", "saturated"))896]] = Silk_Crepe_de_Chine(897	fabric_color:			color(0.287441f, 0.006995f, 0.584078f),898	color_deviation:		0.0f,899	highlight_saturation:	0.79f,900	diffuse_weight:			0.19f,901	transmissive_weight:	0.24f,902	bump_strength:			0.70f,903	texture_translate:		float2(0.0f),904	texture_rotate:			0.0f,905	texture_scale:			float2(1.0f),906	uv_space_index:			0907);908 909 910 911// 8912export material Silk_Crepe_de_Chine_Sky_Blue(*)913[[914	::anno::author("NVIDIA vMaterials"),915	::anno::contributor("Rüdiger Raab"),916	::anno::display_name("Silk Crepe de Chine - Sky Blue"),917	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),918	::anno::copyright_notice(COPYRIGHT),919	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Sky_Blue.png"),920	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "blue", "sky", "cool"))921]] = Silk_Crepe_de_Chine(922	fabric_color:			color(0.000911f, 0.238398f, 0.708376f),923	color_deviation:		0.0f,924	highlight_saturation:	0.79f,925	diffuse_weight:			0.19f,926	transmissive_weight:	0.24f,927	bump_strength:			0.70f,928	texture_translate:		float2(0.0f),929	texture_rotate:			0.0f,930	texture_scale:			float2(1.0f),931	uv_space_index:			0932);933 934 935 936// 9937export material Silk_Crepe_de_Chine_Royal_Blue(*)938[[939	::anno::author("NVIDIA vMaterials"),940	::anno::contributor("Rüdiger Raab"),941	::anno::display_name("Silk Crepe de Chine - Royal Blue"),942	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),943	::anno::copyright_notice(COPYRIGHT),944	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Royal_Blue.png"),945	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "blue", "royal", "saturated", "cool"))946]] = Silk_Crepe_de_Chine(947	fabric_color:			color(0.004777f, 0.004777f, 0.381326f),948	color_deviation:		0.0f,949	highlight_saturation:	0.95f,950	diffuse_weight:			0.06f,951	transmissive_weight:	0.11f,952	bump_strength:			0.70f,953	texture_translate:		float2(0.0f),954	texture_rotate:			0.0f,955	texture_scale:			float2(1.0f),956	uv_space_index:			0957);958 959 960 961// 10962export material Silk_Crepe_de_Chine_Red(*)963[[964	::anno::author("NVIDIA vMaterials"),965	::anno::contributor("Rüdiger Raab"),966	::anno::display_name("Silk Crepe de Chine - Red"),967	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),968	::anno::copyright_notice(COPYRIGHT),969	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Red.png"),970	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "red", "saturated", "warm"))971]] = Silk_Crepe_de_Chine(972	fabric_color:			color(0.496933f, 0.005182f, 0.000000f),973	color_deviation:		0.0f,974	highlight_saturation:	0.95f,975	diffuse_weight:			0.06f,976	transmissive_weight:	0.11f,977	bump_strength:			0.70f,978	texture_translate:		float2(0.0f),979	texture_rotate:			0.0f,980	texture_scale:			float2(1.0f),981	uv_space_index:			0982);983 984 985 986// 11987export material Silk_Crepe_de_Chine_Yellow(*)988[[989	::anno::author("NVIDIA vMaterials"),990	::anno::contributor("Rüdiger Raab"),991	::anno::display_name("Silk Crepe de Chine - Yellow"),992	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),993	::anno::copyright_notice(COPYRIGHT),994	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Yellow.png"),995	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "yellow", "light", "warm", "saturated"))996]] = Silk_Crepe_de_Chine(997	fabric_color:			color(0.708376f, 0.456411f, 0.003035f),998	color_deviation:		0.0f,999	highlight_saturation:	0.99f,1000	diffuse_weight:			0.19f,1001	transmissive_weight:	0.24f,1002	bump_strength:			0.70f,1003	texture_translate:		float2(0.0f),1004	texture_rotate:			0.0f,1005	texture_scale:			float2(1.0f),1006	uv_space_index:			01007);1008 1009 1010 1011// 121012export material Silk_Crepe_de_Chine_Forest_Green(*)1013[[1014	::anno::author("NVIDIA vMaterials"),1015	::anno::contributor("Rüdiger Raab"),1016	::anno::display_name("Silk Crepe de Chine - Forest Green"),1017	::anno::description("A silk material woven in a Crepe de Chine fashion. It features color deviation to simulate color shifting in the material."),1018	::anno::copyright_notice(COPYRIGHT),1019	::anno::thumbnail("./.thumbs/Silk_Crepe_de_Chine.Silk_Crepe_de_Chine_Forest_Green.png"),1020	::anno::key_words(string[]("fabric", "translucent", "silk", "woven", "crepe", "chine", "iridescent", "fashion", "design", "forest", "green", "saturated", "dark"))1021]] = Silk_Crepe_de_Chine(1022	fabric_color:			color(0.001214f, 0.063010f, 0.025187f),1023	color_deviation:		0.0f,1024	highlight_saturation:	0.79f,1025	diffuse_weight:			0.19f,1026	transmissive_weight:	0.24f,1027	bump_strength:			0.70f,1028	texture_translate:		float2(0.0f),1029	texture_rotate:			0.0f,1030	texture_scale:			float2(1.0f),1031	uv_space_index:			01032);