/****************************************************************************** * 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 Material Definition Language (the "MDL Materials"), to reproduce and distribute the MDL Materials, including without limitation the rights to use, copy, merge, publish, distribute, and sell modified and unmodified copies of the MDL Materials, and to permit persons to whom the MDL Materials is furnished to do so, in all cases solely for use with NVIDIA's Material Definition Language, subject to the following further conditions: 1. The above copyright notices, this list of conditions, and the disclaimer that follows shall be retained in all copies of one or more of the MDL Materials, including in any software with which the MDL Materials are bundled, redistributed, and/or sold, and included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user, as applicable. 2. The name of NVIDIA shall not be used to promote, endorse or advertise any Modified Version without specific prior written permission, except a) to comply with the notice requirements otherwise contained herein; or b) to acknowledge the contribution(s) of NVIDIA. THE MDL MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE THE MDL MATERIALS OR FROM OTHER DEALINGS IN THE MDL MATERIALS. */ mdl 1.4; import ::base::*; import ::anno::*; 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"; float remap_xy_to_0_1(float input, float x, float y) { return (input - x)/(y - x); } float histogram_scan_big(float input, float width, float position) { return ::math::clamp( remap_xy_to_0_1(input, ::math::lerp(-width, 1.0, position), ::math::lerp(0.0, 1.0 + width, position)), 0.0, 1.0); } float histogram_range(float input, float range, float position) { 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( uniform float2 translation = float2(0.0, 0.0), uniform float rotation = 0.0, uniform float2 scaling = float2(1.0, 1.0), uniform ::base::texture_coordinate_system system = ::base::texture_coordinate_uvw, uniform int uv_space = 0 ) { 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); float c = ::math::cos(rotation); 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 ::base::transform_coordinate(scale*rotate, ::base::coordinate_source(system, uv_space)); } float3 srgb2rgb(float3 val) { return ::math::pow(::math::max(val, float3(0.0f)), 2.2); } float uint2float(int x) { return float(x & 0x7FFFFFFF) + (x < 0 ? 2147483648.0 : 0.0); } int lowbias32(int x) { x ^= x >>> 16; x *= 0x7feb352d; x ^= x >>> 15; x *= 0x846ca68b; x ^= x >>> 16; return x; } float2 rnd22(int2 p) { float2 ret_val = float2( uint2float(lowbias32(p[0] + lowbias32(p[1]))) / 4294967296.f, uint2float(lowbias32(p[0] + 32000 + lowbias32(p[1]))) / 4294967296.f ); return ret_val; } float2x2 invert_2x2(float2x2 M) { float det = M[0][0]*M[1][1] - M[0][1]*M[1][0]; //https://www.chilimath.com/lessons/advanced-algebra/inverse-of-a-2x2-matrix/ return (1.0 / det) * float2x2(M[1][1], -M[0][1], -M[1][0], M[0][0]); } float3 nonrepeat_lookup( uniform texture_2d texture = texture_2d(), ::base::texture_coordinate_info uvw = ::base::coordinate_source(), float texture_scale = 1.0, float3 average_color = float3(0.5), float patch_size = 8.0 ) { float2 uv_in = float2(uvw.position[0], uvw.position[1]) * texture_scale; float Z = patch_size; // patch scale inside example texture float CON = 1.0f; float3 O = float3(0.f); float2x2 M0 = float2x2(1.f,0.f, 0.5f, ::math::sqrt(3.f)/2.f); float2x2 M = invert_2x2(M0); // transform matrix <-> tilted space float2 U = uv_in; float2 V = M * uv_in; //pre-tilted hexa coordinates int2 I = int2(::math::floor(V)); // hexa-tile id // The mean color needs to be determined in Photoshop then to make the // average color work out, take the float value and calculate the apropriate // mean value as (value^(1/2.2)) float3 m = average_color; float3 F = float3(::math::frac(V)[0], ::math::frac(V)[1], 0.f), W; F[2] = 1.0 - F[0] - F[1]; // local hexa coordinates if( F[2] > 0.f ) O = (W[0] = F[2]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I))) - m*float(CON)) + (W[1] = F[1]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I+int2(0,1)))) - m*float(CON)) + (W[2] = F[0]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I+int2(1,0)))) - m*float(CON)); else O = (W[0] = -F[2]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I+int2(1)))) - m*float(CON)) + (W[1] = 1.f - F[1]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I+int2(1, 0)))) - m*float(CON)) + (W[2] = 1.f - F[0]) * (( ::tex::lookup_float3(texture, U/Z-rnd22(I+int2(0, 1)))) - m*float(CON)); O = m + O/::math::length(W); O = ::math::clamp( (O), 0.0, 1.0); return float3(O); } color endless_texture( uniform texture_2d texture = texture_2d(), ::base::texture_coordinate_info uvw = ::base::coordinate_source(), float texture_scale = 10.0, float3 average_color = float3(0.5, 0.5, 1.0), float patch_size = 8.0, bool gamma_correct_lookup = true ) { return gamma_correct_lookup ? color(srgb2rgb( nonrepeat_lookup ( texture: texture, uvw: uvw, texture_scale: texture_scale, average_color: average_color, patch_size: patch_size )) ) : color(nonrepeat_lookup ( texture: texture, uvw: uvw, texture_scale: texture_scale, average_color: average_color, patch_size: patch_size )); } float3 endless_normal( uniform texture_2d texture = texture_2d(), float factor = 1.0, bool flip_tangent_u = false, bool flip_tangent_v = false, ::base::texture_coordinate_info uvw = ::base::coordinate_source(), float texture_scale = 1.0, float3 average_color = float3(0.5, 0.5, 1.0), float patch_size = 8.0 ) { float3 transformed_tangent_u = flip_tangent_u ? uvw.tangent_u : - uvw.tangent_u; float3 transformed_tangent_v = flip_tangent_v ? uvw.tangent_v : - uvw.tangent_v; if (flip_tangent_u) transformed_tangent_u=-transformed_tangent_u; if (flip_tangent_v) transformed_tangent_v=-transformed_tangent_v; // normalized Lookup float3 tangent_space_normal = (nonrepeat_lookup ( texture: texture, uvw: uvw, texture_scale: texture_scale, average_color: average_color, patch_size: patch_size ) - 0.5) * (2.0 * factor); return ::math::normalize(uvw.tangent_u * tangent_space_normal.x + uvw.tangent_v * tangent_space_normal.y + ::state::normal()*1.0); } float3 normalmap_normal( uniform texture_2d texture, float factor = 1.0, ::base::texture_coordinate_info uvw = ::base::texture_coordinate_info() ) { float3 lookup = (::tex::lookup_float3(texture, float2(uvw.position.x, uvw.position.y)) - 0.5) * (factor * 2.0); return ::math::normalize(uvw.tangent_u * lookup.x + uvw.tangent_v * lookup.y + ::state::normal()); } export material Gravel_Track_Ballast( uniform bool infinite_tiling = true [[ ::anno::display_name("Infinite Tiling"), ::anno::description("Enables infinite tiling feature which removes tiling artifacts."), ::anno::in_group("Appearance") ]], float infinite_texture_scale = .25f [[ ::anno::display_name("Infinite Tiling Clarity"), ::anno::description("Adjusts the patch size of the infinite tiling. Lower values result in larger patches."), ::anno::hard_range(0.0f, 1.0f), ::anno::in_group("Appearance") ]], float gravel_brightness = 0.5f [[ ::anno::display_name("Gravel Brightness"), ::anno::description("Adjusts the brightness of the gravel."), ::anno::hard_range(0.0f, 1.0f), ::anno::in_group("Appearance") ]], float gravel_roughnes = 0.5f [[ ::anno::display_name("Gravel Roughness"), ::anno::description("Adjusts the roughness of the gravel."), ::anno::hard_range(0.0f, 1.0f), ::anno::in_group("Appearance") ]], float bump_factor = 1.0f [[ ::anno::display_name("Bump Factor"), ::anno::description("Determines the degree of bumpiness."), ::anno::soft_range(0.f, 1.f), ::anno::hard_range(0.f, 2.f), ::anno::in_group("Appearance") ]], uniform float2 texture_translate = float2(0.f) [[ ::anno::display_name("Translate"), ::anno::description("Offsets the position of the material."), ::anno::in_group("Transform") ]], uniform float texture_rotate = 0.f [[ ::anno::description("Rotates the material."), ::anno::display_name("Rotate"), ::anno::in_group("Transform") ]], uniform float2 texture_scale = float2(1.0f) [[ ::anno::description("Scales the material."), ::anno::display_name("Scale"), ::nvidia::core_definitions::dimension(float2(1.0, 1.0)), ::anno::in_group("Transform") ]], uniform int uv_space = 0 [[ ::anno::display_name("UV Space Index"), ::anno::in_group("Advanced") ]] ) [[ ::anno::author("NVIDIA vMaterials"), ::anno::display_name("Gravel Track Ballast"), ::anno::description("Track ballast material made from crushed rocks."), ::anno::copyright_notice(COPYRIGHT), ::anno::thumbnail("./.thumbs/Gravel_Track_Ballast.Gravel_Track_Ballast.png"), ::anno::key_words(string[]("aec", "gravel", "ground", "construction", "exterior", "crushed", "rocks", "stones", "hard", "track", "ballast", "gray")) ]] = let { float infinite_texture_scale_remap = 1.0f + infinite_texture_scale * 49.0f; bool tmp0 = false; material_surface tmp1( ::df::custom_curve_layer(0.0399999991f, 1.f, 5.f, histogram_scan_big(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[1], 0.632000029f, 0.762000024f), ::df::microfacet_ggx_smith_bsdf(histogram_range(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 1.f, ::math::lerp(0.5f, 0.899999976f, gravel_roughnes)) * histogram_range(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 1.f, ::math::lerp(0.5f, 0.899999976f, gravel_roughnes)), histogram_range(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 1.f, ::math::lerp(0.5f, 0.899999976f, gravel_roughnes)) * histogram_range(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[0], 1.f, ::math::lerp(0.5f, 0.899999976f, gravel_roughnes)), color(1.f, 1.f, 1.f), ::state::texture_tangent_u(0), ::df::scatter_reflect, ""), ::df::diffuse_reflection_bsdf(::nvidia::core_definitions::blend_colors(::nvidia::core_definitions::blend_colors(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_diff.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.513999999f, 0.476000011f, 0.43900001f), infinite_texture_scale_remap, true) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_diff.jpg", ::tex::gamma_srgb), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint, color(::math::lerp(0.621000051f, 1.f, gravel_brightness)), ::base::color_layer_multiply, 1.f).tint, color(float3(infinite_tiling ? endless_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.549000025f), infinite_texture_scale_remap, false) : ::base::file_texture(texture_2d("./textures/gravel_track_ballast_multi_R_rough_G_ao.jpg", ::tex::gamma_linear), color(0.f, 0.f, 0.f), color(1.f, 1.f, 1.f), ::base::mono_alpha, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), float2(0.f, 1.f), float2(0.f, 1.f), ::tex::wrap_repeat, ::tex::wrap_repeat, false).tint)[1]), ::base::color_layer_multiply, 1.f).tint, 0.f, ""), ::state::normal()), 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)); material_volume tmp4 = 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, infinite_tiling ? endless_normal(texture_2d("./textures/gravel_track_ballast_norm.jpg", ::tex::gamma_linear), bump_factor, false, false, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space), infinite_texture_scale_remap, float3(0.5f, 0.5f, 1.f), infinite_texture_scale_remap) : normalmap_normal(texture_2d("./textures/gravel_track_ballast_norm.jpg", ::tex::gamma_linear), bump_factor, vmat_transform(texture_translate, texture_rotate, texture_scale, ::base::texture_coordinate_uvw, uv_space))); } in material( thin_walled: tmp0, surface: tmp1, backface: tmp2, ior: color(1.f, 1.f, 1.f), volume: tmp4, geometry: tmp5);