| /****************************************************************************** |
| * 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); |
| |
|
|
