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ibl_sample_shader_lys
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ibl_sample_shader_lys [2017/05/07 20:34] adavies |
ibl_sample_shader_lys [2017/05/23 03:49] (current) |
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| ====== Image Based Lighting Sample Shader ====== | ====== Image Based Lighting Sample Shader ====== | ||
| - | Throughout the following page we are providing a free IBL sample shader, the associated source files for the shader and a general user guide in that you may test the various aspects of IBL with a minimal setup and iteration time. | + | Throughout the following page we are providing a free IBL sample shader and the associated source files. |
| - | The shader specifically covers cube maps that have been generated within Lys, though may still be a very useful general reference in other cases. | + | The shader specifically covers cube maps that have been generated within Lys using the Burley option for image based lighting but may also serve as a useful reference in general. |
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| - | - Download the shader and asset files from HERE. | + | - Download the shader and asset files from [[https://s3-us-west-2.amazonaws.com/knalduswest/docs/freeLysIblSample.zip|HERE]]. |
| - Download FX Composer from [[http://developer.download.nvidia.com/tools/FX_Composer/2.5/FX_Composer2_2.51.0701.1135.exe|HERE]] & install. | - Download FX Composer from [[http://developer.download.nvidia.com/tools/FX_Composer/2.5/FX_Composer2_2.51.0701.1135.exe|HERE]] & install. | ||
| - Extract the .zip file to a location of your choosing. | - Extract the .zip file to a location of your choosing. | ||
| Line 23: | Line 23: | ||
| - Enjoy! | - Enjoy! | ||
| - | Below is the full shader. You can download the sample shader and assets HERE | + | Below is the full shader. You can download the sample shader and assets [[https://s3-us-west-2.amazonaws.com/knalduswest/docs/freeLysIblSample.zip|HERE]] |
| <code glsl> | <code glsl> | ||
| /* | /* | ||
| - | % Free IBL sample using cube map exported from Knaldtech's tool Lys | + | % Copyright 2017 Knald Technologies, LLC |
| + | % See LICENSE.txt for licensing and redistribution terms. | ||
| + | % Free IBL sample using cube map exported from Knaldtech's tool Lys. https://www.knaldtech.com/lys/ | ||
| % The cube map was made with offset set to 3 and exported as GGX with Burley roughness drop. | % The cube map was made with offset set to 3 and exported as GGX with Burley roughness drop. | ||
| */ | */ | ||
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| // form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find | // form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find | ||
| // a more detailed description in "Pre-convolved Cube Maps vs Path Tracers" | // a more detailed description in "Pre-convolved Cube Maps vs Path Tracers" | ||
| + | // Despite the difference in distribution of MIPs the lit specular response resulting from | ||
| + | // the “roughness texture” will be identical to existing PBR based game engines and tools. | ||
| float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | ||
| { | { | ||
| Line 189: | Line 193: | ||
| | | ||
| // material properties from texture | // material properties from texture | ||
| - | float smoothness = smoothness_tex.Sample(samLinear, st).x; // not gamma corrected | + | float smoothness = smoothness_tex.Sample(samLinear, st).x; // inverted roughness texture map (1-x) and no gamma correction |
| float perceptualRoughness = 1.0 - smoothness; | float perceptualRoughness = 1.0 - smoothness; | ||
| + | //float perceptualRoughness = roughness_tex.Sample(samLinear, st).x; // For those using roughness texture maps use this line instead to initialize perceptualRoughness. | ||
| float metalness = metalness_tex.Sample(samLinear, st).x; // not gamma corrected | float metalness = metalness_tex.Sample(samLinear, st).x; // not gamma corrected | ||
| float3 texNormal = 2*normal_tex.Sample(samLinear, st).xyz - 1.0; // not gamma corrected | float3 texNormal = 2*normal_tex.Sample(samLinear, st).xyz - 1.0; // not gamma corrected | ||
ibl_sample_shader_lys.1494189246.txt.gz · Last modified: 2017/05/23 03:49 (external edit)
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