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ibl_sample_shader_lys
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ibl_sample_shader_lys [2017/05/15 00:37] adavies |
ibl_sample_shader_lys [2017/05/16 02:53] adavies [Downloading and running the shader in FX Composer] |
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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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| - 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> | ||
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| % Free IBL sample using cube map exported from Knaldtech's tool Lys. https://www.knaldtech.com/lys/ | % 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. | ||
| + | % 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. | ||
| */ | */ | ||
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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) | ||
| { | { | ||
ibl_sample_shader_lys.txt · Last modified: 2017/05/23 03:49 (external edit)
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