User Tools
specular_lys
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
specular_lys [2017/05/15 17:19] adavies [Image Based Lighting Sample Shader] |
specular_lys [2017/05/15 21:55] adavies [Reflected Beam] |
||
|---|---|---|---|
| Line 132: | Line 132: | ||
| Note that our implementation of BurleyToMip() below differs from the more typical form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find a more detailed description in [[specular_lys#pre-convolved_cube_maps_vs_path_tracers|Pre-convolved Cube Maps vs Path Tracers]]. | Note that our implementation of BurleyToMip() below differs from the more typical form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find a more detailed description in [[specular_lys#pre-convolved_cube_maps_vs_path_tracers|Pre-convolved Cube Maps vs Path Tracers]]. | ||
| + | |||
| + | Despite the difference in distribution of MIPs the lit specular response resulting from the generated “roughness texture” will be identical to other PBR based game engines and tools. | ||
| <code glsl>float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | <code glsl>float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | ||
| Line 253: | Line 255: | ||
| ==== Reflected Beam ==== | ==== Reflected Beam ==== | ||
| - | [{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/reflected_beam_new.png?nolink&1075 |The view direction v reflected by dH will result in dR. Given the existing symmetry the central direction r of dR will result in dV when reflected by dH.}}] | + | [{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/reflected_beam_new.png?nolink&1075 |The view direction v reflected by dH will result in dR. Given the existing symmetry the central direction r of dR will result in dV when reflected by dH.}}]\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ |
| - | + | ||
| - | + | ||
| - | + | ||
| - | \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ | + | |
| As an approximation we can correlate size of solid angle with "blur strength"and replace ''h_dot_r'' with ''n_dot_r''. So ultimately what we do is adjust our specular power in the following way: | As an approximation we can correlate size of solid angle with "blur strength"and replace ''h_dot_r'' with ''n_dot_r''. So ultimately what we do is adjust our specular power in the following way: | ||
specular_lys.txt · Last modified: 2017/05/23 03:49 (external edit)
Page Tools
