diff options
author | Charlie Jolly <charlie> | 2021-03-23 12:21:56 +0300 |
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committer | Charlie Jolly <mistajolly@gmail.com> | 2021-03-23 12:59:20 +0300 |
commit | d3758892987d76749fdf1211ed27ff77f39b5b3b (patch) | |
tree | 0e0b6b2a614b9829255cae77fb75f93696e7df7b /source/blender/blenlib/BLI_float3.hh | |
parent | 4c19fcacc0b71271ca2fafc87ef5772a819e7075 (diff) |
Nodes: Add Refract and Faceforward functions to Vector Maths nodes
Cycles, Eevee, OSL, Geo, Attribute
Based on outdated refract patch D6619 by @cubic_sloth
`refract` and `faceforward` are standard functions in GLSL, OSL and Godot shader languages.
Adding these functions provides Blender shader artists access to these standard functions.
Reviewed By: brecht
Differential Revision: https://developer.blender.org/D10622
Diffstat (limited to 'source/blender/blenlib/BLI_float3.hh')
-rw-r--r-- | source/blender/blenlib/BLI_float3.hh | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_float3.hh b/source/blender/blenlib/BLI_float3.hh index 7e49cc89b52..cbc4d4ed366 100644 --- a/source/blender/blenlib/BLI_float3.hh +++ b/source/blender/blenlib/BLI_float3.hh @@ -191,6 +191,24 @@ struct float3 { return result; } + static float3 refract(const float3 &incident, const float3 &normal, const float eta) + { + float3 result; + float k = 1.0f - eta * eta * (1.0f - dot(normal, incident) * dot(normal, incident)); + if (k < 0.0f) { + result = float3(0.0f); + } + else { + result = eta * incident - (eta * dot(normal, incident) + sqrt(k)) * normal; + } + return result; + } + + static float3 faceforward(const float3 &vector, const float3 &incident, const float3 &reference) + { + return dot(reference, incident) < 0.0f ? vector : -vector; + } + static float3 safe_divide(const float3 &a, const float3 &b) { float3 result; |