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author | Nat Lasseter <user@4574.co.uk> | 2024-06-13 14:38:50 +0100 |
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committer | Nat Lasseter <user@4574.co.uk> | 2024-06-13 14:38:50 +0100 |
commit | 69e0357135a49157ed7a8c2e57c331e960422e15 (patch) | |
tree | 2402ef255cf24afff14ac653826386e615faee8b /lib/vec3.rb | |
parent | b976ce98be7275bf92e01f6c86bf2b694530481e (diff) |
Chapter 11
Diffstat (limited to 'lib/vec3.rb')
-rw-r--r-- | lib/vec3.rb | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/vec3.rb b/lib/vec3.rb index 3069b65..478fe4c 100644 --- a/lib/vec3.rb +++ b/lib/vec3.rb @@ -60,6 +60,13 @@ class Vec3 self - normal * dot(normal) * 2 end + def refract(normal, etaratio) + costheta = [(-self).dot(normal), 1.0].min + rout_perp = (self + normal * costheta) * etaratio + rout_parr = normal * -((1.0 - rout_perp.mag_sqr).abs ** 0.5) + rout_perp + rout_parr + end + def in_unit_sphere? mag_sqr < 1 end |