Original article: https://iquilezles.org/www/articles/noacos/noacos.htm
kevinmoran
kevinmoran
/ cubicSinf.h
Created
October 9, 2019 15:49
Cubic approximation of sinf(), if you only need something sinusoid-ish
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| // Source: https://www.youtube.com/watch?v=1xlCVBIF_ig | |
| float cubicSinf(float x) | |
| { | |
| float t = x * 0.15915f; | |
| t = t - (int)t; | |
| return 20.785f * t * (t - 0.5f) * (t - 1.f); | |
| } |
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| // From: https://web.archive.org/web/20080228213915/http://www.devmaster.net/forums/showthread.php?t=5784 | |
| float sinApprox(float x) | |
| { | |
| const float kPI32 = 3.14159265359f; | |
| const float B = 4/kPI32; | |
| const float C = -4/(kPI32*kPI32); | |
| float y = B * x + C * x * abs(x); |
kevinmoran
/ noacos_derivation.md
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