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rng: Added unit circle.

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This commit is contained in:
Branimir Karadžić
2016-12-31 18:40:40 -08:00
parent 0635558136
commit 0ee444d218
1 changed files with 20 additions and 9 deletions
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29
include/bx/rng.h
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@@ -109,16 +109,27 @@ namespace bx
return 2.0f * bx::frnd(_rng) - 1.0f;
}
/// Generate random point on unit circle.
template <typename Rng>
inline void randUnitCircle(float _result[3], Rng* _rng)
{
const float angle = frnd(_rng) * pi * 2.0f;
_result[0] = fcos(angle);
_result[1] = 0.0f;
_result[2] = fsin(angle);
}
/// Generate random point on unit sphere.
template <typename Rng>
inline void randUnitSphere(float _result[3], Rng* _rng)
{
float rand0 = frnd(_rng) * 2.0f - 1.0f;
float rand1 = frnd(_rng) * pi * 2.0f;
const float rand0 = frnd(_rng) * 2.0f - 1.0f;
const float rand1 = frnd(_rng) * pi * 2.0f;
const float sqrtf1 = fsqrt(1.0f - rand0*rand0);
float sqrtf1 = sqrtf(1.0f - rand0*rand0);
_result[0] = sqrtf1 * cosf(rand1);
_result[1] = sqrtf1 * sinf(rand1);
_result[0] = sqrtf1 * fcos(rand1);
_result[1] = sqrtf1 * fsin(rand1);
_result[2] = rand0;
}
@@ -165,15 +176,15 @@ namespace bx
tt = 2.0f * tt - 1.0f;
const float phi = (ii + 0.5f) / _num;
const float phi = (ii + 0.5f) / _num;
const float phirad = phi * 2.0f * pi;
const float st = sqrtf(1.0f-tt*tt) * _scale;
const float st = fsqrt(1.0f-tt*tt) * _scale;
float* xyz = (float*)data;
data += _stride;
xyz[0] = st * cosf(phirad);
xyz[1] = st * sinf(phirad);
xyz[0] = st * fcos(phirad);
xyz[1] = st * fsin(phirad);
xyz[2] = tt * _scale;
}
}