Catcrafts/Crafter.Math
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ray sphere test

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This commit is contained in:
Jorijn van der Graaf 2026-02-11 04:28:54 +01:00
commit 2daa51680a
3 changed files with 29 additions and 7 deletions
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21
interfaces/Crafter.Math-Ray.cppm
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@ -54,4 +54,25 @@ namespace Crafter {
return inverse_determinant * Vector<T, 3, 0>::Dot(edge2, q);
}
export template<typename T>
constexpr T IntersectionTestRaySphere(Vector<T, 3, 0> position, T radius, Vector<T, 3, 0> rayOrigin, Vector<T, 3, 0> rayDir) {
T a = Vector<T, 3, 0>::Dot(rayDir, rayDir);
T b = Vector<T, 3, 0>::Dot(rayDir, (T(2) * (rayOrigin - position)));
T c = Vector<T, 3, 0>::Dot(position, position) + Vector<T, 3, 0>::Dot(rayOrigin, rayOrigin) - T(2) * Vector<T, 3, 0>::Dot(rayOrigin, position) - radius * radius;
T d = b * b + (T(-4)) * a * c;
if (d < 0) {
return std::numeric_limits<T>::max();
}
d = std::sqrt(d);
float t = (T(-0.5)) * (b + d) / a;
if (t > T(0)) {
return t;
} else {
return std::numeric_limits<T>::max();
}
}
}