Catcrafts/Crafter.Math
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

added comparison

Browse source
This commit is contained in:
Jorijn van der Graaf 2026-02-19 02:36:36 +01:00
commit 05fbd3685b
5 changed files with 255 additions and 82 deletions
Download patch file Download diff file Expand all files Collapse all files

78
interfaces/Crafter.Math-Ray.cppm
View file

@ -1,78 +0,0 @@
/*
Crafter®.Math
Copyright (C) 2026 Catcrafts®
catcrafts.net
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 3.0 as published by the Free Software Foundation;
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
export module Crafter.Math:Ray;
import :Vector;
import std;
namespace Crafter {
export template<typename T>
constexpr T IntersectionTestRayTriangle(Vector<T, 3, 0> vert0, Vector<T, 3, 0> vert1, Vector<T, 3, 0> vert2, Vector<T, 3, 0> rayOrigin, Vector<T, 3, 0> rayDir) {
constexpr T EPSILON = 0.0000001;
Vector<T, 3, 0> edge1 = vert1 - vert0;
Vector<T, 3, 0> edge2 = vert2 - vert0;
Vector<T, 3, 0> h = Vector<T, 3, 0>::Cross(rayDir, edge2);
T determinant = Vector<T, 3, 0>::Dot(edge1, h);
if (determinant <= EPSILON) {
return std::numeric_limits<T>::max();
}
T inverse_determinant = T(1) / determinant;
Vector<T, 3, 0> origins_diff_vector = rayOrigin - vert0;
T u = Vector<T, 3, 0>::Dot(origins_diff_vector, h) * inverse_determinant;
if (u < 0.0 || u > 1.0)
{
return std::numeric_limits<T>::max();
}
Vector<T, 3, 0> q = Vector<T, 3, 0>::Cross(origins_diff_vector, edge1);
T v = inverse_determinant * Vector<T, 3, 0>::Dot(rayDir, q);
if (v < 0.0 || u + v > 1.0) {
return std::numeric_limits<T>::max();
}
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();
}
}
}