rename Intersects to distance

include/blitz/maths/Physics.h

@@ -22,14 +22,8 @@ inline AABB operator+(const AABB& aabb, const Vec3f& offset) {
 	return result;
 }
 
-/**
- * @brief returns whether the provided ray intersects with the bounding box
- * 
- * @param ray 
- * @param aabb 
- * @return true 
- * @return false 
- */
+float Distance(const Ray& ray, const AABB& aabb);
+
 bool Intersects(const Ray& ray, const AABB& aabb);
 
 }  // namespace maths

src/blitz/maths/Physics.cpp

@@ -1,6 +1,8 @@
 #include "blitz/maths/Physics.h"
 #include "blitz/maths/Vector.h"
 
+#include <cmath>
+
 namespace blitz {
 namespace maths {
 
@@ -11,7 +13,7 @@ namespace maths {
 *  or if any coordinate in `ray` is `NAN` or `inf` or if any coordinate in
 *  `aabb` is `NAN` the result is unspecified.
  * */
-bool Intersects(const Ray& ray, const AABB& aabb) {
+float Distance(const Ray& ray, const AABB& aabb) {
 
 	// This function calculates smallest interval I = ] a, b [, for strictly positive a and b
 	// such that for all t in I, for all l, r, o, d corresponding
@@ -38,12 +40,23 @@ bool Intersects(const Ray& ray, const AABB& aabb) {
 	l = Min(l, r);
 	r = Max(l, r);
 
+	float tmin = ReduceMax(l);
+	float tmax = ReduceMin(r);
+
 	// Since Min propagates NANs and ReduceMin doesn't, and since NAN !< <any float>
 	// the inequality becomes ignored for coordinates where a NAN is involved
 	// (as a result of 0.0 / 0.0). If all coordinates are NAN, this means
 	// that the box is reduced to a point and the ray has direction 0,
-	// in which case this returns false
-	return fmaxf(ReduceMax(l), 0.0f) < ReduceMin(r);
+	// in which case this returns -1
+	if (tmin <= tmax) {
+		return std::fmaxf(tmin, 0.0f);
+	}
+
+	return -1.0f;
+}
+
+bool Intersects(const Ray& ray, const AABB& aabb) {
+	return Distance(ray, aabb) >= 0.0f;
 }
 
 }  // namespace maths

src/server/game/ServerGame.cpp

@@ -41,7 +41,7 @@ void ServerGame::CheckShoot(game::PlayerID shooter, Vec3f position, float yaw, f
 	};
 
 	for (const auto& [playerId, player] : GetPlayers()) {
-		if (playerId != shooter && maths::Intersects(shootRay, playerStaticAABB + player.GetPosition()) > 0.0f) {
+		if (playerId != shooter && maths::Distance(shootRay, playerStaticAABB + player.GetPosition()) > 0.0f) {
 			utils::LOG("[Server] " + player.GetName() + " a été touché !");
 		}
 	}

test/test_intersects.cpp

@@ -10,21 +10,23 @@
 using namespace blitz;
 using namespace maths;
 
-#define let auto
+#define let auto // sexy boiiii
 
 static void test_basic() {
     let box = AABB { {-1.0f, -1.0f, -1.0f}, {1.0f, 1.0f, 1.0f} };
     let ray = Ray { {-3.0f, 0.0f, 0.0f}, {1.0f, 0.0f, 0.0f} };
 
-    blitz_test_assert(Intersects(ray, box));
+    blitz_test_assert(Distance(ray, box));
 }
 
+
+
 static void test_shifted() {
 
     let box = AABB { {-1.0f, -1.0f, -1.0f}, {1.0f, 1.0f, 1.0f} };
     let ray = Ray { {-3.0f, 0.0f, 100.0f}, {1.0f, 0.0f, 0.0f} };
 
-    blitz_test_assert(!Intersects(ray, box));
+    blitz_test_assert(!Distance(ray, box));
 }
 
 int main(int argc, const char* args[]) {