diff --git a/code/game/bg_misc.c b/code/game/bg_misc.c
index 5ef0eda..4e8a5b6 100644
--- a/code/game/bg_misc.c
+++ b/code/game/bg_misc.c
@@ -1848,3 +1848,58 @@ char *EndWord(char *pos)
 
 	return pos;
 }
+
+void BG_PrepareRay(bgRay_t* ray, vec3_t origin, vec3_t dir) {
+	if(ray == NULL) {
+		return;
+	}
+
+	VectorCopy(origin, ray->origin);
+	VectorCopy(dir, ray->direction);
+	VectorCopy(dir, ray->inverse_direction);
+	VectorInverse(ray->inverse_direction);
+
+	ray->sign[0] = (ray->inverse_direction[0] < 0);
+	ray->sign[1] = (ray->inverse_direction[1] < 0);
+	ray->sign[2] = (ray->inverse_direction[2] < 0);
+}
+
+int BG_RayIntersect(bgRay_t* ray, bgBBox_t* bbox) {
+	double tmin = 0.0;
+	double tmax = 0.0;
+	double tymin = 0.0;
+	double tymax = 0.0;
+	double tzmin = 0.0;
+	double tzmax = 0.0;
+
+	if(ray == NULL || bbox == NULL) {
+		return 0;
+	}
+
+	tmin = (bbox->bounds[ray->sign[0]][0] - ray->origin[0]) * ray->inverse_direction[0];
+	tmax = (bbox->bounds[1 - ray->sign[0]][0] - ray->origin[0]) * ray->inverse_direction[0];
+	tymin = (bbox->bounds[ray->sign[1]][1] - ray->origin[1]) * ray->inverse_direction[1];
+	tymax = (bbox->bounds[1 - ray->sign[1]][1] - ray->origin[1]) * ray->inverse_direction[1];
+
+	if((tmin > tymax) || (tymin > tmax)) {
+		return 0;
+	}
+
+	if(tymin > tmin) {
+		tmin = tymin;
+	}
+
+	if(tymax < tmax) {
+		tmax = tymax;
+	}
+
+	tzmin = (bbox->bounds[ray->sign[2]][2] - ray->origin[2]) * ray->inverse_direction[2];
+	tzmax = (bbox->bounds[1 - ray->sign[2]][2] - ray->origin[2]) * ray->inverse_direction[2];
+
+	if((tmin > tzmax) || (tzmin > tmax)) {
+		return 0;
+	}
+
+	return 1;
+}
+
diff --git a/code/game/bg_misc.h b/code/game/bg_misc.h
index 0c575d1..a227879 100644
--- a/code/game/bg_misc.h
+++ b/code/game/bg_misc.h
@@ -1,7 +1,37 @@
 #ifndef _BG_MISC_H
 #define _BG_MISC_H
 
+#include "q_shared.h"
+
 void BG_LanguageFilename(char *baseName,char *baseExtension,char *finalName);
 char* BG_RegisterRace( const char *name );
 
+typedef struct bgRay_s bgRay_t;
+struct bgRay_s {
+	vec3_t origin;
+	vec3_t direction;
+	vec3_t inverse_direction;
+	int sign[3];
+};
+
+/**
+ * @brief Prepares a ray with a given origin and direction.
+ * @param ray The ray.
+ * @param origin The origin.
+ * @param dir The direction.
+ */
+void BG_PrepareRay(bgRay_t* ray, vec3_t origin, vec3_t dir);
+
+typedef struct bgBBox_s bgBBox_t;
+struct bgBBox_s {
+	vec3_t bounds[2];
+};
+
+/**
+ * @brief Checks is a given ray intersects with a given bounding box.
+ * @param ray The ray.
+ * @param bbox The bounding box.
+ */
+int BG_RayIntersect(bgRay_t* ray, bgBBox_t* bbox);
+
 #endif /* _BG_MISC_H */
\ No newline at end of file