Index: renderer/r_entity.c
===================================================================
--- renderer/r_entity.c	(revision 16404)
+++ renderer/r_entity.c	(working copy)
@@ -184,6 +184,52 @@
 }
 
 /**
+ * @brief Draws a marker on the ground to indicate pathing CL_AddTargeting
+ * @sa CL_AddPathing
+ * @sa RF_BOX
+ */
+static void R_DrawFloor (const entity_t * e)
+{
+	vec3_t upper, lower;
+	float dx;
+	const vec4_t color = {e->angles[0], e->angles[1], e->angles[2], e->alpha};
+
+	qglDisable(GL_TEXTURE_2D);
+	/*
+	if (!r_wire->integer)
+		qglPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	*/
+	qglEnable(GL_LINE_SMOOTH);
+
+	R_Color(color);
+
+	VectorCopy(e->origin, lower);
+	VectorCopy(e->origin, upper);
+
+	dx = PLAYER_WIDTH * 2;
+	upper[1] += PLAYER_WIDTH * 2;
+
+	qglBegin(GL_QUAD_STRIP);
+	qglVertex3fv(lower);
+	qglVertex3fv(upper);
+	lower[0] += dx;
+	upper[0] += dx;
+	qglVertex3fv(lower);
+	qglVertex3fv(upper);
+	qglEnd();
+
+	qglDisable(GL_LINE_SMOOTH);
+	/*
+	if (!r_wire->integer)
+		qglPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	*/
+
+	qglEnable(GL_TEXTURE_2D);
+
+	R_Color(NULL);
+}
+
+/**
  * @brief Draws shadow and highlight effects for the entities (actors)
  * @note The origins are already transformed
  */
@@ -302,6 +348,8 @@
 	while (e) {
 		if (e->flags & RF_BOX) {
 			R_DrawBox(e);
+		} else if (e->flags & RF_PATH) {
+			R_DrawFloor(e);
 		} else {
 			switch (e->model->type) {
 			case mod_alias_dpm:
@@ -505,7 +553,7 @@
 		R_CalcTransform(e);
 
 		if (!e->model) {
-			if (e->flags & RF_BOX)
+			if (e->flags & RF_BOX || e->flags & RF_PATH)
 				chain = &r_alpha_mesh_entities;
 			else
 				chain = &r_null_entities;
Index: shared/shared.h
===================================================================
--- shared/shared.h	(revision 16404)
+++ shared/shared.h	(working copy)
@@ -224,4 +224,6 @@
 
 #define MAX_TOKEN_CHARS     256 /* max length of an individual token */
 
+#define	DIST_EPSILON	(0.03125)
+
 #endif
Index: game/q_shared.h
===================================================================
--- game/q_shared.h	(revision 16404)
+++ game/q_shared.h	(working copy)
@@ -283,6 +283,8 @@
 /** entity->flags (render flags) */
 #define RF_TRANSLUCENT      0x00000001
 #define RF_BOX              0x00000002	/**< actor selection box */
+#define RF_PATH             0x01000000	/**< pathing marker, debugging only */
+
 /** the following ent flags also draw entity effects */
 #define RF_SHADOW           0x00000004	/**< shadow (when living) for this entity */
 #define RF_BLOOD            0x00000008	/**< blood (when dead) for this entity */
Index: client/cl_actor.c
===================================================================
--- client/cl_actor.c	(revision 16404)
+++ client/cl_actor.c	(working copy)
@@ -5066,7 +5066,66 @@
 	}
 }
 
+static const vec3_t boxShift = { PLAYER_WIDTH, PLAYER_WIDTH, UNIT_HEIGHT / 2 - 1 };
+
 /**
+ * @brief create a targeting box at the given position
+ * @sa CL_ParseClientinfo
+ */
+static void CL_AddPathingBox (pos3_t pos)
+{
+	entity_t ent;
+
+	memset(&ent, 0, sizeof(entity_t));
+	ent.flags = RF_PATH;
+
+	Grid_PosToVec(&clMap, pos, ent.origin);
+	VectorSubtract(ent.origin, boxShift, ent.origin);
+
+	/**
+	 * Paint the box green if it is reachable,
+	 * yellow if it can be entered but is too far,
+	 * or red if it cannot be entered ever.
+	 */
+	if (Grid_Fall(&clMap, pos, 1) < pos[2] - 1) {
+		VectorSet(ent.angles, 0, 0, 0); /* Can't enter - black */
+	} else {
+	    /**
+	     * Can reach - green
+	     * Passable but unreachable - yellow
+	     * Not passable - red
+	     */
+	    const int TUs = Grid_MoveLength(&clMap, pos, qfalse);
+		VectorSet(ent.angles, (TUs > CL_UsableTUs(selActor)), (TUs != ROUTING_NOT_REACHABLE), 0);
+	}
+
+	ent.alpha = 0.25;
+
+	/* add it */
+	R_AddEntity(&ent);
+}
+
+/**
+ * @brief Adds a pathing marker to the current floor when we render the world.
+ * @sa V_RenderView
+ * Draws the tracer (red, yellow, green box) on the grid
+ */
+void CL_AddPathing (void)
+{
+	pos3_t pos, mins, maxs;
+
+	VecToPos(map_min, mins);
+	VecToPos(map_max, maxs);
+
+	pos[2] = cl_worldlevel->integer;
+	for (pos[1] = max(mousePos[1] - 8, 0); pos[1] <= min(mousePos[1] + 8, PATHFINDING_WIDTH - 1); pos[1]++)
+		for (pos[0] = max(mousePos[0] - 8, 0); pos[0] <= min(mousePos[0] + 8, PATHFINDING_WIDTH - 1); pos[0]++)
+			CL_AddPathingBox(pos);
+}
+
+
+
+/**
  * @brief Plays various sounds on actor action.
  * @param[in] category
  * @param[in] gender
Index: client/cl_view.c
===================================================================
--- client/cl_view.c	(revision 16404)
+++ client/cl_view.c	(working copy)
@@ -332,6 +332,7 @@
 	refdef.worldlevel = cl_worldlevel->integer;
 }
 
+
 /**
  * @sa SCR_UpdateScreen
  */
@@ -368,6 +369,9 @@
 		LM_AddToScene();
 		/* add local entities to the renderer chain */
 		LE_AddToScene();
+		/* adds pathing data */
+		if (developer->integer & DEBUG_CLIENT)
+			CL_AddPathing();
 		/* adds target cursor */
 		CL_AddTargeting();
 		break;
Index: client/cl_actor.h
===================================================================
--- client/cl_actor.h	(revision 16404)
+++ client/cl_actor.h	(working copy)
@@ -132,6 +132,7 @@
 qboolean CL_AddUGV(le_t * le, entity_t * ent);
 
 void CL_AddTargeting(void);
+void CL_AddPathing(void);
 void CL_ActorTargetAlign_f(void);
 void CL_ActorInventoryOpen_f(void);