diff --git a/server/gameserver/CMakeLists.txt b/server/gameserver/CMakeLists.txt
index fbf3ce5..5571651 100644
--- a/server/gameserver/CMakeLists.txt
+++ b/server/gameserver/CMakeLists.txt
@@ -19,6 +19,7 @@ include_directories(
   /usr/include/jsoncpp
   /usr/include/hiredis
   /usr/include/eigen3
+  /usr/include/glm
   ../../third_party
   .
 )
diff --git a/server/gameserver/app.cc b/server/gameserver/app.cc
index e6c27ee..a8ed472 100755
--- a/server/gameserver/app.cc
+++ b/server/gameserver/app.cc
@@ -19,6 +19,7 @@
 #include "roommgr.h"
 #include "player.h"
 #include "playermgr.h"
+#include "collision.h"
 
 #include "ss_msgid.pb.h"
 #include "ss_proto.pb.h"
@@ -59,10 +60,11 @@ static void SavePerfLog()
 
 void App::Init(int argc, char* argv[])
 {
-    #if 0
+    #if 1
     {
         Vector2D v1(1, 1);
         Vector2D v2 = v1.Rotate(-0.25);
+        TestGlm();
         int i = 0;
     }
     #endif
diff --git a/server/gameserver/collision.cc b/server/gameserver/collision.cc
index 5263f93..d89436e 100644
--- a/server/gameserver/collision.cc
+++ b/server/gameserver/collision.cc
@@ -1,7 +1,21 @@
 #include "precompile.h"
 
 #include <algorithm>
-#include<cfloat>
+#include <cfloat>
+#include <glm/gtx/intersect.hpp>
+#include <glm/vec3.hpp>
+
+void TestGlm()
+{
+    glm::vec3 orig(0.0, 0.0, 0.0);
+    glm::vec3 dir(1.0, 1.0, 0);
+    glm::vec3 v0(0.0, 1.0, 0);
+    glm::vec3 v1(1.3, 1.0, 0);
+    glm::vec3 v2(0.0, 2.0, 0);
+    glm::vec3 baryPosition;
+    bool ret = glm::intersectRayTriangle(orig, dir, v0, v1, v2, baryPosition);
+    int i = 0;
+}
 
 bool IntersectSegmentCircle(Vector2D p0, Vector2D p1, Vector2D pos, float rad)
 {
diff --git a/server/gameserver/collision.h b/server/gameserver/collision.h
index dd543dc..9833694 100644
--- a/server/gameserver/collision.h
+++ b/server/gameserver/collision.h
@@ -5,3 +5,4 @@ bool IntersectSegmentAabb(Vector2D p0, Vector2D p1, Vector2D _min, Vector2D _max
 bool IntersectAabbCircle(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad);
 bool IntersectAabbAabb(Vector2D a_min, Vector2D a_max, Vector2D b_min, Vector2D b_max);
 bool IntersectCircleCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad);
+void TestGlm();
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 00e11a0..144c3dc 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -138,9 +138,15 @@ bool Room::RandomPos(Human* hum, float distance, Vector2D& out_pos)
     collider.rad = hum->meta->i->radius();
 
     for (auto& pair : uniid_hash_) {
-        for (auto& itr : pair.second->colliders) {
-            if (collider.Intersect(itr)) {
-                return false;
+        if (pair.second->entity_type == ET_Player ||
+            pair.second->entity_type == ET_Bullet
+            ) {
+            continue;
+        } else {
+            for (auto& itr : pair.second->colliders) {
+                if (collider.Intersect(itr)) {
+                    return false;
+                }
             }
         }
     }
@@ -180,7 +186,8 @@ void Room::CollisionDetection(Entity* sender, int detection_flags, std::vector<E
             if (sender->entity_type == ET_Bullet) {
                 Bullet* bullet = (Bullet*)sender;
                 Human* hum = (Human*)pair.second;
-                if (hum->team_id == 0 || bullet->player->team_id != hum->team_id) {
+                if (hum != bullet->player &&
+                    (hum->team_id == 0 || bullet->player->team_id != hum->team_id)) {
                     if (bullet->TestCollision(hum)) {
                         objects.push_back(hum);
                     }