Core/Collision: Models with flag MOD_M2 (mostly trees, among some other objects) should not be taken into account for LoS checks, this check does not apply to gameobjects (yet)

closes #3495

Signed-off-by: Subv <s.v.h21@hotmail.com>

src/server/collision/Models/WorldModel.cpp

@@ -420,6 +420,9 @@ namespace VMAP
 
     bool WorldModel::IntersectRay(const G3D::Ray &ray, float &distance, bool stopAtFirstHit) const
     {
+        // M2 models are not taken into account for LoS calculation
+        if (Flags & MOD_M2)
+            return false;
         // small M2 workaround, maybe better make separate class with virtual intersection funcs
         // in any case, there's no need to use a bound tree if we only have one submodel
         if (groupModels.size() == 1)