(3.3.5) TraceLine causes WoW to hang... need help!

[haku43]

TraceLine sometimes causes a hang, with no error or exception.
Edit: I also noticed that calling this function sometimes causes the character to fall through WMO's...

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate byte TracelineDelegate(ref Common.Vector end, ref Common.Vector start, ref Common.Vector result, ref float distance, uint flags, uint Optional);
        public static TracelineDelegate WoWTraceLine;

    [Flags]
    public enum CGWorldFrameHitFlags : uint
    {
        HitTestNothing = 0x0,
        /// <summary>
        /// Models' bounding, ie. where you can't walk on a model. (Trees, smaller structures etc.)
        /// </summary>
        HitTestBoundingModels = 0x1,
        /// <summary>
        /// Structures like big buildings, Orgrimmar etc.
        /// </summary>
        HitTestWMO = 0x10,
        /// <summary>
        /// Used in ClickTerrain.
        /// </summary>
        HitTestUnknown = 0x40,
        /// <summary>
        /// The terrain.
        /// </summary>
        HitTestGround = 0x100,
        /// <summary>
        /// Tested on water - should work on lava and other liquid as well.
        /// </summary>
        HitTestLiquid = 0x10000,
        /// <summary>
        /// This flag works for liquid as well, but it also works for something else that I don't know (this hit while the liquid flag didn't hit) - called constantly by WoW.
        /// </summary>
        HitTestUnknown2 = 0x20000,
        /// <summary>
        /// Hits on movable objects - tested on UC elevator doors.
        /// </summary>
        HitTestMovableObjects = 0x100000,

        HitTestLOS = HitTestBoundingModels | HitTestWMO, //| HitTestMovableObjects | HitTestUnknown2,
        //HitTestLand = HitTestGround | HitTestWMO, //| HitTestMovableObjects | HitTestUnknown2,
        HitTestGroundAndStructures = HitTestLOS | HitTestGround

    }
    [Serializable]
    public struct Vector
    {
        [XmlAttribute("x")]
        public float X;

        [XmlAttribute("y")]
        public float Y;

        [XmlAttribute("z")]
        public float Z;

    }

 public bool HitTestLOS(Common.Vector end, Common.Vector start)
        {
            byte result = 0;

            //try
            //{
            Common.Vector res = new Common.Vector();
            float dist = 1.0f;
            uint zero = 0;
            result = FunctionInterface.WoWTraceLine(ref end, ref  start, ref res, ref dist, (uint)Common.CGWorldFrameHitFlags.HitTestLOS, zero);

            //}
            //catch (Exception ex)
            //{
            //    LuaInterface.LoggingInterface.LogEx(ex.Message);
            //}

            return (result == 0);
        }

Any thoughts?

[MaiN]

You're probably using the wrong offset. Also, you have start and end switched around.

[haku43]

I've managed to get it working, but it usualy takes 5 - 15 ms to complete, which is kinda slow. (Calling it from endscene).

[Jadd]

Also, you have start and end switched around.

Why would this matter?

[namreeb]

Why would this matter?

Wont swapping start/end give you the intersection point furthest from the actual start?

[MaiN]

Why would this matter?

Wont swapping start/end give you the intersection point furthest from the actual start?

What namreeb said.

EDIT: It also matters if they take culling into account. For instance, when you right/left click in the game world a raycast is performed, and you want that ray to hit what the user clicks, not some invisible triangle the graphics card has culled away.