Game Development Community

Tricks for collisions and fast moving objects?

by Matthew Hoesterey · in Torque X 2D · 03/16/2009 (9:08 pm) · 1 replies

Hi, I'm having some trouble with a fast moving object that moves through a floor before it detects the collision. My floors need to be really thin (only a few pixels)

I have some ways to cheat (ie draw a rec return all objects in the rectangle find the closest).

I was hoping that a solution already existed in the engine (solve overlap doesn't work as the objects too fast)

I found a TestMove method I was going to experiment with. Does anyone have experience with this method?

Anyone know a solid way to check for these fast moving collisions?

Thanks :)
NextNext Thread
PrevPrevious Thread
More from Torque X 2D


Torque Owner Matthew Hoesterey
#1
03/19/2009 (4:35 pm)
I found a solution. Here is the code for anyone that needs it:

/*  This Method is used to stop fast moving players from going through the ground
         * Searches for a collision along a vector. 
         */
        public Vector2 CheckFastCollision(T2DSceneObject mover, Vector2 offset)
        {
            List<T2DCollisionInfo> collisions = new List<T2DCollisionInfo>();
            T2DSceneObject _collider = TorqueObjectDatabase.Instance.FindObject<T2DSceneObject>("ColliderMovement");
            CharacterDataComponent moverCharData = mover.Components.FindComponent<CharacterDataComponent>();
            float x = mover.Position.X;
            float y = mover.Position.Y;
            _collider.Position = new Vector2(x, y);
            if(moverCharData != null)
                _collider.Size = new Vector2(moverCharData.PhysWidth, _collider.Size.Y);

            Vector2 landPoint = new Vector2(x + offset.X, y + offset.Y);
            Vector2 target = landPoint;
            _collider.Collision.TestMoveTo(ref target, collisions);
            foreach (T2DCollisionInfo tci in collisions)
            {
                if (tci.Position.Y < landPoint.Y && tci.Position.Y > mover.Position.Y)
                {
                    landPoint = new Vector2(x, tci.Position.Y);
                    if (mover.Position.Y + (mover.Physics.VelocityY/10) > landPoint.Y)
                    {
                        mover.Position = new Vector2(mover.Position.X, landPoint.Y - moverCharData.FootOffset);
                        mover.Physics.Velocity = new Vector2(mover.Physics.VelocityX, 0);
                    }
                }
            }
            return landPoint;
        }