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10/13/2009 at 06:23AM PDT, ID: 24807590

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6.8

Correct sliding response with this boundary/collision detection.

Asked by Dr_Spankenstein in Physics & Artificial Intelligence in Game Programming, 3D Game Programming

Tags: Segment Radius Collision Boundary Detection Movement Response

I am currently trying to get a movable object (debug_Polygon[0]) to stay within the confines of a segment by a certain radius.

If I have a segement between two vector points and use the position of the movable object to calculate the distance between the object's position and the segment then I can keep the segement within a certain radius of the segment with the code below.

The problem with the method below is that there is no natural sliding response of the object's movent to the confines of the radius. The object will hit the outer limit and stop moving in that direction.

How can I get the object to slide around the circle created by the radius depending on the direction I press when it reaches the outer limit? This is exactly like the response found when walking into a wall in a FPS and only allowing velocity in any direction other than the opposite of the wall's normal.

Thank you.

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             // Set projected position to current polygon position
            Vector3 position_Projected = debug_Polygon[0].Position;
 
            // Get key presses this frame
            if (InputState.Global.IsKeyDown(Keys.Left))
            {
                position_Projected = debug_Polygon[0].Position + new Vector3(-0.005f, 0, 0);
            }
            if (InputState.Global.IsKeyDown(Keys.Right))
            {
                position_Projected = debug_Polygon[0].Position + new Vector3(0.005f, 0, 0);
            }
            if (InputState.Global.IsKeyDown(Keys.Down))
            {
                position_Projected = debug_Polygon[0].Position + new Vector3(0, -0.005f, 0);
            }
            if (InputState.Global.IsKeyDown(Keys.Up))
            {
                position_Projected = debug_Polygon[0].Position + new Vector3(0, 0.005f, 0);
            }
 
            // Update polygon position with projected position (doesn't change if key isn't pressed)
            if (debug_Segment.SquareDistanceToPoint(position_Projected) <= 2.0f)
            {
                debug_Polygon[0].Position = position_Projected;
            }

           
         

20090824-EE-VQP-74 - Hierarchy / EE_QW_3_20080625

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Correct sliding response with this boundary/collision detection.

Asked by Dr_Spankenstein in Physics & Artificial Intelligence in Game Programming, 3D Game Programming

Tags: Segment Radius Collision Boundary Detection Movement Response

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