Car and AI problem

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

Hello everyone,
I have just started to make a GTA like game. I am facing a problem: The car body doesn't get aligned with the wheels. Thats when I am approaching a highway the body doesn't rotate perfectly. WHat currently I am doing for body rotation is that I am taking the differrence of the y positions of the spheres and difference of the Z positions, then taking Atan of :

Matrix.CreateRotationX(MathHelper.ToRadians((float)Math.Atan(yDiff / zDiff))); 

 Where yDiff and xDiff are calculated as:

car_punto.yDiff = sphereLeftFront[0].Bounds.Center.Y - sphereLeftFront[1].Bounds.Center.Y;  
car_punto.zDiff = sphereLeftFront[0].Bounds.Center.Z - sphereLeftFront[1].Bounds.Center.Z; 

where sphereLeftFront[0] is the ColliderSphere of the left front wheel and sphereLeftFront[1] is the ColliderSphere of the left rear wheel.
however the car body doesn't rotate perfectly as shown :

6ebc4_carbodyproblem Car and AI problem

What am I doing wrong? Please help.

AI QUES.:

I have just started my work on AI ie how other cars will run on the road. I have set coordinates in an array and for individual car I am checking on which coordinate it has reached keeping a range of about 5 px. For eg. when the other cars reaches a specific coordinate then it will check in the array what to do next. For eg: -1 to turn left and 1 to turn Right 0 to go straight, etc. However I am facing some problems thats sometimes the other cars work well while sometimes they go away straight or continue to revolve on the same place. Is there any other way to implement such kind of stuff???

ALPHA TEXTURE PROBLEM:
Also could anyone please provide some good tutorials about drawing objects with alpha mapped textures like the one used in making trees, railings? The modelling program I am using is 3ds MAX for making trees and assigning textures to them.
Thanks.

Tags:

Rotating a collision rectangle (racing game)

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

Hi, I've looked all over for rotating collision rectangles but I couldn't find anything I could fully understand because the way I am doing collision is different to what i have seen.

How I have made the game is I have rows of tyres that I simply placed
on top of the background and made them each a collision rectangle.

Here's an image of the track and highlighted in red are the collision rectangles.

54505_Untitled-2 Rotating a collision rectangle (racing game)

Below is another image but shows how I think the collision rectangle for the car is reacting to the rotation of the car.

0cae9_Untitled-3 Rotating a collision rectangle (racing game)

I am just clueless at the moment on how I could rotate the collision rectangle alongside the car.

This is the code I have used to set the rectangles and how I move the car. 

protected override void Update(GameTime gameTime)
        {

            //setting rectangles for collision detection
            blueCarRect = new Rectangle((int)blueCarPosition.X - 29, (int)blueCarPosition.Y -61,
                blueCar.Width,
                blueCar.Height);

            v43Rect = new Rectangle((int)v43Position.X, (int)v43Position.Y,
                v43Texture.Width,
                v43Texture.Height);
            v43_2Rect = new Rectangle((int)v43_2Position.X, (int)v43_2Position.Y,
                v43_2Texture.Width,
                v43_2Texture.Height);
            v35Rect = new Rectangle((int)v35Position.X, (int)v35Position.Y,
                v35Texture.Width,
                v35Texture.Height);
            v19Rect = new Rectangle((int)v19Position.X, (int)v19Position.Y,
                v19Texture.Width,
                v19Texture.Height);
            v16Rect = new Rectangle((int)v16Position.X, (int)v16Position.Y,
                v16Texture.Width,
                v16Texture.Height);
            h22Rect = new Rectangle((int)h22Position.X, (int)h22Position.Y,
                h22Texture.Width,
                h22Texture.Height);
            h22_2Rect = new Rectangle((int)h22_2Position.X, (int)h22_2Position.Y,
                h22_2Texture.Width,
                h22_2Texture.Height);
            h11Rect = new Rectangle((int)h11Position.X, (int)h11Position.Y,
                h11Texture.Width,
                h11Texture.Height);
            h11_2Rect = new Rectangle((int)h11_2Position.X, (int)h11_2Position.Y,
                h11_2Texture.Width,
                h11_2Texture.Height);
            h11_3Rect = new Rectangle((int)h11_3Position.X, (int)h11_3Position.Y,
                h11_3Texture.Width,
                h11_3Texture.Height);
            h10Rect = new Rectangle((int)h10Position.X, (int)h10Position.Y,
                h10Texture.Width,
                h10Texture.Height);

            KeyboardState keys = Keyboard.GetState(); // This is making the variable "keys" which purpose will be to get the state of the keyboard inputs 60 times a second.

            //if the up arrow key is pressed and it collides with a tyre barrier then the car speed is reduced to 0.1
            if (keys.IsKeyDown(Keys.Up) && (blueCarRect.Intersects(v43Rect) || (blueCarRect.Intersects(v43_2Rect) ||
               (blueCarRect.Intersects(v35Rect) || (blueCarRect.Intersects(v19Rect) ||
               (blueCarRect.Intersects(v16Rect) || (blueCarRect.Intersects(h22Rect) ||
               (blueCarRect.Intersects(h22_2Rect) || (blueCarRect.Intersects(h11Rect) ||
               (blueCarRect.Intersects(h11_2Rect) || (blueCarRect.Intersects(h11_3Rect) ||
               (blueCarRect.Intersects(h10Rect)))))))))))))
            {
                blueCarSpeed = 0.1f;
            }

            //when no collisions are active while the up arrow is pressed then the car will move at 5
            else if (keys.IsKeyDown(Keys.Up) )
            {
                blueCarSpeed = 5f;
            }

            //if the down arrow key is pressed and it collides with a tyre barrier then the car speed is reduced to -0.1
            if (keys.IsKeyDown(Keys.Down) && (blueCarRect.Intersects(v43Rect) || (blueCarRect.Intersects(v43_2Rect) ||
               (blueCarRect.Intersects(v35Rect) || (blueCarRect.Intersects(v19Rect) ||
               (blueCarRect.Intersects(v16Rect) || (blueCarRect.Intersects(h22Rect) ||
               (blueCarRect.Intersects(h22_2Rect) || (blueCarRect.Intersects(h11Rect) ||
               (blueCarRect.Intersects(h11_2Rect) || (blueCarRect.Intersects(h11_3Rect) ||
               (blueCarRect.Intersects(h10Rect)))))))))))))
            {
                blueCarSpeed = -0.1f;
            }
            //when no collisions are active while the down arrow key is pressed then the car will move at -5
            else if (keys.IsKeyDown(Keys.Down))
            {
                blueCarSpeed = -5f;
            }
            //when the left arrow is pressed then rotate the car anti-clockwise by 5 radians
            if (keys.IsKeyDown(Keys.Left))
            {
                blueCarRotation -= MathHelper.ToRadians(5f);
            }
            //when the right arrow is pressed then rotate the car clockwise by 5 radians
            else if (keys.IsKeyDown(Keys.Right))
            {
                blueCarRotation += MathHelper.ToRadians(5f);

            }
            //mathmatical calculations telling the car which direction to move depending on speed and rotation
            blueCarPosition.X += (float)Math.Sin(blueCarRotation) * blueCarSpeed;
            blueCarPosition.Y += (float)Math.Cos(blueCarRotation) * -blueCarSpeed;
            blueCarSpeed = 0f;

Any help would be appreciated.

Thank you.

Tags:

Collisions

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

Hello eveyone,

I am having some problems on my project about collisions. I have some aparments in my game and my shipmodel now. I want to add some collisions for my model and for buildings. If I go out from my city or try to go through the buildings, I would like to re-start my ship from the beginning.

Any help would be appreciated.
Many Thanks.

I have tried to use something similar to this for prevent the ship going out from the city but it's not working either.

 private void SetUpBoundingBoxes()
 {
     int cityWidth = floorPlan.GetLength(0);
     int cityLength = floorPlan.GetLength(1);        
 

    List<BoundingBox>
bbList = new List<BoundingBox>
();    for (int x = 0; x < cityWidth; x++)
    {
        for (int z = 0; z < cityLength; z++)
        {
            int buildingType = floorPlan[x, z];
            if (buildingType != 0)
            {
                int buildingHeight = buildingHeights[buildingType];
                Vector3[] buildingPoints = new Vector3[2];
                buildingPoints[0] = new Vector3(x, 0, -z);
                buildingPoints[1] = new Vector3(x + 1, buildingHeight, -z - 1);
                BoundingBox buildingBox = BoundingBox.CreateFromPoints(buildingPoints);
                bbList.Add(buildingBox);
            }
        }
    }            
    buildingBoundingBoxes= bbList.ToArray();
}

Tags:

Help with Pong

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

 I have a quick question say for something like pong if have a class paddle

    class Paddle 
    { 
        ContentManager mContentManager; 
 
       public Texture2D texture; 
 
       public static Vector2 PaddlePosition; 
 
       public Vector2 Center; 
 
       public Rectangle Rectangle; 
 
       public float Speed; 
 
        
 
 
       public void LoadContent(ContentManager theContentManager) 
       { 
           mContentManager = theContentManager; 
 
           texture = theContentManager.Load<Texture2D>("paddle"); 
            
           PaddlePosition = new Vector2(300, 300); 
 
           Center = new Vector2(texture.Width / 2, texture.Height / 2); 
 
           Rectangle = new Rectangle((int)PaddlePosition.X, (int)PaddlePosition.Y, texture.Width, texture.Height); 
 
           Speed = 5.0f; 
       } 
 
       public void Update(GameTime gameTime) 
       { 
           GamePadState Pad1 = GamePad.GetState(PlayerIndex.One); 
 
           KeyboardState KeyBoard1 = Keyboard.GetState(); 
 
            
 
           if (KeyBoard1.IsKeyDown(Keys.Left)) 
           { 
               PaddlePosition.X += Speed; 
           } 
 
           if (KeyBoard1.IsKeyDown(Keys.Right)) 
           { 
               PaddlePosition.X -= Speed; 
           } 
 
           Rectangle = new Rectangle((int)PaddlePosition.X, (int)PaddlePosition.Y, texture.Width, texture.Height); 
 
       } 
 
       public void Draw(SpriteBatch spriteBatch) 
       { 
           spriteBatch.Draw(texture, PaddlePosition, null, Color.White, 0f, Center, 1.0f, SpriteEffects.None, 0); 
       } 
 
 
    } 
} 
 

now say i have a class for the ball now also like paddle and i want the ball when it goes off the screen to appear at the paddles position so do i make the paddle position static and say if the ball leaves the screen ballPosition = Paddle.paddleposition;

Tags:

Car and AI problem

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

Hello everyone,
I have just started to make a GTA like game. I am facing a problem: The car body doesn't get aligned with the wheels. Thats when I am approaching a highway the body doesn't rotate perfectly. WHat currently I am doing for body rotation is that I am taking the differrence of the y positions of the spheres and difference of the Z positions, then taking Atan of :

Matrix.CreateRotationX(MathHelper.ToRadians((float)Math.Atan(yDiff / zDiff))); 

 Where yDiff and xDiff are calculated as:

car_punto.yDiff = sphereLeftFront[0].Bounds.Center.Y - sphereLeftFront[1].Bounds.Center.Y;  
car_punto.zDiff = sphereLeftFront[0].Bounds.Center.Z - sphereLeftFront[1].Bounds.Center.Z; 

where sphereLeftFront[0] is the ColliderSphere of the left front wheel and sphereLeftFront[1] is the ColliderSphere of the left rear wheel.
however the car body doesn't rotate perfectly as shown :

c5363_carbodyproblem Car and AI problem

What am I doing wrong? Please help.

AI QUES.:

I have just started my work on AI ie how other cars will run on the road. I have set coordinates in an array and for individual car I am checking on which coordinate it has reached keeping a range of about 5 px. For eg. when the other cars reaches a specific coordinate then it will check in the array what to do next. For eg: -1 to turn left and 1 to turn Right 0 to go straight, etc. However I am facing some problems thats sometimes the other cars work well while sometimes they go away straight or continue to revolve on the same place. Is there any other way to implement such kind of stuff???

ALPHA TEXTURE PROBLEM:
Also could anyone please provide some good tutorials about drawing objects with alpha mapped textures like the one used in making trees, railings? The modelling program I am using is 3ds MAX for making trees and assigning textures to them.
Thanks.

Tags:

CodePlex Daily Summary for Wednesday, December 30, 2009

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

CodePlex Daily Summary for Wednesday, December 30, 2009

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CodePlex Daily Summary for Tuesday, December 29, 2009

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

CodePlex Daily Summary for Tuesday, December 29, 2009

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CodePlex Daily Summary for Monday, December 28, 2009

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

CodePlex Daily Summary for Monday, December 28, 2009

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CodePlex Daily Summary for Sunday, December 27, 2009

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

CodePlex Daily Summary for Sunday, December 27, 2009

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CodePlex Daily Summary for Saturday, December 26, 2009

December 31, 2009 by admin · Comment
Filed under: Xbox360 News 

CodePlex Daily Summary for Saturday, December 26, 2009

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