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That is explained here by Shawn Hargreaves, the Xna lead coder https://shawnhargreaves.com/blog/spritebatch-and-custom-shaders-in-xna-game-studio-4-0.html …

1) You don't need to calculate the visible objects in a single frame, you may use a bit bigger viewport, and calcultate only 500 objects per frame, if you have 20000 objects and your framerate is 50f …

Pixel color addresing is bad, it will work on a square but not on a rectangle. Change this: colors[ x * texture.Width + y ] = borderColor; colors[ x * texture.Height + y ] = Color.Transparent; T …

If you have the rotation matrix, I think the the easier is to get the cos between the normals and forget the vertex position. The cos will be max and near 1 when the angle among the two vectors is ne …

http://romsteady.blogspot.com.es/2011/07/use-zip-files-to-hold-your-xna-content.html public class ZipContentManager : ContentManager { private ZipFile zipFile = null; public ZipContentManager(IServiceProvider …

The X position of the background have to be calculated with the X position of the player and a speed factor. Texture2D ParallaxTex; Rectangle ParallaxBounds = graphics.Viewport.Bounds; spriteBatc …

I think should do the trick: ScaleX = vp.X / gameWorldSize.X; ScaleY = vp.Y / gameWorldSize.Y; Scale = Math.Min(ScaleX, ScaleY); camera = Matrix.CreateTranslation(-Player.Position) * Matrix. …

You should determine what side of the rectangle is colliding with the ball, and get the normal N of that side. If the ball movement vector is V, then the reflected vector is: var reflected = Vector …

1) Figuring out mouse position: I think is easier using a Ray/Plane intersection. Seems that your plane is Y=0, then the code is: nearsourceV = graphicsDevice.Viewport.Unproject(new Vector3(mouse. …

Change the sampler state to Point clamp or wrap before drawing. GraphicsDevice.SamplerStates[0] = SamplerState.PointClamp;

But seems easy to code a standalone application to manage it, you need to use a FileSystemWatcher, built it again with a tool like the Xna 4.0 content compiler, or made by yourself (see Winform series … This is the link to the Xna 4.0 to the Content Tracker project …

You should first scale and rotate, and then translate: Vector3 objPos = new Vector3(0, -50, 0); Vector3 camPos = objPos - Vector3.One * cameraDistance; Matrix view = …

The problem is that the bounding box has the same Z in Max and Min, so there is no volume. Changing this: box = new BoundingBox( new Vector3(box.Position, 0), new Vector3( new Vector2(box. …

You can do it in a similar way to keyboard, storing the state by yourself: enum States {None, GoingDown, GoingUp } States Current, Previous; void Update() { Previous = Curren …

You are drawing all sprites in the same postition and same size, if textures don't have alpha channel you will only see one of them. Test this to draw a grid with 8 columns: var size = 100; …