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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 …

When you change the size of the xna control... the viewport is changed... so you have to recreate your camera projection matrix.. if you are using spritebatch you should recreate it to initialize t …

Try to render the first batch with SpriteSortMode.FrontToBack and DepthStencilState.Default Then render the particles with SpriteSortMode.Deferred, BlendState.Additive and DepthStencilState.DepthRead …

You can use XnaTweener that provides easing functions that interpolate values from one point to another in a easy way... Here is a reply with some code based in the Xna Tweener project and a video sh …

It should be Y=0, if you want to get 2D coords easily, the normal will be Vector3.UnitY If you want to do zoom you should do it by modifying the camera view The Camera.World has not sense, it should be … Normalize(farsourceV - nearsourceV)); var distance = ray.Intersects(plane); if (distance.HasValue) { coords3D = ray.Position + ray.Direction * distance; // if your plane is Y=0, the 2D …

The world Translation affect object in your world, so usually it will be a simple Translation. But if you want scale, rotation, ... is done this way; Matrix World = Matrix.CreateTranslation(-origin,0) …

If you can play your levels, you can make the editor ingame... it is not too difficult.. these are two samples one of my tiled games and its ingame editor 1st version ... http://www.yout …

I'd recommend you to create an specific manager for showing text... To Add a message: MessageSystem.Instance.Show("My string data", Pos, 1); The Class public class MessageSystem { publi …

You need to define a center for rotation... in this case the box center.. then when you detect the mouse down you store vector (A) from the center to the mouse coords... this is your initial vector.. …

The Viewport class has two methods that are very useful for what you want... Viewport.Project and Viewport.UnProject, The UnProject method converts a screen space point into a point in world space, …

Item is a class, the Tile class only stores a reference to it. Your items are static instanced, so you have a few, and the tiles are sharing them... so the name is shared by all the tiles, is the sam …

You need SAT Collision Detection Basically you need to look for the minimum displacement vector that substracted to one of the objects let them to no intersect. In your image the minimum displaceme …