XNA Game Studio 4.0 is a programming environment that allows you to use Visual Studio to create games for Windows Phone, the Xbox 360 console, and Windows-based computers.

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xna 2.5d gravity system

i currently developing a game using the xna API. now the game i am developing is 2.5d. by 2.5d i mean the character or object can move left and right and a up and down(not just by jumping) that it ...
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190 views

How can I create my own GameTime for timing things in my game?

I have a Game class and a GameComponent class. I want to perform operations inside the GameComponent class which depend on calling gameTime.ElapsedGameTime.TotalSeconds, but I've noticed that that ...
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163 views

map the section of a procedurally generated surface on a plane

I'll try to be as clearer as I can. I have a surface on a 3D space which is not flat, it has hills and depths. My goal would be intersect it with a plane so that I can map the section of the surface ...
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0answers
178 views

Using obj file in an XNA game [closed]

Sorry if this is a bit novice but I am far more into engineering than game development but I just want to make a small 3D game for fun with XNA (well actually MonoGame). The thing is that I don't have ...
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1answer
89 views

Height map renders upside down and/or backwards

After following the tutorial found here:http://www.riemers.net/eng/Tutorials/XNA/Csharp/Series1/VertexBuffer_and_IndexBuffer.php The code at the bottom of this page is what I am using. (I have ...
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2answers
102 views

margin of error trying to check if a point lays on line

Working with floating point values it is as easy as breathing to run on approximation errors by comparing quantities which should be the same. I want to know if there is a way built in some MSDN (or ...
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1answer
451 views

How can I draw a perspective-correct quad?

I'm trying to draw a quad in 2D (in SharpDX, but that is basically XNA). But texture correction is not working, and I'm getting only an affine textured quad. I'm using BasicEffect to render it. ...
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2answers
105 views

Where does the Game class come from in the DrawableGameComponent constructor?

I'm making a project to Windows Phone using Silverlight + XNA, but I don't know how I can use the DrawableGameComponent because the constructor requires a Game class, it looks like this: Planet.cs ...
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3answers
166 views

Why I am I told “Color0 is missing” when I run the following code?

In the code below, I want to draw a box on my screen. But when I run it, there is an error message: The current vertex declaration does not include all the elements required by the current ...
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1answer
95 views

Why doesn't my XNA model render at all? [closed]

I am trying to draw a 3D Model in XNA 4.0, but it doesn't show up. I think I made it correctly, but maybe not. My code follows: Here is the LoadContent and Draw method of my Main class. Spaceship is ...
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1answer
110 views

How do I check if a surface is sloping?

I'm implementing gravity over a 3D terrain and I'm struggling with how to check if surface "under your feet" is flat or sloping. I read some tutorials but gravity is always considered along a single ...
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2answers
306 views

Add a “fake” Loading Screen

I'm working on a 2D game for WPF8 using XNA 4.0. Everything goes great, but it's too fast. I was just wondering, what could I do between the end of the game and the score screen, and before the game ...
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131 views

Where does XNA 4.0 takes memory from to perform operations?

I found this question which talks around the question I'm interested in. In particular I focused on the line where the guys says that GraphicsDevice object is literally a representation of the ...
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1answer
118 views

XNA DepthBias increases performance even when EarlyZ is turned off. Why?

My 3d scene consists of three main polygons: The first and the second polygons overlap each other (have the same World matrix and use the same geometry), the third one is perpendicular to the first ...
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1answer
180 views

How should I attenuate sound in a 2D game where you can zoom in and out?

In my 2D game, I have some ambient sounds like the noise of a waterfall or the humming of a generator. However, it is not practical to play these sound all the time at full volume as in a large level ...
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1answer
378 views

Rope Colliding with a Rectangle

I have my rope, and I have my rectangles. The rope is similar to the implementation found here: http://nehe.gamedev.net/tutorial/rope_physics/17006/ Now, I want to make the rope properly collide ...
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1answer
451 views

Get screen bounds of 3D object

I'm trying to draw a 2D plane that has minimum dimensions to contain a 3D model (a sphere). How do I calculate the minimum size and position of the rectangle to completely cover a 3D model on screen?
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2answers
1k views

What are some ways to texture map a terrain?

I'm working with XNA on a 3D Game, and I'm trying to have a proper and nice environnement. I actually followed a tutorial to create a terrain from a heightmap. To texture it, I just apply a grass ...
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91 views

Avoiding lag when rendering Texture2D for first time

I have found a similar question here, but it is about playing sounds. I am using 2048 x 2048 textures for sprite sheets and every time I call spriteBatch.Draw using a sheet for the first time in game ...
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1answer
136 views

What's the difference between Textures and VertexTextures in XNA?

The GraphicsDevice class of XNA has the properties Textures and VertexTextures. What is the exact difference? I don't really understand what MSDN tells me about this. I usually use Effect parameters ...
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1answer
226 views

Obtain rectangle indicating 2D world space camera can see

I have a 2D tile based game in XNA, with a moveable camera that can scroll around and zoom. I'm trying to obtain a rectangle which indicates the area, in world space, that my camera is looking at, so ...
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4answers
746 views

The physics equation for a perpetual seesaw

I am trying to create a game that involves two or more people jumping on a seesaw and propelling each other in the air. I need help with the physics equations Assume no friction and no air ...
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1answer
181 views

Changing enum in a different class for screen

I'm trying to make a start menu for my game and my code uses Enum's to moniter the screen state. Now i want to change the screenstate declared in the main class, in my Background class Screen screen ...
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1answer
2k views

How do I make a health bar that drains when the player takes damage? C#/XNA

I've drawn a Health Bar before and had it drain/refill on a button press using if statements and rectangles. First I loaded the image, then I set a new rectangle to be equal to the image's height and ...
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1answer
406 views

XNA - Where should I start playing a song?

I am just wondering where is the best place to start playing the background song for a game. In the loadContent() method, Draw(), or Update() methods or when I initialize it? I am trying to make it ...
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2answers
185 views

Collide with rotation of the object

I'm developing a mirror for lazer beam(Ball sprite). There I'm trying to redirect the laze beam according to the ration degree of the mirror(Rectangle). How can I collide the ball to the correct angle ...
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1answer
97 views

Why am I getting a return value of zero from my position computation function?

Ok I have a Function int x(), which is used in new Rectangle(x(),a,a,a); in DrawMethod in XNA but when I use it I get x() = 0 as as the answer.Here is my CODE: int x() { int px ...
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1answer
805 views

Parallax scrolling with 2D camera [duplicate]

I'm developing a 2D Platform game, I have a 2D camera, some backgrounds, and everything is working good. Now I want to implement parallax scrolling to give the illusion of depth in my game, but i ...
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1answer
347 views

XNA Arcball and moving model - the model is altered instead of the camera

I'm trying to implement an arcball type camera, I've got all controls working very nicely. I can rotate the X/Y axis with my mouse and zoom in and out with the Z/X keys. The problem is, that the ...
2
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1answer
475 views

Resize texture in code

I need to change texture size from for example 800x600 to 80x60. I have two ideas of how to do that, but i have problems with both approaches. 1) changre render target then draw and save resized. the ...
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1answer
333 views

render sprites with a transparent background (XNA)

For my game I want to make a map of the world. Per country I made a file with the border of the country and the rest of background is transparent. This way all my files have the same width and height. ...
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1answer
70 views

How can I animate the stretching of a sprite over time?

My goal is to find the function to stretch a sprite like my example below, and then get it to animate during a certain time. It is like an interpolation, where the starting point is the original ...
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1answer
119 views

What does Rectangle.Intersect means/do?

Ok I have two rectangles one is the ball and other is the paddle. 1. if(ball.rectangle.intersects(paddle.rectangle)) y = -Math.Abs(y); and 2. ...
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1answer
1k views

How to use elapsed game time for timing

I want that my ship shoots beam after every 2 seconds. How do I make that happen? and also I want that after 50 shots I want to give 10 seconds to reload the gun. I know both of my problems can be ...
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1answer
63 views

Shared Texture2D in XNA

I am trying to define texture2d objects as shared. The reason of why I am trying to do is, I made an xna user control and my project loads unlimited (as much as the user wants) my XNA User Control. ...
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1answer
204 views

Texture2D can't find my sprite - how to setup the content directory in XNA

So I keep getting told that spr_lives can't be found. I'm working out of a book and using the samples given to me (have not changed the code or folder structure, so it /should/ work) but nothing's ...
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0answers
309 views

Monogame working with Krypton

I am trying to make a simple 2D game engine using Monogame and the Krypton 2.0 lighting engine. So far I have succeeded in rendering a light but I am unable to generate any shadows from any hull's. ...
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1answer
212 views

Collision Issues

When I run the collision code, there are no errors, but when I shoot the enemy nothing happens..... Any problems that are blindingly obvious? Class Level Variables public Model model { get; ...
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1answer
276 views

First person shooter camera movement

I am making an FPS in XNA. I cannot seem to make a FPS camera that I can move Forward, Back, Side to Side using the keyboard. How do I do that?
2
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1answer
85 views

What is the best way to follow this book using XNA 4.0 instead of XNA 2.0

I found a reference to this book on the Microsofot Indie games forums: http://www.amazon.com/dp/1430209798/ref=pe_385040_30332200_pe_309540_26725410_item I'm really interested in it, because the ...
0
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1answer
435 views

C# XNA4 2D Collision Detection

I am working on a 2D engine in Xna and am running in a bit of trouble with Collision implementation. What I want to do is have an interface ICollidable that I can add to GameObjects that are ...
7
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2answers
313 views

Where to put Entity Death Events in a Component/System Design

Entities in my game are nothing more than a collection of components, tied together with an entityID. I have (near) data-only components, and systems that work on the data. One of these components is ...
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1answer
205 views

Using a Vertex Buffer and DrawUserIndexedPrimitives?

Let's say I have a large but static world and only a single moving object on said world. To increase performance I wish to use a vertex and index buffer for the static part of the world. I set them ...
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1answer
154 views

How to control in the vertex shader where pixel ends up in the renderTarget?

What if I have an arbitrary renderTarget, that is smaller than the screen (say it is 1x1 pixel) and I want to make sure in the VertexShaderFunction that all my pixels end up exactly in that 1 pixel ...
2
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3answers
167 views

Should Draw method calculate the element's screen location?

Should Update take care of calculating the drawing position of element or should it be done exlusively in Draw method? If I calculate the drawing position of element in Update and then store it as ...
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111 views

DepthStencilState System.ObjectDisposedException [closed]

I developed a Windows Phone 7 & 8 game and released it already. Having integrated BugSense, I received a handful of errors mainly from specific versions of Windows Phone 8 OS (mainly ...
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1answer
477 views

How do I generate a mipmap for a texture loaded from a stream?

I am loading a Texture2d from a stream: public static Texture2D GetTexture(GraphicsDevice dev, System.Drawing.Bitmap bmp) { Texture2D texture; using (MemoryStream s = new MemoryStream()) ...
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417 views

XNA 4.0 Pixel Shader 3.0 Exact Texture Lookup/Sample Issue

I am stuck on trying to solve this problem. I originally had some shaders written that worked for XNA 3.1, but after converting to XNA 4.0 they would no longer compile due to instruction counts, flow ...
2
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1answer
280 views

XNA Framework Reach profile does not support separate alpha blend

Yesterday I released my app 'Pic Words' to the windows phone store. It is an Silverlight/XNA app that runs on Windows Phone 7.1 & 8. I have BugSense incorporated into my app. Today I started ...
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2answers
592 views

XNA 3.1 to 4.0 Vertex Shader Not Drawing [closed]

I have recently been converting our XNA 3.1 game to XNA 4.0 and am stuck on the shaders. I have the game running, but nothing is drawing to the screen, except things not using a shader. This is only ...