Introduction To WP7 Development and Farseer Slides

I've put up the slides from my presentation at Nordic Game Jam 2012. Have fun!

Comments

Anonymous said…
I did a game on farseer for WP7 (Air Soccer Tour) I am doing a multiplayer version (peer to peer basicaly with a non-authoritative server in the middle that is just relaying messages) for it and no matter how synced I try to make it, the game diverges very soon. its a 6meter x 10 meter world with just 7 objects and you can swipe player objects (circles) to kick the ball towards the goal etc. When player 1 swipes one of his strikers, I delay the actual ApplyImpulse by 15 simulations steps and make sure it reaches the other phone so they can both apply the impulse in the SAME simulation step. Still game diverges. I read your article on floating point vs fixed point but will I have to re-code portions of farseer to make it fixed point? Any otehr suggestions?
February 18, 2012 at 12:46 AM
Genbox said…
There will always be a variable delay when working with networking. This can cause a considerable lag if the clients are not synchronized properly.

Have a look at this article:
http://www.flipcode.com/archives/Network_Game_Programming-Issue_07_I_bent_my_Wookie.shtml

The issue it probably not related to the use of floating point numbers, but rather the timing of the impulses. Farseer Physics Engine is deterministic, this means that given the same input in two worlds that are identical, they will behave the same way.
February 18, 2012 at 3:42 PM
Anonymous said…
Will you continue working on Farseer?
March 7, 2012 at 9:35 PM
Genbox said…
Yes, I will continue to work on Farseer whenever I get some spare time.
March 7, 2012 at 9:58 PM
Software media said…
Hello

I’m working on game development magazine – Game Coder Mag Physics – aimed mostly at professionals and those who study to work in the field of game development in the future.

I’m looking for authors for the next issue devoted to collision detection. But if You would like to chose other topic there won't be a problem. Please let me know if you'd be interested in writing an article for the magazine by mail adam.robakiewicz@software.com.pl

Best
Adam Aleksander Robakiewicz
March 15, 2012 at 10:51 AM

Post a Comment

Popular posts from this blog

Optimizing Performance On The Xbox 360 - Part 1

Image
After my Performance Tips and Tricks series I got a lot of requests to write a post regarding the performance on the Xbox 360 platform. I will try to focus on why Xbox 360 is slower than PC and what we can do to get around it. But first we need to underline the importance of good programming. Algorithms and datastructure complexity I’ve been on the topic of complexity before . I can’t underline how important it is that we keep the complexity of our algorithms low. If you are sorting a large dataset, make sure you use the correct algorithm and if you are sorting a small dataset (<10 items), there is another and faster algorithm. Note: If you use .Net List<T>.Sort() , it automatically chooses the best algorithm depending on your dataset. If you are using pixel perfect collision detection, perhaps you should implement a physics system that uses a polygon collision system instead. You could also implement a broad phase system to filter out collisions that you don’t nee...
Read more

.NET Compression Libraries Benchmark

Image
I often find myself needing a compression library in a software development project, and after a few tests with disappointing results I usually fall back to spawning 7Zip as an external process. This time however, the application specification prohibits any data written to disk, which 7Zip needs to do in order to work correctly. I needed to do everything in memory, and so I had to test some of the C# libraries available for compression as well as the different compression algorithms. Here is a full list of the tested libraries: .NET DeflateStream ICSharpCode SharpZip Zlib.NET DotNetZip Managed LZMA LZMA SDK QuickLZ    Compression 101 Before I get to the results of the benchmark, I think it is important to understand the different archive formats and compression algorithms in order to compare the results with other benchmarks/and or tests. Lets get to it! A compression algorithm can be compared to a small machine that takes in some data, do some math on it and...
Read more

Reducing the size of self-contained .NET Core applications

Just for note keeping, I've written down some methods of reducing the size of a .NET Core application. I thought others could use it as well, so here you go. Original Size First off, let's see how much disk space a self-contained 'hello world' application takes up. > dotnet new console > dotnet publish -r win-x86 -c release Size: 53.9 MB -  yuck! Trimming Microsoft has built a tool that finds unused assemblies and removes them from the distribution package. This is much needed since the 'netcoreapp2.0' profile is basically .NET Framework all over again, and it contains a truckload of assemblies our little 'hello world' application don't use. > dotnet new console > dotnet add package Microsoft.Packaging.Tools.Trimming -v 1.1.0-preview1-25818-01 > dotnet publish -r win-x86 -c release /p:TrimUnusedDependencies=true Size: 15.8 MB Much better! Although, we have only removed unused assemblies - what about unused...
Read more