nKast

coding for fun

5. February 2014 03:20
by nKast
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CPU Skinning: ARM-NEON

5. February 2014 03:20 by nKast | 0 Comments

 One of the nice things about Windows Phone 7 was the experimental support for ARM-NEON instructions. What it did, was generate NEON instructions for XNA's build in vector classes. It greatly improved performance on things like Physics, Particles, Geometry generation,etc. I used this from the v... [More]

2. February 2014 01:13
by nKast
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CPU Skinning: Better Loading times

2. February 2014 01:13 by nKast | 0 Comments

One of the issues I had to resolve during the development of our next game was slow loading times on WP8. After some investigation I figure that about half of the time was spent on loading models with skinning information. I use the code from the CPU Skinning sample. The sample demonstrat... [More]

24. November 2012 07:21
by nKast
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Stencil Ball Shadows for XNA / WP7

24. November 2012 07:21 by nKast | 0 Comments

    In the early versions of The Juggler, the first pinball game for WP7, the ball had no shadow. Later we added a shadow by using a very simple trick, a transparent texture was drawn on the table right below the ball.  I have seen this on many games; it's not heavy on the GPU and gi... [More]

29. October 2012 03:06
by nKast
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Motion API for XNA AR camera

29. October 2012 03:06 by nKast | 0 Comments

One of the coolest things you can do on mobile phones are Augmented reality apps. Combining the camera with the Motion API of windows phone is all you need. So, here's what you need to make AR on XNA. First, Initialize the Motion APIHere I also set the update interval to 60FPS   motion =... [More]

19. September 2010 11:52
by nKast
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AccelKit, an Augmented Reality Accelerometer Kit for Windows Phone 7 Emulator

19. September 2010 11:52 by nKast | 1 Comments

 AccelKit is an Augmented reality tool that simulates an accelerometer sensor for those who develop applications for the upcoming Windows Phone 7.I used ARToolKit, an open source AR library that can track the position & orientation of a marker moving in front of a webcam.  Those data a... [More]