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I've built a Windows Phone 7 app that uses the WriteableBitmapEx library and lets the user draw on the WriteableBitmap surface. The app supports multi touch for drawing and the radius of the pen can be changed with the Slider control. An image from the phone's picture library can be chosen with the folder icon button and the floppy disk button saves the current image to the picture library. When the third button (download icon) is clicked, all pictures from the phone's library are loaded without further user interaction. The trash button clears the draw surface. 

We're slowly getting to the first feature complete release of the WriteableBitmapEx library. The last version (0.9.0.0) brought the parametric curves, optimizations and other features. This new version 0.9.5.0 focuses on filling routines, transformations, bug fixes and more optimizations.

The new Fill* extension methods are equivalent to the Draw* shape functions. The FillRectangle and FillEllipse methods use specialized implementations to get the best performance. FillPolygon and the other functions use a simple scanline conversion algorithm with the even-odd-rule. The implemented algorithm supports concave and convex shapes.

Most of the functionality I implemented in Matrix3DEx was originally required for another open source project I'm currently working on (hint, hint), and as you might know I also like to extend Silverlight's graphics functionality in a reusable manner. That's why I decided to extract the Matrix3D code into a separate open source project, add some more useful methods, document it and write a sample.

In the Silverlight 4 Augmented Reality Proof Of Concept blog post I proved that it's possible to implement Augmented Reality applications with Silverlight 4 and the built-in webcam API. The proof of concept used an image showing a Silverlight logo that was attached to the tracked marker. With this blog post I'm back in this field, but this time with real 3D Augmented Reality in Silverlight!

René Schulte explains in detail pixel shaders and the implementation of edge detection post processing effect.

Silverlight pixel shaders could be written in HLSL and compiled with the DirectX shader compiler fxc. The produced binary file is then loaded with the Silverlight 3 PixelShader class. Quite easy huh? I must admit that I'm not a complete newbie to shader development. I even wrote some shaders with Shader Model 1.1 in the assembler shading language a few years ago, but haven't done it a while.
For Silverlight 3 I've implemented an edge detection post processing effect. It's a parametric pixel shader, which performs a common image processing technique called convolution.

René Schulte has posted his Silverlight 2 implementation of a three dimensional improved Perlin Noise algorithm.

Perlin Noise could produce pseudo-random semi-natural textures with fractal characteristics and is mostly used for procedural image generation. The algorithm can be controlled with various parameters and is able to produce good looking cloud / sky, fire, smoke, wood or marble textures and height maps, just to name a few.