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The projection matrix defines a viewing volume. Any geometry outside of this volume will be clipped. Your geometry is clipped because it is not between the near and far planes of the volume defined by the Orthographic projection. The geometry z coordinate is 0, but the distance to the near plane is 0.1 and the distance to the far plane is 100.

Either change the z coordinate of the geometry and move the geometry along the negative z axis:

offset = new Vector3(10, 10, 0);

You should first call base.OnResize and then update the viewport size, you don't need to override OnMaximized:

There are a couple of different ways to structure shader files, each with different pros and cons.

• As individual programs. You make each file it's own shader program. Simple to add new programs, and would allow your users to just write a program in GLSL, HLSL, or an engines custom shader language. You will have to provide some way for the user to express what kind of data the program expects, unless you query it from the engine, but it might get complicated to make something that's generic enough.

• Über Shader! Put all desired functionality in one shader and let the behavior be controlled by control flow or preprocessor macros, such as #ifdef. So the user would just have to write the main function (which the application adds to the rest of the shader). This allows you to let the user use all the predefined variables and functions. The obvious downside is that it could be big and hard to handle and small changes might break many shaders.

• Micro Shaders. Each program contains a small, common functionality, and the application concatenate them all to a functioning shader. The user just write the main function and tells the program which functionality to add. The problem is that it's easy to get conflicts in names unless you're careful and is harder to implement than the über shader.

• Effect files. Provided by Microsoft’s effect framework or NVIDIA’s CgFX framework (deprecated).

• Abstract Shade Trees. Don't actually know what this is, but it's suppose to be a solution.

You can also combine some of these techniques or try to invent your own solution based on your needs. Here's the solutions discussed (in sector 2.3.3 Existing Solutions).