i need to create a 2d-raster. how can i make this at the easiest way?
2d-raster of what? OpenGL can render 2d graphics, but it's impossible to give any advice without knowing what you are trying to achieve.
Check out the example browser that was installed along with OpenTK (it's in the start menu). There are a couple of 2d examples, for instance OpenGL -> Display Lists and Texture Mapping.
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