quote: What is the reason so many people chose OpenGL...

Well....... to put it simply... OpenGL is easy to learn ( hence most people .. not all.. learn it as their first graphics API ).
Its capable of doing pretty much everything DX can, and there arent really any downsides to it.

DirectX has its own benefits, but a lot of people who started on OpenGL find the transition from OpenGL to DirectX a little daunting, so they tend to stick to OpenGL and defend it violently hehe.

Thats my view anyway.. Think that was a fairly unbiased answer to his first question.

quote: Whats the bad side of D3D

I cant answer that.... im one of those people who just use it for streaming stuff.

....................

The only thing I use DirectX for nowadays is streaming in movie/mp3 media. For everything else... OpenGL suits me just fine

~Cobra~