OpenGL or Direct3D for a new Windows game project? Or something else?

Question

I'm starting a hobby game project on Windows that will make heavy use of 3D graphics effects. It will most likely be written in C++. Should I use OpenGL or Direct3D for my graphics backend? Why? Or should I use a ready-made graphics engine such as OGRE 3D? Which one? Some "how to get started" links would be useful. (On either technology, or both.) Edit - Yes I really meant Direct3D, not DirectX, thanks to graham.reeds for clarification Edit - Mihai Lazar pointed out that I could also use a graphics engine such OGRE 3D. Edited the question to reflect this alternative. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Start with OpenGL because there are good textbooks and other online references on it. Once you get the hang of writing 3D game, you would be able to make the judgment for yourself. Finishing a game, even if it's really stupid and simple just to get you going, is more important than picking the right library. With glut, you can get some 3D object to show up on your screen in a day. Start with NeHe's tutorials.