One month, sure :D Realistically, if you have no GPU or OpenGL experience, to build something like that, lightning, shadows.. And to really understand what is h

One month, sure :D Realistically, if you have no GPU or OpenGL experience, to build something like that, lightning, shadows.. And to really understand what is happening, in one month maybe if already know C++/your language of choice well, you can grasb the idea of how to draw a triangle with maybe some lightning. Shadows, animation, no way in a month. The whole OpenGL stack is pretty complex. My suggestion would be the same though, but maybe reserve one year to really just grind the basics until you have a clear understanding of what is happening. On the other hand, if you just want CUDA, there are frameworks for that for enabling parallel calculations without having to understand graphics programming.