I want to make a simulation of water drops producing waves, in OpenGL with C++. I calculated the height for each point of my plane grid in the 'Vertex Shader' with this formula:
The problem is that I don't know how to generate the waves so they gradually advance.
This is what my waves look like:
I want to have one circle at the beginning instead of all of them. The first circle should get bigger, like in the photo.
How do I do this?
See that t there towards the end?
That represents time. Replace it with the system clock time in milliseconds, adjust Phi as necessary (so that the waves move at the desired rate: larger phi value means they'll move more quickly, smaller phi and they've move more slowly, negative and they're converge rather than diverge), and you're done.
You probably want to do something like a physics simulation of the water surface. If you break the surface up into smaller polygons and connect neighboring polys by virtual springs, you can move one in the center and that movement should propagate over time. Here is an interesting example with links to papers on how it works.
