achalpandeyy / oceanfft

OpenGL Demo: Simulating Ocean Waves with FFT

OceanFFT

Realistic ocean wave simulation, primarily based on J. Tessendorf's paper, using OpenGL compute shaders. Checkout the demo video here.

In the quest for more realism, a different spectrum is used than the Phillips spectrum mentioned in the original paper. Stockham formulation of FFT is used to better map the problem to the GPU and avoid expensive bit-reversal operation required for the vanilla Cooley-Tukey algorithm.

Build Instructions

1. Clone recursively with submodules via git clone --recurse-submodules git://github.com/achalpandeyy/OceanFFT.git
2. Run CMake in the root directory

Dependencies

Uses my OpenGL framework Ogle as a submodule.

References

• For ocean physics: Fynn-Jorin Flügge's thesis, Jump Trajectory's video for Unity, dli/waves

• For FFT and the math behind it: Eric Bainville's blog, Introduction to the Stockham FFT, 3b1b's video on Fourier Transform, Reducible's video on FFT

oceanfft's Issues

I build it in vs but it can't work

Some debugging techniques

Hello there, I love your Ocean Waves example, I tried compiling it (I did have to change version of OpenGL used from 4.6 to 4.5 in OpenGL shaders) and it compiles and works fine

then I tried to rewrite it in C# with OpenTK and thats where the problems began
as you can see form this picture

nothing is rendered and I have no idea why, I did test all the Shader and Vertex helpers (when I rewrote them) with this example: https://www.mediafire.com/file/jdxfp4z1pgrlvr4/opentk-examples.zip/file

and it works fine there, I get a triangle

But the ocean simulation doesn't show anything, there is only blue sky
Here is the code (for now, no GUI or keyboard handling is implemented, because I first wanted to get the waves to render): https://www.mediafire.com/file/bzivm7wkb3zbvhu/FFT_SIM.zip/file

So sorry to bother you like that but I am not sure what to check (its my first time doing something like this and I learn as I go), compiler gives me no errors, values seam to be the same between c++ and C# implementation, the only difference is that c++ renders waves fine, while C# one only shows the sky. And I am realy confused why that is

So if you could maybe check it or maybe know some additional debugging tehniques in this cases that would be great.

Thanks for Anwsering and Best Regards