GLSL提供简单的水表面效果 [英] GLSL for simple water surface effects

问题描述

我正在寻找一些有关如何在OpenGL ES 2.0中实现简单水面效果的指导.没有什么像反射或折射那样花哨的，只是随时间调制的基本纹波/波效应.性能至关重要.我假设这将是最好在着色器中完成.

I'm looking for some pointers on how to implement simple water surface effects in OpenGL ES 2.0. Nothing fancy like reflection or refraction, just a basic ripple/wave effect that modulates over time. Performance is critical. I'm assuming this will be best done in a shader.

关于如何最好地处理此问题的任何指示?

Any pointers on how to best handle this?

推荐答案

有一个古老的技巧可以模拟水浪&在方程式上使用最小的力就能产生涟漪.它在许多地方都使用过，我找不到原始文件，但是您可以从例如这里.

There is an old trick to simulate water waves & ripples using minimum effort in terms of equations. It's used in many places, and I can't find the original, but you can grab it, for example, from here.

您将需要2个纹理，每个纹理仅包含高度.通过在它们之间进行ping操作来进行仿真(每次都使用一个作为源，第二个作为目的地).

You'll need 2 textures, each containing just height. Simulation is done by ping-ponging between them (using one as a source and second as destination each time).

渲染时，您可能需要从相邻高度导出表面法线.

When rendering, you might need to derive surface normal from the neighbour heights.

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