Create lightning in OpenGL ES 1.1

Question

I need to create good looking lightning using OpenGL ES 1.1 (iPhone) and was planning on using shaders. However, when I asked about it in a previous question ( OpenGL ES 1.x Shaders ) I was informed there that this was probably not an option on the iPhone.

So now I am back at square one, wondering how I might make a lightning animation. It does not need to look ultra-realistic. I have already tried to use things like triangles stripped together. While this method does work, it is not as good as I had hoped it would look.

Does anyone have any ideas on the subject?

Thanks again,
~Eric

Answer 1

Try using a triangle strip textured with a gradient from black to a low-saturation blue or purple, to white. Set your blending to additive (GL_SRC_ALPHA, GL_ONE).

Answer 2

通常的方法是使用 Perlin 函数计算闪电的路径，将其渲染到发光缓冲区，使用高斯模糊着色器创建漂亮的模糊，然后将其与您的场景合并。

Answer 3

You could maybe adapt the code from this project . Although it's not ObjC/C, it does use OpenGL.

Here is an article that describes the effect in more detail and provides a VB/DirectX implementation.

Answer 4

也许我遗漏了一些东西，但是像其他人一样简单地使用glLight()和固定功能有什么问题？

Answer 5

必须是一盏非常明亮的灯才能使它看起来像闪电，难道您不需要将光照亮或穿过某些东西吗？