OpenGL：渲染多于8个灯，怎么样？ [英] OpenGL: Rendering more than 8 lights, how?

问题描述

我应该如何在OpenGL中实现超过8个灯？

我想有效地呈现无限量的灯。

那么，这是什么首选方法呢？

解决方案

延迟着色。

没有任何灯光。相反，将法线和世界位置连同纹理像素一起存储到多个帧缓冲区（所谓的渲染目标）。如果你使用多个渲染目标扩展，你甚至可以在一个单一的通行证。

一旦你准备好你的缓冲区，你开始渲染一堆全屏四边形，每个都有一个像素着色器程序，读取法线和位置并计算一个或多个光源的光。

由于光是相加的，您可以渲染为

最后一步是在灯光和未照亮的纹理之间进行合成帧缓冲区。

这或多或少是最先进的方法。使用这样的系统获得雾和透明度是一个挑战。

How should I implement more than 8 lights in OpenGL?

I would like to render unlimited amounts of lights efficiently.

So, whats the preferred method for doing this?

解决方案

Deferred shading.

In a nutshell you render your scene without any lights. Instead you store the normals and world positions along with the textured pixels into multiple frame-buffers (so called render targets). You can even do this in a single pass if you use a multiple render-target extension.

Once you have your buffers prepared you start to render a bunch of full-screen quads, each with a pixel shader program that reads out the normals and positions and computes the light for one or multiple light-sources.

Since light is additive you can render as much full-screen quads as you want and accumulate the light for as much light-sources as you want.

A final step does a composition between your light and the unlit textured frame-buffer.

That's more or less the state-of-the-art way to do it. Getting fog and transparency working with such a system is a challenge though.

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