如何从延迟着色中的光几何体的内部绘制 [英] How to draw from the inside of the light geometry in deferred shading

问题描述

我正在尝试使用OpenGL和GLSL实现延迟着色器，并且我遇到了光几何体的麻烦。这些是我采取的步骤：

I'm trying to implement a deferred shader with OpenGL and GLSL and I'm having trouble with the light geometry. These are the steps I'm taking:

Bind multitarget framebuffer
Render color, position, normal and depth
Unbind framebuffer
Enable blend
Disable depth testing
Render every light
Enable depth testing
Disable blend
Render to screen

但是因为我只渲染正面，当我在一个灯光，它完全消失，渲染的背面不工作，因为我会得到双倍的光功率（当在里面，一半[或正常的金额]）。

But since I'm only rendering the front face, when I'm inside a light it disappears completely, rendering the back face does not work, since I would get double the light power (And when inside, half [or the normal amount]).

如何从内部渲染相同的光值和外部的光几何？

How can I render the same light value from inside and outside the light geometry?

推荐答案

如果我记得正确，在我的延迟渲染器只是渲染< >光体积的背面。 缺点是你不能深度测试，你将只知道光计算完成后几何的背后，并丢弃像素。
另一个答案解释，你可以做深度测试。

If i remember correctly, in my deferred renderer i just render only the backfaces of the light volume. The drawback is you cannot depth test, you will only know if a light is behind a geometry after the light calculation is done and discard the pixel. As another answer explained, you can do depth testing. Test for greater or equal to see if the backface is behind or on a geometry, therefore intersects with the surface of the geometry.

或者，您可以检查您是否位于几何图形的内部渲染时光量和切换前面。

Alternatively you could check if you are inside the light volume when rendering and switch front faces accordingly.

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