Attention: Here be dragons

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自定义后期处理

前言

Godot provides many post-processing effects out of the box, including Bloom, DOF, and SSAO, which are described in 环境和后期处理. However, advanced use cases may require custom effects. This article explains how to write your own custom effects.

实现自定义后期处理着色器的最简单方法是使用Godot的内置功能从屏幕纹理中读取. 如果你不熟悉这个, 你应该先阅读 屏幕阅读着色器教程 .

单阶段后期处理

Post-processing effects are shaders applied to a frame after Godot has rendered it. To apply a shader to a frame, create a CanvasLayer, and give it a ColorRect. Assign a new ShaderMaterial to the newly created ColorRect, and set the ColorRect's layout to "Full Rect".

Your scene tree will look something like this:

备注

Another more efficient method is to use a BackBufferCopy to copy a region of the screen to a buffer and to access it in a shader script through a sampler2D using hint_screen_texture.

备注

As of the time of writing, Godot does not support rendering to multiple buffers at the same time. Your post-processing shader will not have access to other render passes and buffers not exposed by Godot (such as depth or normal/roughness). You only have access to the rendered frame and buffers exposed by Godot as samplers.

这个演示中，我们使用的是这张小羊的