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Introduction To Replacement Shaders & Shader Keywords

What is a replacement shader? A replacement shader is a shader that gets applied to every object being rendered.
Since the camera determines what objects end up being shown on screen, The functionality for setting up replacement shaders are in the camera class as well.

A good use case of a replacement shader would be in making effects like SSAO.
Here we need access to the normals and the depth information so a replacement shader that displays only the normals can be rendered ( stored in a render texture ) and then another shader that displays the depth information ( stored in a render texture ) and then the final image is rendered with the SSAO effect by taking the two render textures as input and doing a bunch of calculations.

Another use case would be to visualize the environment differently for various reasons like how they did in City Skylines.

The function that performs shader replacement is:
Camera.SetReplacementShader( Shader shader, string replacementTag ) Takes in a shader as …

Tri-Planar Terrain Shader

How The Tri-Planar Terrain Shader Looks Like Apart from the manually drawn tile footpath the cliff walls and grass has been generated through a tri-planar shader. How The Tri-Planar Terrain Shader Works The shader that we make will work with the existing terrain system and no need for any custom scripts.
The first two textures provided in the terrain settings will be used to texture the terrain :
*Notes:-
First Texture Index:- Texture that appears on cliff sides.Second Texture Index:- Texture that appears on flat surfaces.Any subsequent textures can be used to draw on top of this as usual.Drawing with either first or second texture slot acts as a eraser removing subsequent textures Terrain Shader Tutorial The shader we will make will be working on top the existing terrain shader that Unity provides us.  So that will require accessing the Unity shader repository for your specific version of Unity.
The version of Unity I used to create the shader is version 2017.4.
Most likely there won&…

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