Small writeup on FadeParams shader vectors

Fade Parameters.md

Overview

Returns a packed "FadeParams" vector for a shader. The standard packing format is:

Component	Value
x	near
y	1 / (far - near)
z	(unused)
w	(unused)

Implementation

public static Vector4 GetFadeParams(float near, float far) => new Vector4(near, 1.0F / (far - near), 0.0F, 0.0F);

Usage

In your shader gui, pass a packed vector to Material.SetVector:

var cameraFadeParams = FadeParams(1.0F, 2.0F);
material.SetVector("_CameraFadeParams", cameraFadeParams);

Then, access the vector in the shader. Canonically,

#define CAMERA_NEAR_FADE _CameraFadeParams.x
#define CAMERA_INV_FADE_DISTANCE _CameraFadeParams.y

float cameraFade = saturate((x - CAMERA_NEAR_FADE) * CAMERA_INV_FADE_DISTANCE);

References

• StandardParticlesShaderGUI.cs