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## Shaders.md

      
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                zensharp
                / Shaders.md
            
            
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              February 7, 2023 17:40
            
              
                Shader Snippets
              
          
    CG Syntax

Declare constant

static const float PI = 3.14;

Declare constant expression

#define INV_FADE_DISTANCE 1.0 / (_FarFade - _NearFade)


## TryGetSecant.cs

public bool TryGetSecant(Vector3 position, Vector3 velocity, Vector3 acceleration, float arcDistance, out Vector3 secant) {
	if (acceleration == Vector3.zero) {
		secant = velocity;
		return false;
	}

	var axis = Vector3.Cross(velocity, acceleration);
	if (axis == Vector3.zero) {
		secant = velocity;

## Fade Parameters.md

      
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                / Fade Parameters.md
            
            
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              January 18, 2021 16:48
            
              
                Small writeup on FadeParams shader vectors
              
          
    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)

	public bool TryGetSecant(Vector3 position, Vector3 velocity, Vector3 acceleration, float arcDistance, out Vector3 secant) {
	if (acceleration == Vector3.zero) {
	secant = velocity;
	return false;
	}

	var axis = Vector3.Cross(velocity, acceleration);
	if (axis == Vector3.zero) {
	secant = velocity;