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Revolution. Use length(xy) as one of the parameters for any function.
Subtract X from SDF - scale it up.
max - intersect
min - unite
lerp(sdf1, sdf2, t) to morph the two

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// Article:   https://medium.com/@quizcanners/unity-i-have-a-custom-editor-for-every-script-5eddf20fdacc

using System.Collections.Generic;
using QuizCanners.Inspector;

#if UNITY_EDITOR
using UnityEditor;
#endif

 public class SomeScript : MonoBehaviour: IPEGI {

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inline float3 DetectSmoothEdge(float3 edge, float3 junkNorm, float3 sharpNorm, float3 edge0, float3 edge1, float3 edge2) {
edge = max(0, edge - 0.965) * 28;
 float allof = edge.r + edge.g + edge.b;
float border = min(1, allof);
float3 edgeN = edge0*edge.r + edge1*edge.g + edge2*edge.b;
float junk = min(1, (edge.g*edge.b + edge.r*edge.b + edge.r*edge.g)*2);
return normalize((sharpNorm*(1 - border)+ border*edgeN)*(1 - junk) + junk*(junkNorm));
}

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// Transparency
	alpha:fade  // Means it is not a glass
        Tags { "Queue" = "Transparent" "RenderType" = "Transparent" }
	ZWrite Off
	Blend SrcAlpha OneMinusSrcAlpha
	
// Adjusting strength of the Normal  
  o.Normal = UnpackNormal(bump0);
	o.Normal.xy  *= wet;
	o.Normal.z = 1;

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public Inspect() 
{
  if ("Object's Transparency:".edit(ref transparency))
    RecalculateShaderParameters();
  
  if (transparency != 0.5f && icon.Refresh.Click("Will load default value",25).nl())
    transparency = 0.5f;
}

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 public override void OnInspectorGUI() {
   
  var controller = (MyMaterialController )target;

  EditorGUILayout.BeginHorizontal();

  EditorGUI.BeginChangeCheck();

  controller .transparency = EditorGUILayout.FloatField("Object's Transparency:", controller .transparency);

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//  https://gist.github.com/hecomi/9580605
//Dirctionary:

View Matrix : camera.worldToCameraMatrix


// How to project a texture:
      //cs:
      projectionMatrix = camera.projectionMatrix * camera.worldToCameraMatrix
      //vert:

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// All functions: http://developer.download.nvidia.com/CgTutorial/cg_tutorial_appendix_e.html

// Performance 
	// Accessing with "_Name" is slower
	Shader.SetGlobalFloat("_Name", value); // => 
	int id = Shader.PropertyToID("_Name"); // Once at Start/ OnEnable
	Shader.SetGlobalFloat(id, value); 
	
// Trouble-shooting:
	// Black Pixels on some devices		= Division by zero

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// This is a starting point for most effects I make.
Shader "Playtime Painter/Effects/Circle" {
	Properties{
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		[Toggle(_DEBUG)] debugOn("Debug", Float) = 0
	}

	SubShader{

		Tags{

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//https://neginfinity.bitbucket.io/   - a blog where I found how to do shadows for raymarched/raytraced primitives.
//https://docs.unity3d.com/Manual/SL-UnityShaderVariables.html
//https://github.com/TwoTailsGames/Unity-Built-in-Shaders/blob/master/CGIncludes/UnityCG.cginc - Most interesting stuff ;)
//https://github.com/TwoTailsGames/Unity-Built-in-Shaders/tree/master/CGIncludes
//https://docs.unity3d.com/Manual/SL-Shader.html
//http://developer.download.nvidia.com/CgTutorial/cg_tutorial_appendix_e.html
//https://unity3d.com/how-to/shader-profiling-and-optimization-tips
//https://docs.unity3d.com/Manual/SL-UnityShaderVariables.html
//http://www.deepskycolors.com/archive/2010/04/21/formulas-for-Photoshop-blending-modes.html
//http://www.iquilezles.org/blog/