Noob to Pro Unity Shader Writing

Shaderlab – core unity shader language, required in all shaders, very basic
CG, nvidia, powerful
GLSL, mobile shader, very similar to CG.
Float, Half (+-60000 range, 3.3 decimal precision), Fixed +- 2.0 range, 1/256 precision, most optimized

Example Shader Code in Unity 5.4

Flat Color

    /**
     * Writen by Ruofei Du.  Use it, edit it, steal it I don't care.
     */
Shader "MyShaders/FlatColor" {
	Properties {
		_Color ("Color", Color) = (1.0, 1.0, 1.0, 1.0)
	}

	SubShader {
		Pass {
			CGPROGRAM

			// pragmas
			#pragma vertex vert
			#pragma fragment frag

			// user defined variables
			uniform float4 _Color;
		    
	        // base input structs
			struct vertexInput {
				float4 vertex : POSITION;
			};

			struct vertexOutput {
				float4 pos : SV_POSITION; 
			};

			// vertex function
			vertexOutput vert(vertexInput v) {
				vertexOutput o; 
				o.pos = mul(UNITY_MATRIX_MVP, v.vertex); 
				return o; 
			}

			// fragment function
			float4 frag(vertexOutput i) : COLOR {
				return _Color; 
			}

		    ENDCG
	    }
	}

	// fallback commendted out during development
	// Fallback "Diffuse"
}

/**

* Writen by Ruofei Du. Use it, edit it, steal it I don't care.

Shader "MyShaders/FlatColor" {

Properties {

_Color ("Color", Color) = (1.0, 1.0, 1.0, 1.0)

}

SubShader {

Pass {

CGPROGRAM

// pragmas

#pragma vertex vert

#pragma fragment frag

// user defined variables

uniform float4 _Color;

// base input structs

struct vertexInput {

float4 vertex : POSITION;

};

struct vertexOutput {

float4 pos : SV_POSITION;

};

// vertex function

vertexOutput vert(vertexInput v) {

vertexOutput o;

o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

return o;

}

// fragment function

float4 frag(vertexOutput i) : COLOR {

return _Color;

}

ENDCG

}

// fallback commendted out during development

// Fallback "Diffuse"

}

Projective Texture

/**
 * Writen by Ruofei Du.  Use it, edit it, steal it I don't care.
 */

Shader "MyShaders/ProjectiveTexture" {
	// use arrays later on
	// https://docs.unity3d.com/Manual/SL-Properties.html
	Properties {
		_Tex0("Texture 0", 2D) = "white" {}
	}

		SubShader{
			Pass {
				CGPROGRAM

				// pragmas
				#pragma vertex vert
				#pragma fragment frag

				// user defined variables
				uniform float4x4 _Cam0;
				uniform sampler2D _Tex0;

				// base input structs
				struct vertexInput
				{
					float4 position : POSITION;
				};

				struct vertexOutput
				{
					float4 pos      : SV_POSITION;
					float4 texCoord : TEXCOORD0; 
				};

				// helper function
				float2 projectcoord(float4 texture_coord) { return (texture_coord.xy / texture_coord.w + 1.0) * 0.5; }

				// Built-in shader variables https://docs.unity3d.com/Manual/SL-UnityShaderVariables.html
				// vertex function
				vertexOutput vert(vertexInput v) {
					vertexOutput o;
					o.pos = mul(UNITY_MATRIX_MVP, v.position);

					o.texCoord = mul(_Cam0, mul(unity_ObjectToWorld, v.position));
					return o;
				}

				// fragment function
				float4 frag(vertexOutput v) : COLOR {
					float2 vUv = projectcoord(v.texCoord);
					if (vUv.x < 0.0 || vUv.y < 0.0 || vUv.x > 1.0 || vUv.y > 1.0) discard;
					float4 cVideo = tex2D(_Tex0, vUv);
					return cVideo; 
				}

				ENDCG
			}
		}

		// fallback commendted out during development
		// Fallback "Diffuse"
}

/**

* Writen by Ruofei Du. Use it, edit it, steal it I don't care.

Shader "MyShaders/ProjectiveTexture" {

// use arrays later on

// https://docs.unity3d.com/Manual/SL-Properties.html

Properties {

_Tex0("Texture 0", 2D) = "white" {}

}

SubShader{

Pass {

CGPROGRAM

// pragmas

#pragma vertex vert

#pragma fragment frag

// user defined variables

uniform float4x4 _Cam0;

uniform sampler2D _Tex0;

// base input structs

struct vertexInput

{

float4 position : POSITION;

};

struct vertexOutput

{

float4 pos : SV_POSITION;

float4 texCoord : TEXCOORD0;

};

// helper function

float2 projectcoord(float4 texture_coord) { return (texture_coord.xy / texture_coord.w + 1.0) * 0.5; }

// Built-in shader variables https://docs.unity3d.com/Manual/SL-UnityShaderVariables.html

// vertex function

vertexOutput vert(vertexInput v) {

vertexOutput o;

o.pos = mul(UNITY_MATRIX_MVP, v.position);

o.texCoord = mul(_Cam0, mul(unity_ObjectToWorld, v.position));

return o;

}

// fragment function

float4 frag(vertexOutput v) : COLOR {

float2 vUv = projectcoord(v.texCoord);

if (vUv.x < 0.0 || vUv.y < 0.0 || vUv.x > 1.0 || vUv.y > 1.0) discard;

float4 cVideo = tex2D(_Tex0, vUv);

return cVideo;

}

ENDCG

}

// fallback commendted out during development

// Fallback "Diffuse"

}

Fly Camera

using UnityEngine;
using System.Collections;

public class FlyCamera : MonoBehaviour
{
    /**
     * Writen by Windexglow 11-13-10.  Use it, edit it, steal it I don't care.
     * Converted to C# 27-02-13 - no credit wanted.
     * Added resetRotation, RF control, improved initial mouse position, 2015-03-11 - Roi Danton.
     * Simple flycam I made, since I couldn't find any others made public.
     * Made simple to use (drag and drop, done) for regular keyboard layout
     * wasdrf : basic movement
     * shift : Makes camera accelerate
     * space : Moves camera on X and Z axis only.  So camera doesn't gain any height
     */

    float mainSpeed = 2.5f; // Regular speed.
    float shiftAdd = 6;  // Multiplied by how long shift is held.  Basically running.
    float maxShift = 20; // Maximum speed when holding shift.
    float camSens = .25f;  // Camera sensitivity by mouse input.
    //float mainSpeed = 5; // Regular speed.
    //float shiftAdd = 12;  // Multiplied by how long shift is held.  Basically running.
    //float maxShift = 50; // Maximum speed when holding shift.
    //float camSens = .25f;  // Camera sensitivity by mouse input.
    private Vector3 lastMouse = new Vector3(Screen.width / 2, Screen.height / 2, 0); // Kind of in the middle of the screen, rather than at the top (play).
    private float totalRun = 1.0f;

    bool mouseUpdated = false;
    void Update()
    {

        // Mouse input.
        if (Input.GetMouseButton(0))
        {
            if (!mouseUpdated)
            {
                lastMouse = Input.mousePosition;
            }

            lastMouse = Input.mousePosition - lastMouse;
            lastMouse = new Vector3(-lastMouse.y * camSens, lastMouse.x * camSens, 0);
            lastMouse = new Vector3(transform.eulerAngles.x + lastMouse.x, transform.eulerAngles.y + lastMouse.y, 0);
            transform.eulerAngles = lastMouse;
            lastMouse = Input.mousePosition;
            mouseUpdated = true;
        }
        else
        {
            mouseUpdated = false;
        }


        // Keyboard commands.
        Vector3 p = getDirection();
        if (Input.GetKey(KeyCode.LeftShift))
        {
            totalRun += Time.deltaTime;
            p = p * totalRun * shiftAdd;
            p.x = Mathf.Clamp(p.x, -maxShift, maxShift);
            p.y = Mathf.Clamp(p.y, -maxShift, maxShift);
            p.z = Mathf.Clamp(p.z, -maxShift, maxShift);
        }
        else {
            totalRun = Mathf.Clamp(totalRun * 0.5f, 1f, 1000f);
            p = p * mainSpeed;
        }

        p = p * Time.deltaTime;
        Vector3 newPosition = transform.position;
        if (Input.GetKey(KeyCode.V))
        { //If player wants to move on X and Z axis only
            transform.Translate(p);
            newPosition.x = transform.position.x;
            newPosition.z = transform.position.z;
            transform.position = newPosition;
        }
        else {
            transform.Translate(p);
        }

    }

    private Vector3 getDirection()
    {
        Vector3 p_Velocity = new Vector3();
        float amount = 0.3f;

        if (Input.GetKey(KeyCode.W))
        {
            p_Velocity += new Vector3(0, 0, amount);
        }
        if (Input.GetKey(KeyCode.S))
        {
            p_Velocity += new Vector3(0, 0, -amount);
        }
        if (Input.GetKey(KeyCode.A))
        {
            p_Velocity += new Vector3(-amount, 0, 0);
        }
        if (Input.GetKey(KeyCode.D))
        {
            p_Velocity += new Vector3(amount, 0, 0);
        }
        if (Input.GetKey(KeyCode.R) || Input.GetKey(KeyCode.Q))
        {
            p_Velocity += new Vector3(0, amount, 0);
        }
        if (Input.GetKey(KeyCode.F) || Input.GetKey(KeyCode.E))
        {
            p_Velocity += new Vector3(0, -amount, 0);
        }
        return p_Velocity;
    }

    public void resetRotation(Vector3 lookAt)
    {
        transform.LookAt(lookAt);
    }
}

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using UnityEngine;

using System.Collections;

public class FlyCamera : MonoBehaviour

{

/**

* Writen by Windexglow 11-13-10. Use it, edit it, steal it I don't care.

* Converted to C# 27-02-13 - no credit wanted.

* Added resetRotation, RF control, improved initial mouse position, 2015-03-11 - Roi Danton.

* Simple flycam I made, since I couldn't find any others made public.

* Made simple to use (drag and drop, done) for regular keyboard layout

* wasdrf : basic movement

* shift : Makes camera accelerate

* space : Moves camera on X and Z axis only. So camera doesn't gain any height

float mainSpeed = 2.5f; // Regular speed.

float shiftAdd = 6; // Multiplied by how long shift is held. Basically running.

float maxShift = 20; // Maximum speed when holding shift.

float camSens = .25f; // Camera sensitivity by mouse input.

//float mainSpeed = 5; // Regular speed.

//float shiftAdd = 12; // Multiplied by how long shift is held. Basically running.

//float maxShift = 50; // Maximum speed when holding shift.

//float camSens = .25f; // Camera sensitivity by mouse input.

private Vector3 lastMouse = new Vector3(Screen.width / 2, Screen.height / 2, 0); // Kind of in the middle of the screen, rather than at the top (play).

private float totalRun = 1.0f;

bool mouseUpdated = false;

void Update()

{

// Mouse input.

if (Input.GetMouseButton(0))

{

if (!mouseUpdated)

{

lastMouse = Input.mousePosition;

}

lastMouse = Input.mousePosition - lastMouse;

lastMouse = new Vector3(-lastMouse.y * camSens, lastMouse.x * camSens, 0);

lastMouse = new Vector3(transform.eulerAngles.x + lastMouse.x, transform.eulerAngles.y + lastMouse.y, 0);

transform.eulerAngles = lastMouse;

lastMouse = Input.mousePosition;

mouseUpdated = true;

}

else

{

mouseUpdated = false;

}

// Keyboard commands.

Vector3 p = getDirection();

if (Input.GetKey(KeyCode.LeftShift))

{

totalRun += Time.deltaTime;

p = p * totalRun * shiftAdd;

p.x = Mathf.Clamp(p.x, -maxShift, maxShift);

p.y = Mathf.Clamp(p.y, -maxShift, maxShift);

p.z = Mathf.Clamp(p.z, -maxShift, maxShift);

}

else {

totalRun = Mathf.Clamp(totalRun * 0.5f, 1f, 1000f);

p = p * mainSpeed;

}

p = p * Time.deltaTime;

Vector3 newPosition = transform.position;

if (Input.GetKey(KeyCode.V))

{ //If player wants to move on X and Z axis only

transform.Translate(p);

newPosition.x = transform.position.x;

newPosition.z = transform.position.z;

transform.position = newPosition;

}

else {

transform.Translate(p);

}

private Vector3 getDirection()

{

Vector3 p_Velocity = new Vector3();

float amount = 0.3f;

if (Input.GetKey(KeyCode.W))

{

p_Velocity += new Vector3(0, 0, amount);

}

if (Input.GetKey(KeyCode.S))

{

p_Velocity += new Vector3(0, 0, -amount);

}

if (Input.GetKey(KeyCode.A))

{

p_Velocity += new Vector3(-amount, 0, 0);

}

if (Input.GetKey(KeyCode.D))

{

p_Velocity += new Vector3(amount, 0, 0);

}

if (Input.GetKey(KeyCode.R) || Input.GetKey(KeyCode.Q))

{

p_Velocity += new Vector3(0, amount, 0);

}

if (Input.GetKey(KeyCode.F) || Input.GetKey(KeyCode.E))

{

p_Velocity += new Vector3(0, -amount, 0);

}

return p_Velocity;

}

public void resetRotation(Vector3 lookAt)

{

transform.LookAt(lookAt);

}

Trigger

using UnityEngine;
using UnityEngine.UI; 
using System.Collections;

public class PlayerController : MonoBehaviour {

    public Text countText;
    public Text winText; 
    public float speed;

    private Rigidbody rb;
    private int count; 

	// Use this for initialization
	void Start ()
    {
        rb = GetComponent<Rigidbody>();
        count = 0;
        SetCountText();
        winText.text = ""; 
	}
	
	// Update is called once per frame
	void Update ()
    {
	
	}

    void FixedUpdate()
    {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

        rb.AddForce(movement * speed); 
    }

    void OnTriggerEnter(Collider other)
    {
        //Destroy(other.gameObject); 
        if (other.gameObject.CompareTag("Pick Up"))
        {
            other.gameObject.SetActive(false);
            ++count;
            SetCountText(); 
        }
    }

    void SetCountText()
    {
        countText.text = "Count: " + count.ToString();
        if (count >= 12)
        {
            winText.text = "You win!"; 
        }
    }
}

using UnityEngine;

using UnityEngine.UI;

using System.Collections;

public class PlayerController : MonoBehaviour {

public Text countText;

public Text winText;

public float speed;

private Rigidbody rb;

private int count;

// Use this for initialization

void Start ()

{

rb = GetComponent<Rigidbody>();

count = 0;

SetCountText();

winText.text = "";

}

// Update is called once per frame

void Update ()

{

}

void FixedUpdate()

{

float moveHorizontal = Input.GetAxis("Horizontal");

float moveVertical = Input.GetAxis("Vertical");

Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

rb.AddForce(movement * speed);

}

void OnTriggerEnter(Collider other)

{

//Destroy(other.gameObject);

if (other.gameObject.CompareTag("Pick Up"))

{

other.gameObject.SetActive(false);

++count;

SetCountText();

}

void SetCountText()

{

countText.text = "Count: " + count.ToString();

if (count >= 12)

{

winText.text = "You win!";

}

Unity

Noob to Pro Unity Shader Writing

Example Shader Code in Unity 5.4

Flat Color

Projective Texture

Fly Camera

Trigger

Related

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Noob to Pro Unity Shader Writing

Example Shader Code in Unity 5.4

Flat Color

Projective Texture

Fly Camera

Trigger

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Related

Leave a Reply Cancel reply