Unity3D 实现阴阳师 画符

OnRenderObject:在完成所有常规场景渲染后调用此函数。此时，可使用 GL 类或 Graphics.DrawMeshNow 绘制自定义几何图形。

C# 代码部分：

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

public class huafu : MonoBehaviour

{

List<Vector3> PointList;

public Image image;

Texture2D texture;

// Start is called before the first frame update

void Start()

{

PointList = new List<Vector3>();

texture = new Texture2D(300, 400);// image.sprite.texture;

image.GetComponent<Image>().material.mainTexture = texture;

}

static Material lineMaterial;

static void CreateLineMaterial()

{

if (!lineMaterial)

{

// Unity has a built-in shader that is useful for drawing

// simple colored things.

Shader shader = Shader.Find("Hidden/Internal-Colored");//Custom/OutLine");

lineMaterial = new Material(shader);

lineMaterial.hideFlags = HideFlags.HideAndDontSave;

// Turn on alpha blending

lineMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);

lineMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);

// Turn backface culling off

lineMaterial.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);

// Turn off depth writes

lineMaterial.SetInt("_ZWrite", 0);

}

}

public void OnRenderObject()

{

CreateLineMaterial();

// Apply the line material

lineMaterial.SetPass(0);

//正交投影

GL.LoadOrtho();

// Draw lines

if (PointList.Count > 2)

{

GL.Begin(GL.LINES);

for (int i = 0; i < PointList.Count-1; ++i)

{

GL.Color(Color.red);

GL.Vertex(PointList[i]);

GL.Vertex(PointList[i+1]);

}

GL.End();

}

// GLTrianGles2(myPoint2);

}

void GenerateTexture()

{

// texture = new Texture2D(300, 400);

for (int i = 0; i < PointList.Count-1; i++)

{

int XX = (int)(PointList[i].x * texture.width);

int YY = (int)(PointList[i].y * texture.height);

int XX1 = (int)(PointList[i+1].x * texture.width);

int YY1 = (int)(PointList[i+1].y * texture.height);

// 两点之间 做lerp插值

for (int j = 0; j < 80; j++)

{

int tmpXX =(int) Mathf.Lerp(XX, XX1, j / 80.0f);

int tmpYY = (int)Mathf.Lerp(YY, YY1, j / 80.0f);

texture.SetPixel(tmpXX, tmpYY, Color.red);

}

}

texture.Apply();

image.GetComponent<Image>().material.mainTexture = texture;

// GetComponent<Renderer>().material.mainTexture = texture;

}

// Update is called once per frame

void Update()

{

if (Input.GetMouseButton(0))

{

Debug.Log(Input.mousePosition+" "+ Screen.width);

Vector2 viewPos = Camera.main.ScreenToViewportPoint(Input.mousePosition);

if (PointList.Count == 0)

{

PointList.Add(viewPos);

}

else if (Input.mousePosition != PointList[PointList.Count - 1])

PointList.Add(viewPos);

}

if (Input.GetMouseButtonUp(0))

{

GenerateTexture();

PointList.Clear();

}

}

}

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