unity 绘制三角形

哎 该学的还是要学

参考：http://www.narkii.com/club/thread-369573-1.html

unity 顶点绘制三角形

脚本绘制;

其实filter和render就是进行资源的加载以及渲染的设置，和device和context类似。

其中注意的是Material中shader路径的加载。。。。

 using UnityEngine;
 using System.Collections;

 //meshFilter 数据资源的加载
 //meshRender 加载后渲染的设置
 public class DrawTriangleTest : MonoBehaviour
 {

     private Mesh m_mesh;
     public Material m_material;

     private void Awake()
     {
         if(m_material.shader==null)
         m_material = new Material(Shader.Find("Custom/TriangleTest"));
     }

     // Use this for initialization
     void Start ()
     {
         Vector3[] trianglePos = new Vector3[]
         {
             new Vector3(,,),
             new Vector3(,,),
             new Vector3(-,,),
         };

         int[]  mIndexArr = new int[] {, ,};
         Color[] mColorArr = new Color[] {Color.green,Color.red,Color.blue};

         m_mesh = new Mesh();
         m_mesh.vertices = trianglePos;
         m_mesh.triangles = mIndexArr;
         m_mesh.colors = mColorArr;

     }

     // Update is called once per frame
     void Update ()
     {
         Graphics.DrawMesh(m_mesh,Vector3.zero,Quaternion.identity,m_material,);
     }
 }

shader进行cull back 操作:

 Shader "Custom/TriangleTest" {
     Properties {
         }
     SubShader {
         Pass{

         Fog{Mode off}
         Cull Back

         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         #include "UnityCG.cginc"

     struct vToFragment
     {
        float4 pos : SV_POSITION;
        float4 color : color0;
     };

     vToFragment vert(appdata_full inV)
     {
         vToFragment outToFrag;
         outToFrag.pos = mul(UNITY_MATRIX_MVP,inV.vertex);
         outToFrag.color= inV.color;
         return outToFrag;
      }

     float4 frag(vToFragment inData):SV_Target
     {
         float4 outColor;
         outColor = inData.color;
         return outColor;
     }

         ENDCG
     }
     }
     FallBack "Diffuse"
 }