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(0,0,0),
            new Vector3(1,1,0),
            new Vector3(-1,1,0),
        };

        int[]  mIndexArr = new int[] {0, 2,1};
        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,0);
    }
}

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"
}