UNITY3D給立方體六個面貼不同的紋理圖
2019/5/10??????點擊：
using UnityEngine;
using System.Collections;
[RequireComponent(typeof(MeshFilter), typeof(MeshRenderer))]
public class Test3D : MonoBehaviour
{
public enum Direction
{
ClockWise,
Anti_ClockWise
}
public Material mat;
public Direction direction;
// Use this for initialization
void Start()
{
switch (direction)
{
case Direction.ClockWise:
DrawCubeWithUV_CloclWise();
break;
case Direction.Anti_ClockWise:
DrawCubeWithUV_Anti_CloclWise();
break;
}
}
void DrawCubeWithUV_CloclWise()
{
gameObject.GetComponent().material = mat;
Mesh mesh = GetComponent().mesh;
mesh.Clear();
//設置頂點
mesh.vertices = new Vector3[]
{
//front
new Vector3(0, 0, 0),
new Vector3(0, 0, 1),
new Vector3(1, 0, 1),
new Vector3(1, 0, 0),
//top
new Vector3(0, 0, 1),
new Vector3(0, 1, 1),
new Vector3(1, 1, 1),
new Vector3(1, 0, 1),
//back
new Vector3(0, 1, 1),
new Vector3(0, 1, 0),
new Vector3(1, 1, 0),
new Vector3(1, 1, 1),
//bottom
new Vector3(0, 1, 0),
new Vector3(0, 0, 0),
new Vector3(1, 0, 0),
new Vector3(1, 1, 0),
//left
new Vector3(0, 1, 0),
new Vector3(0, 1, 1),
new Vector3(0, 0, 1),
new Vector3(0, 0, 0),
//right
new Vector3(1, 0, 0),
new Vector3(1, 0, 1),
new Vector3(1, 1, 1),
new Vector3(1, 1, 0),
};
//順時針看不到正面的，貼圖在里面
mesh.triangles = new int[]
{
0,1,2,
0,2,3,
4,5,6,
4,6,7,
8,9,10,
8,10,11,
12,13,14,
12,14,15,
16,17,18,
16,18,19,
20,21,22,
20,22,23
};
Vector2[] uvs = new Vector2[mesh.vertices.Length];
for (int i = 0; i < uvs.Length; i += 4)
{
//正常貼圖
uvs[i] = new Vector2(0, 0);
uvs[i + 1] = new Vector2(0, 1);
uvs[i + 2] = new Vector2(1, 1);
uvs[i + 3] = new Vector2(1, 0);
//轉換貼圖
//uvs[i] = new Vector2(1, 0);
//uvs[i + 1] = new Vector2(1, 1);
//uvs[i + 2] = new Vector2(0, 1);
//uvs[i + 3] = new Vector2(0, 0);
}
mesh.uv = uvs;
//Vector3[] normals = new Vector3[mesh.vertices.Length];
//for (int i = 0; i < normals.Length; i++)
//{
// if (i < 4)
// normals[i] = Vector3.forward;
// if (i >= 4 && i < 8)
// normals[i] = Vector3.up;
// if (i >= 8 && i < 12)
// normals[i] = Vector3.back;
// if (i >= 12 && i < 16)
// normals[i] = Vector3.down;
// if (i >= 16 && i < 20)
// normals[i] = Vector3.left;
// if (i >= 20 && i < 24)
// normals[i] = Vector3.right;
//}
//mesh.normals = normals;
}
void DrawCubeWithUV_Anti_CloclWise()
{
gameObject.GetComponent().material = mat;
Mesh mesh = GetComponent().mesh;
mesh.Clear();
//設置頂點
mesh.vertices = new Vector3[]
{
//front
new Vector3(0, 0, 0),
new Vector3(0, 0, 1),
new Vector3(1, 0, 1),
new Vector3(1, 0, 0),
//top
new Vector3(0, 0, 1),
new Vector3(0, 1, 1),
new Vector3(1, 1, 1),
new Vector3(1, 0, 1),
//back
new Vector3(0, 1, 1),
new Vector3(0, 1, 0),
new Vector3(1, 1, 0),
new Vector3(1, 1, 1),
//bottom
new Vector3(0, 1, 0),
new Vector3(0, 0, 0),
new Vector3(1, 0, 0),
new Vector3(1, 1, 0),
//left
new Vector3(0, 1, 0),
new Vector3(0, 1, 1),
new Vector3(0, 0, 1),
new Vector3(0, 0, 0),
//right
new Vector3(1, 0, 0),
new Vector3(1, 0, 1),
new Vector3(1, 1, 1),
new Vector3(1, 1, 0),
};
//逆時針看到的很好，但是貼圖反了
mesh.triangles = new int[]
{
0,2,1,
0,3,2,
4,6,5,
4,7,6,
8,10,9,
8,11,10,
12,14,13,
12,15,14,
16,18,17,
16,19,18,
20,22,21,
20,23,22
};
#if false
//六個面貼同一張圖片
Vector2[] uvs = new Vector2[mesh.vertices.Length];
for (int i = 0; i < uvs.Length; i += 4)
{
//uvs[i] = new Vector2(0, 0);
//uvs[i + 1] = new Vector2(0, 1);
//uvs[i + 2] = new Vector2(1, 1);
//uvs[i + 3] = new Vector2(1, 0);
uvs[i] = new Vector2(1, 0);
uvs[i + 1] = new Vector2(1, 1);
uvs[i + 2] = new Vector2(0, 1);
uvs[i + 3] = new Vector2(0, 0);
}
mesh.uv = uvs;
#else
//六個面貼不同的圖片
Vector2[] uvs = sixTexForCube(mesh.vertices);
mesh.uv = uvs;
#endif
//法線
//Vector3[] normals = new Vector3[mesh.vertices.Length];
//for (int i = 0; i < normals.Length; i++)
//{
// if (i < 4)
// normals[i] = Vector3.forward;
// if (i >= 4 && i < 8)
// normals[i] = Vector3.up;
// if (i >= 8 && i < 12)
// normals[i] = Vector3.back;
// if (i >= 12 && i < 16)
// normals[i] = Vector3.down;
// if (i >= 16 && i < 20)
// normals[i] = Vector3.left;
// if (i >= 20 && i < 24)
// normals[i] = Vector3.right;
//}
//mesh.normals = normals;
}
Vector2[] sixTexForCube(Vector3[] verticles)
{
Vector2[] uv = new Vector2[verticles.Length];
float t = 1 / 3f;
//front
uv[0] = new Vector2(t, 0);
uv[1] = new Vector2(t, t);
uv[2] = new Vector2(0, t);
uv[3] = new Vector2(0, 0);
//top
uv[4] = new Vector2(2 * t, 0);
uv[5] = new Vector2(2 * t, t);
uv[6] = new Vector2(t, t);
uv[7] = new Vector2(t, 0);
//back
uv[8] = new Vector2(1, 0);
uv[9] = new Vector2(1, t);
uv[10] = new Vector2(2 * t, t);
uv[11] = new Vector2(2 * t, 0);
//Bottom
uv[12] = new Vector2(t, t);
uv[13] = new Vector2(t, 2 * t);
uv[14] = new Vector2(0, 2 * t);
uv[15] = new Vector2(0, t);
//left
uv[16] = new Vector2(2 * t, t);
uv[17] = new Vector2(2 * t, 2 * t);
uv[18] = new Vector2(t, 2 * t);
uv[19] = new Vector2(t, t);
//right
uv[20] = new Vector2(1, t);
uv[21] = new Vector2(1, 2 * t);
uv[22] = new Vector2(2 * t, 2 * t);
uv[23] = new Vector2(2 * t, t);
return uv;
}
}
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