I recently made a cube out of a procedural mesh so I could use the UV mapping for some textures. I got it working almost perfectly, but when testing using colors for each face I can tell it’s not pixel perfect.
Script
using UnityEngine;
using System.Collections;
public class CustomMeshes : MonoBehaviour
{
#region Cube
public static GameObject CreateCube()
{
GameObject gameObject = new GameObject(); //Create GameObject to store everything
gameObject.name = "Cube"; //Assign name
gameObject.tag = "BuildingBlock"; //Assign tag
gameObject.layer = 11; //Assign layer
MeshFilter filter = gameObject.AddComponent<MeshFilter>(); //Add filter
Mesh mesh = filter.mesh; //Add variable to store mesh
mesh.Clear(); //Clear variable of mesh
gameObject.AddComponent<MeshRenderer>(); //Add renderer so it's visible
MeshCollider collider = gameObject.AddComponent<MeshCollider>(); //Add collider so it can get hit by raycasts
float length = 1f;
float width = 1f;
float height = 1f;
#region Vertices
Vector3 p0 = new Vector3(-length * 0.5f, -width * 0.5f, height * 0.5f);
Vector3 p1 = new Vector3(length * 0.5f, -width * 0.5f, height * 0.5f);
Vector3 p2 = new Vector3(length * 0.5f, -width * 0.5f, -height * 0.5f);
Vector3 p3 = new Vector3(-length * 0.5f, -width * 0.5f, -height * 0.5f);
Vector3 p4 = new Vector3(-length * 0.5f, width * 0.5f, height * 0.5f);
Vector3 p5 = new Vector3(length * 0.5f, width * 0.5f, height * 0.5f);
Vector3 p6 = new Vector3(length * 0.5f, width * 0.5f, -height * 0.5f);
Vector3 p7 = new Vector3(-length * 0.5f, width * 0.5f, -height * 0.5f);
Vector3[] Vertices = new Vector3[]
{
//Bottom
p0, p1, p2, p3,
//Left
p7, p4, p0, p3,
//Front
p4, p5, p1, p0,
//Back
p6, p7, p3, p2,
//Right
p5, p6, p2, p1,
//Top
p7, p6, p5, p4,
};
#endregion
#region Normals
Vector3 Up = Vector3.up;
Vector3 Down = Vector3.down;
Vector3 Front = Vector3.forward;
Vector3 Back = Vector3.back;
Vector3 Left = Vector3.left;
Vector3 Right = Vector3.right;
Vector3[] normals = new Vector3[]
{
//Bottom
Down, Down, Down, Down,
//Left
Left, Left, Left, Left,
//Front
Front, Front, Front, Front,
//Back
Back, Back, Back, Back,
//Right
Right, Right, Right, Right,
//Top
Up, Up, Up, Up,
};
#endregion
#region UVs
/* Assign Order
* ----------------------
* Bottom: Bottom left, bottom right, top right, top left.
* Left: Top right, top left, bottom left, bottom right.
* Front: Top right, top left, bottom left, bottom right.
* Back: Top right, top left, bottom left, bottom right.
* Right: Top right, top left, bottom left, bottom right.
* Top: Bottom left, bottom right, top right, top left.
*
* UV Texture Order
* ----------------------
* Front, Back, Top,
* Bottom, Left, Right.
*/
Vector2[] UVs = new Vector2[]
{
//Bottom
new Vector2(0, 0), new Vector2(0.333f, 0), new Vector2(0.333f, 0.5f), new Vector2(0, 0.5f),
//Left
new Vector2(0.665f, 0.5f), new Vector2(0.333f, 0.5f), new Vector2(0.333f, 0), new Vector2(0.665f, 0),
//Front
new Vector2(0.333f, 1), new Vector2(0, 1), new Vector2(0, 0.5f), new Vector2(0.333f, 0.5f),
//Back
new Vector2(0.665f, 1), new Vector2(0.333f, 1), new Vector2(0.333f, 0.5f), new Vector2(0.665f, 0.5f),
//Right
new Vector2(1, 0.5f), new Vector2(0.665f, 0.5f), new Vector2(0.665f, 0), new Vector2(1, 0),
//Top
new Vector2(0.665f, 0.5f), new Vector2(1, 0.5f), new Vector2(1, 1), new Vector2(0.665f, 1),
};
#endregion
#region Triangles
int[] triangles = new int[]
{
//Bottom
3, 1, 0,
3, 2, 1,
//Left
3 + 4 * 1, 1 + 4 * 1, 0 + 4 * 1,
3 + 4 * 1, 2 + 4 * 1, 1 + 4 * 1,
//Front
3 + 4 * 2, 1 + 4 * 2, 0 + 4 * 2,
3 + 4 * 2, 2 + 4 * 2, 1 + 4 * 2,
//Back
3 + 4 * 3, 1 + 4 * 3, 0 + 4 * 3,
3 + 4 * 3, 2 + 4 * 3, 1 + 4 * 3,
//Right
3 + 4 * 4, 1 + 4 * 4, 0 + 4 * 4,
3 + 4 * 4, 2 + 4 * 4, 1 + 4 * 4,
//Top
3 + 4 * 5, 1 + 4 * 5, 0 + 4 * 5,
3 + 4 * 5, 2 + 4 * 5, 1 + 4 * 5,
};
#endregion
mesh.vertices = Vertices;
mesh.normals = normals;
mesh.uv = UVs;
mesh.triangles = triangles;
mesh.RecalculateBounds();
mesh.Optimize();
collider.sharedMesh = null;
collider.sharedMesh = mesh;
return gameObject;
}
#endregion
}
Sorry it isn’t all commented, as you might imagine it’s a work in progress. I’m sure you get the picture.
The Texture
The Result
It’s not crucial since you probably won’t be able to notice once I throw on a proper texture, but it’d be neat to know it’s pixel perfect. Thanks in advance 