private Transform CreateHoleWallObject(List <Vector3> shapePoints = null)
{
var centerOfMass = MyMaths.CenterOfVectors(shapePoints);
for (var i = 0; i < shapePoints.Count; i++)
{
// Set points relative to the shape center
shapePoints[i] = shapePoints[i] - centerOfMass;
}
var startIndex = 1;
var endIndex = shapePoints.Count - 1;
Vector3[] vertices;
Vector2[] uv;
Mesh mesh;
var holeWalls = Instantiate(_dynamicHoleWallPrefab, centerOfMass, Quaternion.identity, transform);
holeWalls.GetComponent <MeshFilter>().mesh = mesh = new Mesh();
holeWalls.gameObject.name = mesh.name = $"HoleWall{_holeId}";
var num = endIndex - startIndex;
vertices = new Vector3[num * 2];
uv = new Vector2[num * 2];
int[] triangles = new int[(num + 1) * 6 * 2];
// Triangulate band
var bandLen = Mathf.Sqrt(shapePoints.Sum(x => x.sqrMagnitude));
var t = 0;
for (int i = startIndex, k = 0; i < endIndex; i++, k++)
{
vertices[k] = shapePoints[i] + Vector3.up;
vertices[k + num] = shapePoints[i]; // + Vector3.down;
if (i < endIndex - 1)
{
// CW
triangles[t++] = k;
triangles[t++] = k + 1;
triangles[t++] = k + num;
triangles[t++] = k + 1;
triangles[t++] = k + 1 + num;
triangles[t++] = k + num;
}
else // Connecting start to end
{
triangles[t++] = k;
triangles[t++] = 0;
triangles[t++] = k + num;
triangles[t++] = 0;
triangles[t++] = num;
triangles[t++] = k + num;
}
// wallpapering the wall
var percentageOfWall = k / (float)num;
var c = bandLen * percentageOfWall;
uv[k] = new Vector2(c, 0);
uv[k + num] = new Vector2(c, 1);
}
mesh.vertices = vertices;
mesh.uv = uv;
mesh.triangles = triangles;
mesh.RecalculateNormals();
return(holeWalls);
}