private static Vector3[] MakeFaceNormals(CullingFaces face, int x, int y, int z)
{
var q = GetRotation(face);
var r = new[]
{
q *new Vector3(-.5f, .5f, -.5f).normalized,
q *new Vector3(.5f, .5f, -.5f).normalized,
q *new Vector3(-.5f, -.5f, -.5f).normalized,
q *new Vector3(.5f, -.5f, -.5f).normalized,
// q*Vector3.back,
// q*Vector3.back,
// q*Vector3.back,
// q*Vector3.back
};
return(r);
}
public override Vector2[] BuildUV(ref int count, ref CullingFaces c, ref Voxel v, int x, int y, int z)
{
var l = 4 * (6 - ((byte)c).PopCount());
count += l;
var r = new Vector2[l];
for (int i = r.Length - 4; i >= 0; i -= 4)
{
r [i + 0] = new Vector2(0, 1);
r [i + 1] = new Vector2(1, 1);
r [i + 2] = new Vector2(0, 0);
r [i + 3] = new Vector2(1, 0);
}
return(r);
}
private static Quaternion GetRotation(CullingFaces face)
{
switch (face)
{
case CullingFaces.West:
return(Quaternion.Euler(0, 90, 0));
case CullingFaces.North:
return(Quaternion.Euler(0, 180, 0));
case CullingFaces.East:
return(Quaternion.Euler(0, 270, 0));
case CullingFaces.Up:
return(Quaternion.Euler(90, 0, 0));
case CullingFaces.Down:
return(Quaternion.Euler(-90, 0, 0));
}
return(Quaternion.identity);
}
private static int[] MakeTriangles(CullingFaces face, ref int start)
{
var count = 6 * (6 - ((byte)face).PopCount());
var triangles = new int[count];
var index = 0;
foreach (var f in Enum.GetValues(typeof(CullingFaces)))
{
if (((byte)(CullingFaces)f).PopCount() != 1)
{
continue;
}
if (!face.HasFlag((CullingFaces)f))
{
Array.Copy(MakeFaceTriangles((CullingFaces)f, start), 0, triangles, index, 6);
index += 6;
start += 4;
}
}
return(triangles);
}
public override int[] BuildTrianlges(ref int count, ref CullingFaces c, ref Voxel v, ref int triangleIndex, int x, int y, int z)
{
var l = 6 * (6 - ((byte)c).PopCount());
count += l;
var triangles = new int[l];
var index = 0;
for (byte f = 1 << 0; f <= (byte)CullingFaces.Down; f = (byte)(f << 1))
{
if (((byte)f).PopCount() != 1)
{
continue;
}
if (!c.HasFlag(f))
{
Array.Copy(MakeFaceTriangles((CullingFaces)f, triangleIndex), 0, triangles, index, 6);
index += 6;
triangleIndex += 4;
}
}
return(triangles);
}
public virtual Vector2[] BuildUV2(ref int count, ref CullingFaces c, ref Voxel v, int x, int y, int z)
{
throw new NotImplementedException();
}
public virtual Color[] BuildColors(
ref int count, ref CullingFaces c, ref Voxel v, int x, int y, int z)
{
throw new NotImplementedException();
}
public abstract int[] BuildTrianlges(
ref int count, ref CullingFaces c, ref Voxel v, ref int triangleIndex, int x, int y, int z);
public abstract Vector3[] BuildVertices(
ref int count, ref CullingFaces c, ref Voxel v, int x, int y, int z);
private static int[] MakeFaceTriangles(CullingFaces face, int i)
{
return(new[] { i + 0, i + 1, i + 2, i + 3, i + 2, i + 1 });
}
