public static BlockFacing FromNormal(Vec3f vec)
{
float smallestAngle = GameMath.PI;
BlockFacing facing = null;
for (int i = 0; i < ALLFACES.Length; i++)
{
BlockFacing f = ALLFACES[i];
float angle = (float)Math.Acos(f.Normalf.Dot(vec));
if (angle < smallestAngle)
{
smallestAngle = angle;
facing = f;
}
}
return(facing);
}
static ShapeUtil()
{
cubicShellNormalizedVectors = new Vec3f[16][];
int[] ab = new int[2];
for (int r = 1; r < 16; r++)
{
cubicShellNormalizedVectors[r] = new Vec3f[(2 * r + 1) * (2 * r + 1) * 6];
int j = 0;
foreach (BlockFacing facing in BlockFacing.ALLFACES)
{
for (ab[0] = -r; ab[0] <= r; ab[0]++)
{
for (ab[1] = -r; ab[1] <= r; ab[1]++)
{
Vec3f pos = new Vec3f(facing.Normali.X * r, facing.Normali.Y * r, facing.Normali.Z * r);
int l = 0;
if (pos.X == 0)
{
pos.X = ab[l++];
}
if (pos.Y == 0)
{
pos.Y = ab[l++];
}
if (l < 2 && pos.Z == 0)
{
pos.Z = ab[l++];
}
cubicShellNormalizedVectors[r][j++] = pos.Normalize();
}
}
}
}
}
/// <summary>
/// Sets the vector to the coordinates of given vector
/// </summary>
/// <param name="vec"></param>
public void Set(Vec3f vec)
{
this.X = (float)vec.X;
this.Y = (float)vec.Y;
this.Z = (float)vec.Z;
}
/// <summary>
/// Adds both vectors into a new vector. Both source vectors remain unchanged.
/// </summary>
/// <param name="vec"></param>
/// <returns></returns>
public Vec3f AddCopy(Vec3f vec)
{
return(new Vec3f(X + vec.X, Y + vec.Y, Z + vec.Z));
}
/// <summary>
/// Creates the cross product from a and b and sets own values accordingly
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
public void Cross(Vec3f a, Vec4f b)
{
X = a.Y * b.Z - a.Z * b.Y;
Y = a.Z * b.X - a.X * b.Z;
Z = a.X * b.Y - a.Y * b.X;
}
/// <summary>
/// Returns the dot product with given vector
/// </summary>
/// <param name="a"></param>
/// <returns></returns>
public float Dot(Vec3f a)
{
return(X * a.X + Y * a.Y + Z * a.Z);
}
public Vec3d AddCopy(Vec3f a)
{
return(new Vec3d(X + a.X, Y + a.Y, Z + a.Z));
}
private BlockFacing(string code, byte flag, int index, int oppositeIndex, int horizontalAngleIndex, Vec3i facingVector, Vec3f planeCenter, EnumAxis axis, Cuboidf plane)
{
this.index = index;
this.meshDataIndex = (byte)(index + 1);
this.horizontalAngleIndex = horizontalAngleIndex;
this.flag = flag;
this.code = code;
this.oppositeIndex = oppositeIndex;
this.normali = facingVector;
this.normalf = new Vec3f(facingVector.X, facingVector.Y, facingVector.Z);
this.normald = new Vec3d((double)facingVector.X, (double)facingVector.Y, (double)facingVector.Z);
this.plane = plane;
normalPacked = NormalUtil.PackNormal(normalf.X, normalf.Y, normalf.Z);
normalb = (byte)(
(axis == EnumAxis.Z ? 1 : 0) << 0
| (facingVector.Z < 0 ? 1 : 0) << 1
| (axis == EnumAxis.Y ? 1 : 0) << 2
| (facingVector.Y < 0 ? 1 : 0) << 3
| (axis == EnumAxis.X ? 1 : 0) << 4
| (facingVector.X < 0 ? 1 : 0) << 5
);
normalPackedFlags = VertexFlags.PackNormal(normalf);
this.planeCenter = planeCenter;
this.axis = axis;
}