public bool Act(double x, double y, double z, ref Voxel voxel)
    {
        double distance;
        var    pos = new Vector3d(x, y, z);
        var    orthogonalOntoLine = UMath.OrthogonalProjectionOntoLineNormalized(pos, start, direction);

        var orthoDistanceToStart = Vector3d.Dot(direction, orthogonalOntoLine - start);

        if (orthoDistanceToStart > 0 && orthoDistanceToStart < length)
        {
            distance = (orthogonalOntoLine - pos).Magnitude;
        }
        else
        {
            distance = Math.Min((start - pos).Magnitude, (end - pos).Magnitude);
        }

        if (dig)
        {
            voxel.Value = Math.Max(voxel.Value, (radius - distance) * voxelSizeInverse);
        }
        else
        {
            voxel.Value = Math.Min(voxel.Value, (distance - radius) * voxelSizeInverse);
        }

        if (voxelType != null && distance <= radius + 0.1)
        {
            voxel.VoxelType = voxelType;
            return(true);
        }

        return(false);
    }