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VoxHelper.cs
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VoxHelper.cs
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// Copyright (C) 2022 Maxim Gumin, The MIT License (MIT)
using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
static class VoxHelper
{
public static (int[], int, int, int) LoadVox(string filename)
{
try
{
using FileStream file = File.Open(filename, FileMode.Open);
var stream = new BinaryReader(file);
int[] result = null;
int MX = -1, MY = -1, MZ = -1;
string magic = new(stream.ReadChars(4));
int version = stream.ReadInt32();
while (stream.BaseStream.Position < stream.BaseStream.Length)
{
byte[] bt = stream.ReadBytes(1);
char head = Encoding.ASCII.GetChars(bt)[0];
if (head == 'S')
{
string tail = Encoding.ASCII.GetString(stream.ReadBytes(3));
if (tail != "IZE") continue;
int chunkSize = stream.ReadInt32();
stream.ReadBytes(4);
//Console.WriteLine("found SIZE chunk");
MX = stream.ReadInt32();
MY = stream.ReadInt32();
MZ = stream.ReadInt32();
stream.ReadBytes(chunkSize - 4 * 3);
//Console.WriteLine($"size = ({MX}, {MY}, {MZ})");
}
else if (head == 'X')
{
string tail = Encoding.ASCII.GetString(stream.ReadBytes(3));
if (tail != "YZI") continue;
if (MX <= 0 || MY <= 0 || MZ <= 0) return (null, MX, MY, MZ);
result = new int[MX * MY * MZ];
for (int i = 0; i < result.Length; i++) result[i] = -1;
//Console.WriteLine("found XYZI chunk");
stream.ReadBytes(8);
int numVoxels = stream.ReadInt32();
//Console.WriteLine($"number of voxels = {numVoxels}");
for (int i = 0; i < numVoxels; i++)
{
byte x = stream.ReadByte();
byte y = stream.ReadByte();
byte z = stream.ReadByte();
byte color = stream.ReadByte();
result[x + y * MX + z * MX * MY] = color;
//Console.WriteLine($"adding voxel {x} {y} {z} of color {color}");
}
}
}
file.Close();
return (result, MX, MY, MZ);
}
catch (Exception) { return (null, -1, -1, -1); }
}
static void WriteString(this BinaryWriter stream, string s) { foreach (char c in s) stream.Write(c); }
public static void SaveVox(byte[] state, byte MX, byte MY, byte MZ, int[] palette, string filename)
{
List<(byte, byte, byte, byte)> voxels = new();
for (byte z = 0; z < MZ; z++) for (byte y = 0; y < MY; y++) for (byte x = 0; x < MX; x++)
{
int i = x + y * MX + z * MX * MY;
byte v = state[i];
if (v != 0) voxels.Add((x, y, z, (byte)(v + 1)));
}
FileStream file = File.Open(filename, FileMode.Create);
using BinaryWriter stream = new(file);
stream.WriteString("VOX ");
stream.Write(150);
stream.WriteString("MAIN");
stream.Write(0);
stream.Write(1092 + voxels.Count * 4);
stream.WriteString("PACK");
stream.Write(4);
stream.Write(0);
stream.Write(1);
stream.WriteString("SIZE");
stream.Write(12);
stream.Write(0);
stream.Write((int)MX);
stream.Write((int)MY);
stream.Write((int)MZ);
stream.WriteString("XYZI");
stream.Write(4 + voxels.Count * 4);
stream.Write(0);
stream.Write(voxels.Count);
foreach (var (x, y, z, color) in voxels)
{
stream.Write(x);
//stream.Write((byte)(size.y - v.y - 1));
stream.Write(y);
stream.Write(z);
stream.Write(color);
}
stream.WriteString("RGBA");
stream.Write(1024);
stream.Write(0);
foreach (int c in palette)
{
//(byte R, byte G, byte B) = c.ToTuple();
stream.Write((byte)((c & 0xff0000) >> 16));
stream.Write((byte)((c & 0xff00) >> 8));
stream.Write((byte)(c & 0xff));
stream.Write((byte)0);
}
for (int i = palette.Length; i < 255; i++)
{
stream.Write((byte)(0xff - i - 1));
stream.Write((byte)(0xff - i - 1));
stream.Write((byte)(0xff - i - 1));
stream.Write((byte)(0xff));
}
stream.Write(0);
file.Close();
}
}