/// <summary>
/// Building function as co-routine
/// </summary>
/// <param name="voxels">Storage instance including collected voxels</param>
/// <param name="bounds">Bounding box in absolute space</param>
/// <returns>Enumerator for co-routine processing</returns>
protected virtual IEnumerator CoBuild(Storage voxels, Bounds bounds)
{
// Check for given array
if (voxels != null)
{
// Create target file
var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write);
if (fileStream != null)
{
// Create steam writer instance
var streamWriter = new StreamWriter(fileStream);
if (streamWriter != null)
{
// Store file header
streamWriter.WriteLine("ply");
streamWriter.WriteLine("format ascii 1.0");
if (assetAuthor != null && assetAuthor.Length > 0)
{
streamWriter.WriteLine("comment Author: " + assetAuthor);
}
streamWriter.WriteLine("obj_info Generated by Voxels for Unity");
streamWriter.WriteLine("element vertex " + voxels.Count.ToString());
streamWriter.WriteLine("property float x");
streamWriter.WriteLine("property float y");
streamWriter.WriteLine("property float z");
streamWriter.WriteLine("property float red");
streamWriter.WriteLine("property float green");
streamWriter.WriteLine("property float blue");
streamWriter.WriteLine("property float alpha");
streamWriter.WriteLine("end_header");
Voxels.Storage.Iterator iterator = voxels.GetIterator();
Material material;
int x, y, z;
int voxelIndex = 0;
Vector3 factor = new Vector3(bounds.size.x / voxels.Width, bounds.size.y / voxels.Height, bounds.size.z / voxels.Depth);
// Store material colors of all input voxels
while ((material = iterator.GetNextMaterial(out x, out y, out z)) != null)
{
streamWriter.WriteLine((x * factor.x + bounds.min.x) + " " + (y * factor.y + bounds.min.y) + " " + (z * factor.z + bounds.min.z) + " " + material.color.r + " " + material.color.g + " " + material.color.b + " " + material.color.a);
++voxelIndex;
}
// Close file stream
streamWriter.Close();
streamWriter = null;
}
// Close file stream
fileStream.Close();
fileStream = null;
}
}
// Finish function
progress = 1;
yield return(null);
}
/// <summary>
/// Building function as co-routine
/// </summary>
/// <param name="voxels">Storage instance including collected voxels</param>
/// <param name="bounds">Bounding box in absolute space</param>
/// <returns>Enumerator for co-routine processing</returns>
protected virtual IEnumerator CoBuild(Storage voxels, Bounds bounds)
{
// Check for given array
if (voxels != null)
{
// Create target file
var fileStream = new BinaryWriter(File.Open(filePath, FileMode.OpenOrCreate));
if (fileStream != null)
{
// Resolution limit for file format
int maximumWidth = 256;
int maximumHeight = 256;
int maximumSlice = 256;
// Store file type identifier
fileStream.Write(new char[] { 'V', 'O', 'X', ' ' });
fileStream.Write((int)150);
// Begin main chunk
fileStream.Write(new char[] { 'M', 'A', 'I', 'N' });
fileStream.Write((int)0);
var sizePointer = fileStream.BaseStream.Position;
fileStream.Write((int)(sizeof(char) * 4 + sizeof(int) * 3));
// Write resolution
fileStream.Write(new char[] { 'S', 'I', 'Z', 'E' });
fileStream.Write((int)(sizeof(int) * 3));
fileStream.Write((int)0);
fileStream.Write((int)voxels.Width < maximumWidth ? voxels.Width : maximumWidth);
fileStream.Write((int)voxels.Height < maximumHeight ? voxels.Height : maximumHeight);
fileStream.Write((int)voxels.Depth < maximumSlice ? voxels.Depth : maximumSlice);
Material[] outputMaterials;
Dictionary <int, int> assignments;
var materialGroups = new Dictionary <Material, int>();
var materialsList = new List <Material>();
int materialsCount = 0;
Voxels.Storage.Iterator iterator = voxels.GetIterator();
Material material;
int x, y, z;
int voxelsNumber = 0;
int voxelsCount = 0;
// Interrupt co-routine
progress = 0;
yield return(null);
// Process materials of all input voxels
while ((material = iterator.GetNextMaterial(out x, out y, out z)) != null)
{
// Convert coordinates to format space
var column = voxels.Width - x - 1;
var line = voxels.Depth - z - 1;
var slice = y;
// Check if coordinate is supported by file format
if (column < maximumWidth && line < maximumHeight && slice < maximumSlice)
{
// Add material to list and hash table if it is new
if (!materialGroups.ContainsKey(material))
{
materialGroups.Add(material, materialsList.Count);
materialsList.Add(material);
++materialsCount;
}
// Increase number of voxels to store to file
++voxelsCount;
}
// Compute current progression
if (++voxelsNumber % 1000 == 0)
{
progress = (float)voxelsNumber / (float)voxels.Count * 0.25f;
yield return(null);
}
}
// Interrupt co-routine
progress = 0.25f;
yield return(null);
// Minimize number of colors to given limit
var materialReducer = new MaterialReducer(this, materialsList, 254);
if (materialReducer != null)
{
// Wait until reduction has been finished
float progress;
while ((progress = materialReducer.GetProgress()) < 1)
{
this.progress = progress * 0.5f + 0.25f;
yield return(null);
}
// Get reduced materials and assignment pointers from original ones
materialReducer.GetResult(out outputMaterials, out assignments);
}
else
{
outputMaterials = null;
assignments = null;
}
// Interrupt co-routine
progress = 0.75f;
yield return(null);
// Store voxels with assigned color index to file
fileStream.Write(new char[] { 'X', 'Y', 'Z', 'I' });
fileStream.Write((int)(sizeof(int) + sizeof(int) * voxelsCount));
fileStream.Write((int)0);
fileStream.Write((int)voxelsCount);
voxelsNumber = 0;
while ((material = iterator.GetNextMaterial(out x, out y, out z)) != null)
{
var column = voxels.Width - x - 1;
var line = voxels.Depth - z - 1;
var slice = y;
if (column < maximumWidth && line < maximumHeight && slice < maximumSlice)
{
int sourceIndex = materialGroups[material];
int targetIndex = assignments[sourceIndex];
fileStream.Write((byte)column);
fileStream.Write((byte)line);
fileStream.Write((byte)slice);
fileStream.Write((byte)(targetIndex + 1));
}
if (++voxelsNumber % 1000 == 0)
{
progress = (float)voxelsNumber / (float)voxels.Count * 0.25f + 0.75f;
yield return(null);
}
}
// Store material colors to file
fileStream.Write(new char[] { 'R', 'G', 'B', 'A' });
fileStream.Write((int)(sizeof(int) * 256));
fileStream.Write((int)0);
for (int index = 0; index < outputMaterials.Length; ++index)
{
material = outputMaterials[index];
fileStream.Write((byte)(material.color.r * 255 + 0.5f));
fileStream.Write((byte)(material.color.g * 255 + 0.5f));
fileStream.Write((byte)(material.color.b * 255 + 0.5f));
fileStream.Write((byte)(material.color.a * 255 + 0.5f));
}
// Fill unused colors
for (int index = outputMaterials.Length; index < 256; ++index)
{
fileStream.Write((uint)0xFF000000);
}
// Store data size into file
var endPointer = fileStream.BaseStream.Position;
fileStream.Seek((int)sizePointer, SeekOrigin.Begin);
fileStream.Write((int)(endPointer - sizePointer - sizeof(int)));
// Close file stream
fileStream.Close();
fileStream = null;
}
}
// Finish function
progress = 1;
yield return(null);
}
