/// <summary>
/// Parse the obj file to make the data useable
/// </summary>
/// <param name="file">File to parse</param>
/// <param name="parseMtl">Parse the mtl file directly</param>
/// <returns></returns>
public static ObjData ParseObj(string file, bool parseMtl = true)
{
string[] lines = GenericUtils.RemoveBlankSpaces(FileUtilsShared.ReadFile(file)); // Read the file and remove blankspaces
if (lines != null)
{
UpdateParseLineGroup(lines);
AllVerticesDataObj verticesData = new AllVerticesDataObj(); // To store the vertices data
// Store all the other data to parse
List <Tuple <string, string> > listKeysValues = GetListKeysValues(lines, verticesData);
ObjData objData = new ObjData(file, verticesData.MtlLib);
lines = null; // To let the garbage collector free the file from memory
int i = 0;
int length = listKeysValues.Count;
while (i < length)
{
Tuple <string, string> keyValue = listKeysValues[i];
if (keyValue != null)
{
if (isObjectGroup(keyValue.Item1))
{
int objectStart = i;
int objectEnd = GetIndexEnd(listKeysValues, length, objectStart);
if (objectEnd != -1)
{
objData.ObjectsList.Add(ObjectData(listKeysValues, verticesData, objectStart, objectEnd));
i = objectEnd; // Set to next object
continue;
}
}
}
i++; // Unless error or final line
}
if (parseMtl)
{
objData.UpdateMtlData();
}
return(objData);
}
return(null);
}
/// <summary>
/// Store the f, v, vt and vn lines into the object
/// </summary>
/// <param name="value"></param>
/// <param name="objectObj"></param>
/// <param name="allVertices"></param>
/// <param name="indexesObj"></param>
private static void VerticeData(string value, ObjectObj objectObj, AllVerticesDataObj allVertices, LocalIndexesObj indexesObj)
{
VertIndexesObj vertIndexes = new VertIndexesObj();
foreach (string indexes in ObjUtils.SplitVertData(value))
{
VertIndexObj vertIndex = new VertIndexObj();
string[] indexList = ObjUtils.SplitIndexes(indexes);
int length = indexList.Length;
for (int i = 0; i < length; i++)
{
int index = 0;
if (indexList[i] != "") // the vt line can be empty
{
if (Int32.TryParse(indexList[i], out int tmpIndex)) // Get the index
{
index = tmpIndex;
}
}
if (i == 0) // v
{
if (index != 0)
{
vertIndex.V = indexesObj.vIndex;
string vLine = allVertices.GetVIndex(index - 1); // Obj index start at 1
if (vLine != null)
{
objectObj.VerticesList.Add(new Point(vLine));
indexesObj.vIndex++;
}
}
}
else if (i == 1) // vt
{
if (index != 0)
{
vertIndex.Vt = indexesObj.vtIndex;
string vtLine = allVertices.GetVtIndex(index - 1); // Obj index start at 1
if (vtLine != null)
{
objectObj.UVsList.Add(new UVCoordinates(vtLine));
indexesObj.vtIndex++;
}
}
}
else if (i == 2) // vn
{
if (index != 0)
{
vertIndex.Vn = indexesObj.vnIndex;
string vnLine = allVertices.GetVnIndex(index - 1); // Obj index start at 1
if (vnLine != null)
{
objectObj.NormalsList.Add(new Vector(vnLine));
indexesObj.vnIndex++;
}
}
}
}
vertIndexes.VertIndexList.Add(vertIndex);
}
objectObj.VertIndexesList.Add(vertIndexes);
}
/// <summary>
/// Store every line of the file as a set of key and value for easier access
/// </summary>
/// <param name="lines"></param>
/// <param name="verticesData"></param>
/// <returns></returns>
private static List <Tuple <string, string> > GetListKeysValues(string[] lines, AllVerticesDataObj verticesData)
{
int length = lines.Length;
List <Tuple <string, string> > listKeysValues = new List <Tuple <string, string> >();
for (int i = 0; i < length; i++) // Store the useful data in a key value list
{
string line = lines[i];
if (!string.IsNullOrEmpty(line)) // If not empty line nor null
{
Tuple <string, string> keyValue = GenericUtils.GetKeyValueFromSplit(line.Trim());
if (keyValue != null)
{
string key = keyValue.Item1;
string value = keyValue.Item2.TrimEnd('\0').Trim(); // Remove the null character and any blank space
// Remove the null character and any blank space
if (key == "mtllib")
{
verticesData.MtlLib = value;
}
else if (key == "v")
{
verticesData.V.Add(value);
}
else if (key == "vt")
{
verticesData.Vt.Add(value);
}
else if (key == "vn")
{
verticesData.Vn.Add(value);
}
else
{
listKeysValues.Add(keyValue);
}
}
}
}
listKeysValues.Add(null); // Insert an empty line
return(listKeysValues);
}
/// <summary>
/// Return one object from the obj file
/// </summary>
/// <param name="listKeysValues"></param>
/// <param name="allVertices"></param>
/// <param name="startIndex"></param>
/// <param name="endIndex"></param>
/// <returns></returns>
private static ObjectObj ObjectData(List <Tuple <string, string> > listKeysValues, AllVerticesDataObj allVertices,
int startIndex, int endIndex)
{
LocalIndexesObj indexesObj = new LocalIndexesObj();
ObjectObj objectObj = new ObjectObj();
int i = startIndex;
while (i < endIndex)
{
Tuple <string, string> keyValue = listKeysValues[i];
if (keyValue != null)
{
string key = keyValue.Item1;
string value = keyValue.Item2.TrimEnd('\0').Trim(); // Remove the null character and any blank space
if (ObjUtils.IsVertData(key)) // f
{
VerticeData(value, objectObj, allVertices, indexesObj);
}
else // Other key (o, g, s, usemtl)
{
switch (key)
{
case "usemtl":
objectObj.MaterialName = value;
break;
case "o":
objectObj.ObjectName = value;
break;
case "g":
objectObj.GroupName = value;
break;
case "s":
if (value != "off")
{
if (Int32.TryParse(value, out int s))
{
objectObj.Smooth = s;
}
}
break;
default:
break;
}
}
}
i++;
}
return(objectObj);
}
