/** Initializes a new OBJ Object with the given filename. */
public PShapeOBJ(PApplet parent, String filename) {
this(parent, parent.createReader(filename), getBasePath(parent, filename));
}
protected static void parseOBJ(
PApplet parent,
String path,
BufferedReader reader,
ArrayList<OBJFace> faces,
ArrayList<OBJMaterial> materials,
ArrayList<PVector> coords,
ArrayList<PVector> normals,
ArrayList<PVector> texcoords) {
Map<String, Integer> mtlTable = new HashMap<String, Integer>();
int mtlIdxCur = -1;
boolean readv, readvn, readvt;
try {
readv = readvn = readvt = false;
String line;
String gname = "object";
while ((line = reader.readLine()) != null) {
// Parse the line.
line = line.trim();
if (line.equals("") || line.indexOf('#') == 0) {
// Empty line of comment, ignore line
continue;
}
// The below patch/hack comes from Carlos Tomas Marti and is a
// fix for single backslashes in Rhino obj files
// BEGINNING OF RHINO OBJ FILES HACK
// Statements can be broken in multiple lines using '\' at the
// end of a line.
// In regular expressions, the backslash is also an escape
// character.
// The regular expression \\ matches a single backslash. This
// regular expression as a Java string, becomes "\\\\".
// That's right: 4 backslashes to match a single one.
while (line.contains("\\")) {
line = line.split("\\\\")[0];
final String s = reader.readLine();
if (s != null) line += s;
}
// END OF RHINO OBJ FILES HACK
String[] parts = line.split("\\s+");
// if not a blank line, process the line.
if (parts.length > 0) {
if (parts[0].equals("v")) {
// vertex
PVector tempv =
new PVector(
Float.valueOf(parts[1]).floatValue(),
Float.valueOf(parts[2]).floatValue(),
Float.valueOf(parts[3]).floatValue());
coords.add(tempv);
readv = true;
} else if (parts[0].equals("vn")) {
// normal
PVector tempn =
new PVector(
Float.valueOf(parts[1]).floatValue(),
Float.valueOf(parts[2]).floatValue(),
Float.valueOf(parts[3]).floatValue());
normals.add(tempn);
readvn = true;
} else if (parts[0].equals("vt")) {
// uv, inverting v to take into account Processing's inverted Y axis
// with respect to OpenGL.
PVector tempv =
new PVector(
Float.valueOf(parts[1]).floatValue(), 1 - Float.valueOf(parts[2]).floatValue());
texcoords.add(tempv);
readvt = true;
} else if (parts[0].equals("o")) {
// Object name is ignored, for now.
} else if (parts[0].equals("mtllib")) {
if (parts[1] != null) {
String fn = parts[1];
if (fn.indexOf(File.separator) == -1 && !path.equals("")) {
// Relative file name, adding the base path.
fn = path + File.separator + fn;
}
BufferedReader mreader = parent.createReader(fn);
if (mreader != null) {
parseMTL(parent, path, mreader, materials, mtlTable);
mreader.close();
}
}
} else if (parts[0].equals("g")) {
gname = 1 < parts.length ? parts[1] : "";
} else if (parts[0].equals("usemtl")) {
// Getting index of current active material (will be applied on
// all subsequent faces).
if (parts[1] != null) {
String mtlname = parts[1];
if (mtlTable.containsKey(mtlname)) {
Integer tempInt = mtlTable.get(mtlname);
mtlIdxCur = tempInt.intValue();
} else {
mtlIdxCur = -1;
}
}
} else if (parts[0].equals("f")) {
// Face setting
OBJFace face = new OBJFace();
face.matIdx = mtlIdxCur;
face.name = gname;
for (int i = 1; i < parts.length; i++) {
String seg = parts[i];
if (seg.indexOf("/") > 0) {
String[] forder = seg.split("/");
if (forder.length > 2) {
// Getting vertex and texture and normal indexes.
if (forder[0].length() > 0 && readv) {
face.vertIdx.add(Integer.valueOf(forder[0]));
}
if (forder[1].length() > 0 && readvt) {
face.texIdx.add(Integer.valueOf(forder[1]));
}
if (forder[2].length() > 0 && readvn) {
face.normIdx.add(Integer.valueOf(forder[2]));
}
} else if (forder.length > 1) {
// Getting vertex and texture/normal indexes.
if (forder[0].length() > 0 && readv) {
face.vertIdx.add(Integer.valueOf(forder[0]));
}
if (forder[1].length() > 0) {
if (readvt) {
face.texIdx.add(Integer.valueOf(forder[1]));
} else if (readvn) {
face.normIdx.add(Integer.valueOf(forder[1]));
}
}
} else if (forder.length > 0) {
// Getting vertex index only.
if (forder[0].length() > 0 && readv) {
face.vertIdx.add(Integer.valueOf(forder[0]));
}
}
} else {
// Getting vertex index only.
if (seg.length() > 0 && readv) {
face.vertIdx.add(Integer.valueOf(seg));
}
}
}
faces.add(face);
}
}
}
if (materials.size() == 0) {
// No materials definition so far. Adding one default material.
OBJMaterial defMtl = new OBJMaterial();
materials.add(defMtl);
}
} catch (Exception e) {
e.printStackTrace();
}
}