Android Open Source - ScalAR Mtl Parser

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
  Copyright (C) 2010  Tobias Domhan/*from   w  w w.j a va 2  s.  c om*/

    This file is part of AndObjViewer.

    AndObjViewer is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    AndObjViewer is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with AndObjViewer.  If not, see <http://www.gnu.org/licenses/>.
 
 */
package edu.dhbw.andobjviewer.parser;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.regex.Pattern;

import edu.dhbw.andobjviewer.models.Material;
import edu.dhbw.andobjviewer.models.Model;
import edu.dhbw.andobjviewer.util.BaseFileUtil;


import android.R;
import android.graphics.BitmapFactory;


public class MtlParser { 

  private BaseFileUtil fileUtil;
  
  public MtlParser(Model model, BaseFileUtil fileUtil) {
    this.fileUtil = fileUtil;
  }

  /**
   * parses the given material definition
   * @param line
   */
  public void parse(Model model, BufferedReader is) {
    Material curMat = null;
    int lineNum = 1;
    String line;
    try {
      for (line = is.readLine(); 
      line != null; 
      line = is.readLine(), lineNum++)
      {
        line = Util.getCanonicalLine(line).trim();
        if (line.length() > 0) {
          if (line.startsWith("newmtl ")) {
            // specular color
            String mtlName = line.substring(7);
            curMat = new Material(mtlName);
            model.addMaterial(curMat);
          } else if(curMat == null) {
            //if the current material is not set, there is no need to parse anything
          } else if (line.startsWith("# ")) {
            //ignore comments
          } else if (line.startsWith("Ka ")) {
            //ambient color
            String endOfLine = line.substring(3);
            curMat.setAmbient(parseTriple(endOfLine));
          } else if (line.startsWith("Kd ")) {
            // diffuse color
            String endOfLine = line.substring(3);
            curMat.setDiffuse(parseTriple(endOfLine));
          } else if (line.startsWith("Ks ")) {
            // specular color
            String endOfLine = line.substring(3);
            curMat.setSpecular(parseTriple(endOfLine));
          } else if (line.startsWith("Ns ")) {
            // specular color
            String endOfLine = line.substring(3);
            curMat.setShininess(Float.parseFloat(endOfLine));
          } else if (line.startsWith("Tr ")) {
            // specular color
            String endOfLine = line.substring(3);
            curMat.setAlpha(Float.parseFloat(endOfLine));
          } else if (line.startsWith("d ")) {
            // specular color
            String endOfLine = line.substring(2);
            curMat.setAlpha(Float.parseFloat(endOfLine));
          } else if(line.startsWith("map_Kd ")) {
            //limited texture support
            String imageFileName = line.substring(7);
            curMat.setFileUtil(fileUtil);
            curMat.setBitmapFileName(imageFileName);
          } else if(line.startsWith("mapKd ")) {
            //limited texture support
            String imageFileName = line.substring(6);
            curMat.setFileUtil(fileUtil);
            curMat.setBitmapFileName(imageFileName);
          }
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  
  private static float[] parseTriple(String str) {
    String[] colorVals = str.split(" ");
    float[] colorArr = new float[]{
        Float.parseFloat(colorVals[0]),
        Float.parseFloat(colorVals[1]),
        Float.parseFloat(colorVals[2])};
    return colorArr;
    
  }
  
}

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