Android Open Source - TreeFrogEngine Model Loader

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Back to project page TreeFrogEngine.

License

The source code is released under:

MIT License

Java Source Code

package com.discretesoftworks.framework;
/*w ww. j  a  v  a 2  s.c  om*/
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Hashtable;

import android.content.res.AssetManager;
import android.graphics.BitmapFactory;

public class ModelLoader {
  public static String convertStreamToString(InputStream is) {
    java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
    return s.hasNext() ? s.next() : "";
  }
  public static RenderModel loadOBJ(RenderModel object, String filename, AssetManager assets) throws IOException {
    String file = convertStreamToString(assets.open(filename));
    String[] lines = file.split("\\r?\\n");
    String line;
    
    Sprite sprite = null;
    
    ArrayList<Float> positionCoords = new ArrayList<Float>();
    ArrayList<Float> textureCoords = new ArrayList<Float>();
    ArrayList<Float> normalCoords = new ArrayList<Float>();
    ArrayList<Float> verticies = new ArrayList<Float>();
    ArrayList<Short> indicies = new ArrayList<Short>();
    Hashtable<Long, Short> indiciesIndexMap = new Hashtable<Long, Short>();
    
    for (int i = 0; i < lines.length; i++) {
      line = lines[i];
      switch(line.charAt(0)) {
      case '#':
        System.out.println("Comment!");
        break;
      case 'v':
        //Vertex, or texture coord, or vertex normal
        String[] coords = line.split(" ");
        if (line.charAt(1) == 't') {
          //texture
          textureCoords.add(Float.parseFloat(coords[1]));
          textureCoords.add(-Float.parseFloat(coords[2]));
        } else if (line.charAt(1) == 'n') {
          //normal
          normalCoords.add(Float.parseFloat(coords[1]));
          normalCoords.add(-Float.parseFloat(coords[3]));
          //Out of order to make z up
          normalCoords.add(Float.parseFloat(coords[2]));
        } else if (line.charAt(1) == 'p') {
          //Parameter Space
        } else {
          //Regular vertex
          positionCoords.add(Float.parseFloat(coords[1]));
          positionCoords.add(-Float.parseFloat(coords[3]));
          //Out of order to make z be up
          positionCoords.add(Float.parseFloat(coords[2]));
        }
        break;
      case 'f':
        //face
        String[] tripIndic = line.split(" ");
        for (short j = 1; j < 4; j++) {
          short positionIndex = (short)(Short.parseShort(tripIndic[j].split("/")[0]) - 1);
          short texIndex = (short)(Short.parseShort(tripIndic[j].split("/")[1]) - 1);
          short normIndex;
          if (tripIndic[j].split("/").length == 3)
            normIndex = (short)(Short.parseShort(tripIndic[j].split("/")[2]) - 1);
          else
            normIndex = 0;
          
          Short vertexIndex = indiciesIndexMap.get(((long)positionIndex)|((long)texIndex)<<16|((long)normIndex)<<32);
          if (vertexIndex == null) {
            vertexIndex = (short)(verticies.size()/8);
            indiciesIndexMap.put(((long)positionIndex)|((long)texIndex)<<16|((long)normIndex)<<32, vertexIndex);
            verticies.add(positionCoords.get(positionIndex*3));
            verticies.add(positionCoords.get(positionIndex*3+1));
            verticies.add(positionCoords.get(positionIndex*3+2));
            
            if (normalCoords.size() == 0) {
              normalCoords.add(1f);
              normalCoords.add(1f);
              normalCoords.add(1f);
            }
            verticies.add(normalCoords.get(normIndex*3));
            verticies.add(normalCoords.get(normIndex*3+1));
            verticies.add(normalCoords.get(normIndex*3+2));

            
            verticies.add(textureCoords.get(texIndex*2));
            verticies.add(textureCoords.get(texIndex*2+1));
          }
          indicies.add(vertexIndex);
        }
        
        break;
      case 'm':
      {
        //mtllib
        String[] mtllibFileName = line.split(" ");
        String[] mtllibFile = convertStreamToString(assets.open(mtllibFileName[1])).split("\\r?\\n");
        String texFileName = "";
        String[] mtllibFileLine = null;
        for (int j = 0; j < mtllibFile.length; j++) {
          mtllibFileLine = mtllibFile[j].split(" ");
          if (mtllibFileLine[0].equals("map_Kd")) {
            texFileName = mtllibFileLine[1];
            break;
          }
        }
        sprite = new Sprite(BitmapFactory.decodeStream(assets.open(texFileName)),1);
      }
        break;
      case 'u':
        //usemtl
        break;
      case 'o':
        //object
        break;
      default:
        //s off, etc
          
      }
    }
    float[] verticiesArray = new float[(verticies.size()/8)*3];
    float[] normalsArray = new float[(verticies.size()/8)*3];
    float[] texArray = new float[(verticies.size()/8)*2];
    short[] indiciesArray = new short[indicies.size()];

    for (int i = 0; i < indicies.size(); i++) {
      indiciesArray[i] = indicies.get(i);
      verticiesArray[indicies.get(i)*3] = verticies.get(indicies.get(i)*8);
      verticiesArray[indicies.get(i)*3+1] = verticies.get(indicies.get(i)*8+1);
      verticiesArray[indicies.get(i)*3+2] = verticies.get(indicies.get(i)*8+2);
      
      normalsArray[indicies.get(i)*3] = verticies.get(indicies.get(i)*8+3);
      normalsArray[indicies.get(i)*3+1] = verticies.get(indicies.get(i)*8+4);
      normalsArray[indicies.get(i)*3+2] = verticies.get(indicies.get(i)*8+5);
      
      texArray[indicies.get(i)*2] = verticies.get(indicies.get(i)*8+6);
      texArray[indicies.get(i)*2+1] = verticies.get(indicies.get(i)*8+7);
    }
    object.setupModel(verticiesArray, normalsArray, texArray, indiciesArray);
    object.setSprite(sprite);
    
    return object;
  }

}

Java Source Code List

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