MtlReader.java

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 *
 *  - Redistributions of source code must retain the above copyright
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 *    the documentation and/or other materials provided with the distribution.
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 *    contributors may be used to endorse or promote products derived
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package eu.mihosoft.vrl.v3d.ext.openjfx.importers.obj;
 
import static eu.mihosoft.vrl.v3d.ext.openjfx.importers.obj.ObjImporter.log;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.scene.image.Image;
import javafx.scene.paint.Color;
import javafx.scene.paint.Material;
import javafx.scene.paint.PhongMaterial;
 
 
// TODO: Auto-generated Javadoc
public class MtlReader {
 
    private String baseUrl;
 
    public MtlReader(String filename, String parentUrl) {
        baseUrl = parentUrl.substring(0,parentUrl.lastIndexOf('/')+1);
        String fileUrl = baseUrl + filename;
        try {
            URL mtlUrl = new URL(fileUrl);
            log("Reading material from filename = " + mtlUrl);
            read(mtlUrl.openStream());
        } catch (FileNotFoundException ex) {
            System.err.println("No material file found for obj. ["+fileUrl+"]");
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
    
    public MtlReader(InputStream stream) {
 
        try {
            log("Reading material from stream");
            read(stream);
        } catch (FileNotFoundException ex) {
            System.err.println("No material file found for obj. [stream]");
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
 
    private Map<String, Material> materials = new HashMap<>();
    
    private PhongMaterial material = new PhongMaterial();
    
    private boolean modified = false;
 
    private void read(InputStream inputStream) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
        String line;
        String name = "default";
        while ((line = br.readLine()) != null) {
            try {
                if (line.isEmpty() || line.startsWith("#")) {
                    // comments and empty lines are ignored
                } else if (line.startsWith("newmtl ")) {
                    addMaterial(name);
                    name = line.substring("newmtl ".length());
                } else if (line.startsWith("Kd ")) {
                    material.setDiffuseColor(readColor(line.substring(3)));
                    modified = true;
                } else if (line.startsWith("Ks ")) {
                    material.setSpecularColor(readColor(line.substring(3)));
                    modified = true;
                } else if (line.startsWith("Ns ")) {
                    material.setSpecularPower(Double.parseDouble(line.substring(3)));
                    modified = true;
                } else if (line.startsWith("map_Kd ")) {
                    material.setDiffuseColor(Color.WHITE);
                    material.setDiffuseMap(loadImage(line.substring("map_Kd ".length())));
//                    material.setSelfIlluminationMap(loadImage(line.substring("map_Kd ".length())));
//                    material.setSpecularColor(Color.WHITE);
                    modified = true;
                    //            } else if (line.startsWith("illum ")) {
                    //                int illumNo = Integer.parseInt(line.substring("illum ".length()));
                    /*
                        0    Color on and Ambient off 
                        1    Color on and Ambient on 
                        2    Highlight on 
                        3    Reflection on and Ray trace on 
                        4    Transparency: Glass on 
                             Reflection: Ray trace on 
                        5    Reflection: Fresnel on and Ray trace on 
                        6    Transparency: Refraction on 
                             Reflection: Fresnel off and Ray trace on 
                        7    Transparency: Refraction on 
                             Reflection: Fresnel on and Ray trace on 
                        8    Reflection on and Ray trace off 
                        9    Transparency: Glass on 
                             Reflection: Ray trace off 
                        10   Casts shadows onto invisible surfaces 
                     */
                } else {
                    log("material line ignored for " + name + ": " + line);
                }
            } catch (Exception ex) {
                Logger.getLogger(MtlReader.class.getName()).log(Level.SEVERE, "Failed to parse line:" + line, ex);
            }
        }
        addMaterial(name);
    }
 
    private void addMaterial(String name) {
        if (modified) {
            if (!materials.containsKey(name)) {
                materials.put(name, material);
            } else {
                log("This material is already added. Ignoring " + name);
            }
            material = new PhongMaterial(Color.WHITE);
        }
    }
 
    private Color readColor(String line) {
        String[] split = line.trim().split(" +");
        float red = Float.parseFloat(split[0]);
        float green = Float.parseFloat(split[1]);
        float blue = Float.parseFloat(split[2]);
        return Color.color(red, green, blue);
    }
 
    private Image loadImage(String filename) {
        filename = baseUrl + filename;
        log("Loading image from " + filename);
        Image image = new Image(filename);
        return new Image(filename);
    }
 
    public Map<String, Material> getMaterials() {
        return Collections.unmodifiableMap(materials);
    }
}