OBJ File reader implementation.

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/Panel.java

@@ -115,9 +115,9 @@ public class Panel extends JPanel implements Runnable {
 
 
             triTranslated = (Triangle)triRotatedZX.clone();
-            triTranslated.A.z=triRotatedZX.A.z+3f;
-            triTranslated.B.z=triRotatedZX.B.z+3f;
-            triTranslated.C.z=triRotatedZX.C.z+3f;
+            triTranslated.A.z=triRotatedZX.A.z+6f;
+            triTranslated.B.z=triRotatedZX.B.z+6f;
+            triTranslated.C.z=triRotatedZX.C.z+6f;
 
             Vector3f normal=new Vector3f(),line1=new Vector3f(),line2=new Vector3f();
             line1.x=triTranslated.B.x-triTranslated.A.x;
@@ -142,7 +142,7 @@ public class Panel extends JPanel implements Runnable {
                 l = (float)Math.sqrt(lightDir.x*lightDir.x+lightDir.y*lightDir.y+lightDir.z*lightDir.z);
                 lightDir.x/=l; lightDir.y/=l; lightDir.z/=l;
 
-                float dp = normal.x*lightDir.x+normal.y*lightDir.y+normal.z*lightDir.z;
+                float dp = Math.abs(normal.x*lightDir.x+normal.y*lightDir.y+normal.z*lightDir.z);
 
                 Matrix.MultiplyMatrixVector(triTranslated.A, triProjected.A, SigRenderer.matProj);
                 Matrix.MultiplyMatrixVector(triTranslated.B, triProjected.B, SigRenderer.matProj);

src/sig/SigRenderer.java

@@ -6,10 +6,12 @@ import javax.vecmath.Tuple3d;
 import javax.vecmath.Vector3f;
 
 import sig.utils.DrawUtils;
+import sig.utils.OBJReader;
 
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener; 
 import java.awt.event.MouseMotionListener;
+import java.io.File;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.util.ArrayList;
@@ -57,21 +59,7 @@ public class SigRenderer implements KeyListener,MouseListener,MouseMotionListene
     }
 
     SigRenderer(JFrame f) {
-        cube = new Mesh(Arrays.asList(
-            new Triangle[]{
-                new Triangle(new Vector3f(),new Vector3f(0,1,0),new Vector3f(1,1,0)),
-                new Triangle(new Vector3f(),new Vector3f(1,1,0),new Vector3f(1,0,0)),
-                new Triangle(new Vector3f(1,0,0),new Vector3f(1,1,0),new Vector3f(1,1,1)),
-                new Triangle(new Vector3f(1,0,0),new Vector3f(1,1,1),new Vector3f(1,0,1)),
-                new Triangle(new Vector3f(1,0,1),new Vector3f(1,1,1),new Vector3f(0,1,1)),
-                new Triangle(new Vector3f(1,0,1),new Vector3f(0,1,1),new Vector3f(0,0,1)),
-                new Triangle(new Vector3f(0,0,1),new Vector3f(0,1,1),new Vector3f(0,1,0)),
-                new Triangle(new Vector3f(0,0,1),new Vector3f(0,1,0),new Vector3f(0,0,0)),
-                new Triangle(new Vector3f(0,1,0),new Vector3f(0,1,1),new Vector3f(1,1,1)),
-                new Triangle(new Vector3f(0,1,0),new Vector3f(1,1,1),new Vector3f(1,1,0)),
-                new Triangle(new Vector3f(1,0,1),new Vector3f(0,0,1),new Vector3f(0,0,0)),
-                new Triangle(new Vector3f(1,0,1),new Vector3f(0,0,0),new Vector3f(1,0,0)),
-            }));
+        cube = new Mesh(OBJReader.ReadOBJFile("teapot.obj"));
 
         Panel p = new Panel();
 

src/sig/Triangle.java

@@ -5,7 +5,7 @@ import java.awt.Color;
 public class Triangle {
     Vector3f A,B,C;
     Color col = Color.WHITE;
-    Triangle(Vector3f A,Vector3f B,Vector3f C) {
+    public Triangle(Vector3f A,Vector3f B,Vector3f C) {
         this.A=A;
         this.B=B;
         this.C=C;

src/sig/utils/FileUtils.java

@@ -0,0 +1,35 @@
+package sig.utils;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class FileUtils {
+    public static String[] readFromFile(String filename) {
+		File file = new File(filename);
+		//System.out.println(file.getAbsolutePath());
+		List<String> contents= new ArrayList<String>();
+		if (file.exists()) {
+			try(
+					FileReader fw = new FileReader(filename);
+				    BufferedReader bw = new BufferedReader(fw);)
+				{
+					String readline = bw.readLine();
+					do {
+						if (readline!=null) {
+							//System.out.println(readline);
+							contents.add(readline);
+							readline = bw.readLine();
+						}} while (readline!=null);
+					fw.close();
+					bw.close();
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+		}
+		return contents.toArray(new String[contents.size()]);
+	}
+}

src/sig/utils/OBJReader.java

@@ -0,0 +1,40 @@
+package sig.utils;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+import javax.vecmath.Vector3f;
+
+import sig.Triangle;
+
+public class OBJReader {
+    public static List<Triangle> ReadOBJFile(String f) {
+        String[] data = FileUtils.readFromFile(f);
+        List<float[]> vertices = new ArrayList<>();
+        List<Triangle> tris = new ArrayList<>();
+        for (String s : data) {
+            String[] split = s.split(Pattern.quote(" "));
+            if (split[0].equalsIgnoreCase("v")) {
+                vertices.add(new float[]{Float.parseFloat(split[1]),Float.parseFloat(split[2]),Float.parseFloat(split[3])});
+            } else
+            if (split[0].equalsIgnoreCase("f")) {
+                tris.add(new Triangle(
+                    new Vector3f(
+                        vertices.get(Integer.parseInt(split[1])-1)[0],
+                        vertices.get(Integer.parseInt(split[1])-1)[1],
+                        vertices.get(Integer.parseInt(split[1])-1)[2]),
+                    new Vector3f(
+                        vertices.get(Integer.parseInt(split[2])-1)[0],
+                        vertices.get(Integer.parseInt(split[2])-1)[1],
+                        vertices.get(Integer.parseInt(split[2])-1)[2]),
+                    new Vector3f(
+                        vertices.get(Integer.parseInt(split[3])-1)[0],
+                        vertices.get(Integer.parseInt(split[3])-1)[1],
+                        vertices.get(Integer.parseInt(split[3])-1)[2])));
+            }
+        }
+        return tris;
+    }
+}