Detect face direction of clicked edge.

src/sig/Cube.java

@@ -9,16 +9,22 @@ public class Cube extends Mesh{
         this.triangles=OBJReader.ReadOBJFile("cube.obj",true);
         triangles.get(0).tex=type.getTexture(BlockType.FRONT);
         triangles.get(1).tex=type.getTexture(BlockType.FRONT);
+        triangles.get(0).dir=triangles.get(1).dir=BlockType.FRONT;
         triangles.get(2).tex=type.getTexture(BlockType.RIGHT);
         triangles.get(3).tex=type.getTexture(BlockType.RIGHT);
+        triangles.get(2).dir=triangles.get(3).dir=BlockType.RIGHT;
         triangles.get(4).tex=type.getTexture(BlockType.BACK);
         triangles.get(5).tex=type.getTexture(BlockType.BACK);
+        triangles.get(4).dir=triangles.get(5).dir=BlockType.BACK;
         triangles.get(6).tex=type.getTexture(BlockType.LEFT);
         triangles.get(7).tex=type.getTexture(BlockType.LEFT);
+        triangles.get(6).dir=triangles.get(7).dir=BlockType.LEFT;
         triangles.get(8).tex=type.getTexture(BlockType.TOP);
         triangles.get(9).tex=type.getTexture(BlockType.TOP);
+        triangles.get(8).dir=triangles.get(9).dir=BlockType.TOP;
         triangles.get(10).tex=type.getTexture(BlockType.BOTTOM);
         triangles.get(11).tex=type.getTexture(BlockType.BOTTOM);
+        triangles.get(10).dir=triangles.get(11).dir=BlockType.BOTTOM;
     }
     
 }

src/sig/MouseHandler.java

@@ -4,9 +4,9 @@ import java.awt.event.MouseEvent;
 
 public class MouseHandler {
     public MouseEvent e;
-    public Block b;
-    public MouseHandler(MouseEvent e,Block b) {
+    public Triangle t;
+    public MouseHandler(MouseEvent e,Triangle t) {
         this.e=e;
-        this.b=b;
+        this.t=t;
     }
 }

src/sig/Panel.java

@@ -396,6 +396,7 @@ public class Panel extends JPanel implements Runnable {
             triTransformed.tex = t.tex;
             triTransformed.b=t.b;
             triTransformed.unmodifiedTri=t;
+            triTransformed.dir=t.dir;
 
             Vector normal=new Vector(),line1=new Vector(),line2=new Vector();
             line1 = Vector.subtract(triTransformed.B,triTransformed.A);
@@ -458,6 +459,7 @@ public class Panel extends JPanel implements Runnable {
                     triProjected.V = (Vector2)clipped[i].V.clone();
                     triProjected.b=clipped[i].b;
                     triProjected.unmodifiedTri=clipped[i].unmodifiedTri;
+                    triProjected.dir=clipped[i].dir;
 
                     triProjected.T.u = triProjected.T.u/triProjected.A.w;
                     triProjected.U.u = triProjected.U.u/triProjected.B.w;

src/sig/SigRenderer.java

@@ -94,10 +94,29 @@ public class SigRenderer implements KeyListener,MouseListener,MouseMotionListene
         }
         if (answer!=null) {
             if (answer.e.getButton()==MouseEvent.BUTTON1) {
-                addBlock(Vector.add(answer.b.pos,new Vector(0,1,0)),BlockType.PLANKS);
+                switch (answer.t.dir) {
+                    case BlockType.FRONT:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(0,0,-1)),BlockType.PLANKS);
+                    }break;
+                    case BlockType.BACK:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(0,0,1)),BlockType.PLANKS);
+                    }break;
+                    case BlockType.LEFT:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(-1,0,0)),BlockType.PLANKS);
+                    }break;
+                    case BlockType.RIGHT:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(1,0,0)),BlockType.PLANKS);
+                    }break;
+                    case BlockType.TOP:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(0,1,0)),BlockType.PLANKS);
+                    }break;
+                    case BlockType.BOTTOM:{
+                        addBlock(Vector.add(answer.t.b.pos,new Vector(0,-1,0)),BlockType.PLANKS);
+                    }break;
+                }
             } else 
             if (answer.e.getButton()==MouseEvent.BUTTON3) {
-                removeBlock(answer.b.pos);
+                removeBlock(answer.t.b.pos);
             }
             answer=null;
         }

src/sig/Triangle.java

@@ -10,6 +10,7 @@ public class Triangle {
     public long nextRenderTime = -1l;
     public long nextRenderTime2 = -1l;
     public Triangle unmodifiedTri;
+    public int dir = -1;
     public Triangle() {
         this(new Vector(),new Vector(),new Vector());
     }
@@ -32,6 +33,7 @@ public class Triangle {
         targetTriangle.tex=this.tex;
         targetTriangle.b=this.b;
         targetTriangle.unmodifiedTri=this.unmodifiedTri;
+        targetTriangle.dir=this.dir;
     }
     @Override
     protected Object clone(){
@@ -40,12 +42,12 @@ public class Triangle {
         t.tex=tex;
         t.b=b;
         t.unmodifiedTri=unmodifiedTri;
+        t.dir=dir;
         return t;
     }
     @Override
     public String toString() {
-        return "Triangle [A=" + A + ", B=" + B + ", C=" + C + ", T=" + T + ", U=" + U + ", V=" + V + ", col=" + col
-                + "]";
+        return "Triangle [A=" + A + ", B=" + B + ", C=" + C + ", T=" + T + ", U=" + U + ", V=" + V + ", col=" + col + ", dir=" + dir + "]";
     }
     public int getColor() {
         return col;
@@ -106,6 +108,7 @@ public class Triangle {
             out_tri[0].tex = in.tex;
             out_tri[0].b=in.b;
             out_tri[0].unmodifiedTri=in.unmodifiedTri;
+            out_tri[0].dir=in.dir;
             out_tri[0].A = inside_points[0];
             out_tri[0].T = inside_tex[0];
             out_tri[0].B = Vector.IntersectPlane(plane_p, plane_n, inside_points[0], outside_points[0],t);
@@ -123,6 +126,7 @@ public class Triangle {
             out_tri[0].col=out_tri[1].col=in.col;
             out_tri[0].tex=out_tri[1].tex=in.tex;
             out_tri[0].b=out_tri[1].b=in.b;
+            out_tri[0].dir=out_tri[1].dir=in.dir;
             out_tri[0].unmodifiedTri=out_tri[1].unmodifiedTri=in.unmodifiedTri;
             out_tri[0].A = inside_points[0];
             out_tri[0].B = inside_points[1];

src/sig/utils/DrawUtils.java

@@ -96,7 +96,7 @@ public class DrawUtils {
                         if (tex_w>SigRenderer.depthBuffer_noTransparency[i*SigRenderer.SCREEN_WIDTH+j]) {
                             SigRenderer.depthBuffer_noTransparency[i*SigRenderer.SCREEN_WIDTH+j]=tex_w;
                             if (j==SigRenderer.temp_request.getX()&&i==SigRenderer.temp_request.getY()) {
-                                SigRenderer.tempAnswer=new MouseHandler(SigRenderer.temp_request,ref.b);
+                                SigRenderer.tempAnswer=new MouseHandler(SigRenderer.temp_request,ref);
                             }
                         }
                     }
@@ -172,7 +172,7 @@ public class DrawUtils {
                         if (tex_w>SigRenderer.depthBuffer_noTransparency[i*SigRenderer.SCREEN_WIDTH+j]) {
                             SigRenderer.depthBuffer_noTransparency[i*SigRenderer.SCREEN_WIDTH+j]=tex_w;
                             if (j==SigRenderer.temp_request.getX()&&i==SigRenderer.temp_request.getY()) {
-                                SigRenderer.tempAnswer=new MouseHandler(SigRenderer.temp_request,ref.b);
+                                SigRenderer.tempAnswer=new MouseHandler(SigRenderer.temp_request,ref);
                             }
                         }
                     }