diff UI code/3DboxGL.mm @ 0:a223551fdc1f

First commit - copy from tweakathlon.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UI code/3DboxGL.mm	Fri Oct 10 11:46:42 2014 +0100
@@ -0,0 +1,157 @@
+//
+//  3DboxGL.cpp
+//  tweakathlon
+//
+//  Created by Robert Tubb on 17/04/2014.
+//
+//
+
+#include "3DboxGL.h"
+
+
+Leap3DBoxGL::Leap3DBoxGL(float ax,
+                         float ay,
+                         float awidth,
+                         float aheight,
+                         float azx,
+                         float azy,
+                         const UIProps& props) :
+Leap3DBox(ax,ay,awidth, aheight, azx, azy, props)
+{
+    indicatorColor = ofColor(123, 123, 220);
+    // how much to rotate the box
+    angleX = -25;
+    angleY = -24;
+    
+    depth = width; // its a cube
+    
+    // where is the camera
+    camTrans = 0;
+    
+    // cube is centred on 0,0,0
+    float I = width/2;
+    float O = -width/2;
+    
+    // left face x=O
+    // back face z=O
+    // top face y=O
+    
+    // positions of vertices
+    ofPoint ltf = ofPoint( O,O,I );
+    ofPoint lbf = ofPoint( O,I,I );
+    ofPoint rtf = ofPoint( I,O,I );
+    ofPoint rbf = ofPoint( I,I,I );
+    
+    ofPoint ltr = ofPoint( O,O,O );
+    ofPoint lbr = ofPoint( O,I,O );
+    ofPoint rtr = ofPoint( I,O,O );
+    ofPoint rbr = ofPoint( I,I,O );
+    
+    // now build faces
+    // rear
+    boxMesh.addVertex(ltr);
+    boxMesh.addVertex(rtr);
+    boxMesh.addVertex(rbr);
+    
+    boxMesh.addVertex(ltr);
+    boxMesh.addVertex(rbr);
+    boxMesh.addVertex(lbr);
+    
+    // left
+    boxMesh.addVertex(ltf);
+    boxMesh.addVertex(ltr);
+    boxMesh.addVertex(lbr);
+    
+    boxMesh.addVertex(ltf);
+    boxMesh.addVertex(lbr);
+    boxMesh.addVertex(lbf);
+    
+    // bottom
+    boxMesh.addVertex(lbf);
+    boxMesh.addVertex(lbr);
+    boxMesh.addVertex(rbr);
+    
+    boxMesh.addVertex(lbf);
+    boxMesh.addVertex(rbr);
+    boxMesh.addVertex(rbf);
+    
+    // top
+//    boxMesh.addVertex(ltr);
+//    boxMesh.addVertex(rtr);
+//    boxMesh.addVertex(rtf);
+//    
+//    boxMesh.addVertex(ltr);
+//    boxMesh.addVertex(rtf);
+//    boxMesh.addVertex(ltf);
+//    
+//    // right
+//    boxMesh.addVertex(rtf);
+//    boxMesh.addVertex(rtr);
+//    boxMesh.addVertex(rbr);
+//    
+//    boxMesh.addVertex(rtf);
+//    boxMesh.addVertex(rbr);
+//    boxMesh.addVertex(rbf);
+    
+    // front
+//    boxMesh.addVertex(ltr);
+//    boxMesh.addVertex(rtr);
+//    boxMesh.addVertex(rbr);
+//    
+//    boxMesh.addVertex(ltr);
+//    boxMesh.addVertex(rbr);
+//    boxMesh.addVertex(lbr);
+    
+    boxMesh.setupIndicesAuto();
+}
+
+
+//--------------------------------------------------------------
+
+void setNormals( ofMesh &mesh )
+
+{
+    //The number of the vertices
+    int nV = mesh.getNumVertices();
+    
+    //The number of the triangles
+    int nT = mesh.getNumIndices() / 3;
+    
+    vector<ofPoint> norm( nV );
+    
+    //Array for the normals
+    //Scan all the triangles. For each triangle add its
+    //normal to norm's vectors of triangle's vertices
+    
+    for (int t=0; t<nT; t++) {
+        //Get indices of the triangle t
+        int i1 = mesh.getIndex( 3 * t );
+        int i2 = mesh.getIndex( 3 * t + 1 );
+        int i3 = mesh.getIndex( 3 * t + 2 );
+        
+        //Get vertices of the triangle
+        const ofPoint &v1 = mesh.getVertex( i1 );
+        const ofPoint &v2 = mesh.getVertex( i2 );
+        const ofPoint &v3 = mesh.getVertex( i3 );
+        
+        //Compute the triangle's normal
+        ofPoint dir = ( (v2 - v1).crossed( v3 - v1 ) ).normalized();
+        
+        //Accumulate it to norm array for i1, i2, i3
+        norm[ i1 ] += dir;
+        norm[ i2 ] += dir;
+        norm[ i3 ] += dir;
+    }
+    //Normalize the normal's length
+    for (int i=0; i<nV; i++)
+    {
+        norm[i].normalize();
+        
+    }
+    //Set the normals to mesh
+    mesh.clearNormals();
+    mesh.addNormals( norm );
+}
+
+// algs
+