How to sort 3D vertices of a polygon in order?

we are given multiple random coplanar 3D points. Compute normal by any 3 Point. we need to rotate all these point in X-Y plane. So compute rotation matrix normal to (0,0,1). rotate all these in X-Y plane.

      double[] normal = PlaneUtils.getNormal(tverts);

      Vector3 srcNormal = new Vector3(normal[0], normal[1], normal[2]).normalize();

      Vector3 destNormal = new Vector3(0, 0, 1);

      // Rotation Matrix of Arbitrary Polygon From Current Plane to XY Plane

      Matrix4 rotationMatrix = Matrix4.rotate(destNormal, srcNormal);

      for (int i = 0; i < PointArrVal.length; i++) {

        PointArrVal[i].timesEquals(rotationMatrix);

      }

Now Compute Mean of All X-coordinate and mean of All Y-coordinate.

Mean of X= Sum of All X-coordinate/number of Point and in same way compute mean of Y.

Compute Atan2 angle between Mean Point and given coordinate.

Math.atan2(clipCornerPoint[i].y - cY, clipCornerPoint[i].x - cX), clipCornerPoint[i]

Store computed angle with vertices in Ordered Multi Map like

TreeMap <Double, List<Point3>> multimap = new TreeMap<Double, List<Point3>>();
      for (int i = 0; i < clipCornerPoint.length; i++) {
        putObjects(multimap, Math.atan2(clipCornerPoint[i].y - cY, clipCornerPoint[i].x - cX), clipCornerPoint[i]);
      }

Sort map angle as key and it will give you vertices in order.

now reverse your point in same previous Arbitrary Axis by inverse Rotation Matrix.

A habit of donation “We only have what we give.”

I started my earning(income) journey from Reliance Jio as Software Developer in 10 July 2012 on my b'day. I was happy to join company.because it is very big industry. there was one dream from College time that when  I will earn I will donate some part of my salary every month. I got my first salary in august around 22K. all of my friends and me were happy with first salary and planning to go outside for celebration and I forgot my small dream.One Sunday i was enjoying tea with my friend and i saw a beggar in Mumbai i thought for a moment and my donation dream strike in my mind. but as human nature I started giving excuse to myself  "first make yourself at some level to give donation". why should i give my hard earning money ? Beggar can also earn he also have hand blah.... But I learned one thing that It was very difficult to donate 10rs from your hard earned salary. But in the evening  I opened a Recurring deposit in my salary Account and started to save 2% of my monthly salary that was around 600rs and thus i made yearly saving of 7200rs. I donated this 7200rs  for treatment  of one old cow in my village. Then i got increment next year my salary became 40K so 2% of that was 9600 rs yearly. I bought some sport material and exercising equipments for the sport club of my village. In 3rd year 2% of my salary was 12000rs. I donated to my village Gausala. Then I switched my Job from Reliance to VizExperts Gurgaon. Now 2% of my annual income is Rs 16800. now I am thinking of donating it to a cancer patient in my village. I feel always very happy about this initiative taken by me. it is only 2% of my salary but a good amount to help someone.

“There is nothing more beautiful than someone who goes out of their way to make life beautiful for others.” 

IIT JEE Main 2014 answer key Paper Code wise

JEE Main 2014 Was Successfully Conducted on 6th April 2014 (Offline Mode) at 150 Examination Centers all over the Country. A large No. of Candidates have Been Appeared in the Exam in Paper 1 as Well as in Paper 2. The First Paper of JEE Main was Conducted From 09:30 Am to 12:30 Am whereas Second Paper or Paper II Was Conducted From 02:00 Pm to 05:00 Pm. The Online Entrance Test of JEE Main will be Conducted on 9th|11th|12th & 19th April 2014. A lot of Candidates have Been Appeared in the Offline Exam on 6th April 2014 whereas Remaining Candidates will appear in the Online Exam of JEE Main 2014.

Candidates can Check the Answer Key Set Wise as as Set E, Set F, Set G, Set H form the Link Mentioned Below on this Page. The Answer Key of JEE Main 2014 will give you a Rough Idea to the Candidates about their Marks in the JEE Main Exam 2014. 

Coaching Institute	JEE Main 2014 Answer Key
Motion IIT-JEE	CODE H