Re: [Nel] How to use NLMISC::CPolygon::toConvexPolygons function

[lionel berenguier]

I don't know where is your problem, since It seems to work with your data.

 

This is my code::

 

 {
  CMatrix m1;
  
  CPolygon poly1;
  
  poly1.Vertices.push_back(CVector(0,8,0));
  poly1.Vertices.push_back(CVector(0,0,0));
  poly1.Vertices.push_back(CVector(12,0,0));
  poly1.Vertices.push_back(CVector(12,8,0));
  poly1.Vertices.push_back(CVector(8,8,0));
  poly1.Vertices.push_back(CVector(8,4,0));
  poly1.Vertices.push_back(CVector(4,4,0));
  poly1.Vertices.push_back(CVector(4,8,0));
  
  list<CPolygon> convexPolygons;
  
  nlinfo("%d", (uint)poly1.toConvexPolygons(convexPolygons,m1));

 

  nlinfo("");
  
  for(list<CPolygon>::iterator i = convexPolygons.begin() ; i != convexPolygons.end(); ++i)
  {
   vector<CVector> t1 = i->Vertices;
   
   for(int j = 0;j<t1.size();++j)
    nlinfo("%f,%f,%f", t1[j].x, t1[j].y, t1[j].z);
   nlinfo("");
  }
  
 }

 

And this is my result:

 

 

R:\code\test\test_3dyoyo\main.cpp(1551) : INF 1860: 1
R:\code\test\test_3dyoyo\main.cpp(1553) : INF 1860:
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 4.000000,4.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 4.000000,8.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 0.000000,8.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 0.000000,0.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1561) : INF 1860:
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 8.000000,4.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 4.000000,4.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 0.000000,0.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 12.000000,0.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1561) : INF 1860:
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 12.000000,0.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 12.000000,8.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 8.000000,8.000000,0.000000
R:\code\test\test_3dyoyo\main.cpp(1560) : INF 1860: 8.000000,4.000000,0.000000

which sounds good to me.

 

Lionel.

----- Original Message -----

From: Raman Gupta

To: Developer's list for the NeL platform

Sent: Saturday, December 13, 2003 6:06 AM

Subject: Re: [Nel] How to use NLMISC::CPolygon::toConvexPolygons function

Hi

 I have tried making last point != first point also but its not giving results.Input is --

0,8,0
0,0,0
12,0,0
12,8,0
8,8,0
8,4,0
4,4,0
4,8,0
Polygon is like --

_____          ________

|        |         |             |  (for input last point != first point)

|        |         |             |

|        |_____|             |

|                               |

|__________________|

 

 

Output is a list of 3 plygons--

4,4,0
4,8,0
0,8,0
0,0,0

 

12,8,0
8,8,0
8,4,0

 

12,0,0
12,8,0
8,4,0

The function -- Poly1.toConvexPolygons(convexPolygons,m1) is also returning  0(false).Please help.

 

Raman Gupta