Back to General and Gameplay Programming

weird structure problem

General and Gameplay Programming Programming

Started by daniel_i_l April 03, 2006 05:04 PM

2 comments, last by daniel_i_l 18 years ago

daniel_i_l

295

Author

April 03, 2006 05:04 PM

I'm writing a structure that hold a box (SBox), it is made up of a vector of planes (SPlane) and each plane is made out of a vector of corners(v_Corners) were each corner has x,y and z values. I wanted to make a constructer that initiates all the verticies (planes,corners,verticies) by a center point (x,y,z) a width (w), height (h), and a depth (d). I did this:


struct SPlane{
 vector<CVector3> v_Corners;
 int ID;
};

struct SBox{
 vector<SPlane> v_Sides;
 int ID;
 SBox(vector<SPlane> s, int i){v_Sides = s; ID = i;}
 SBox(float x, float y, float z, float w, float d, float h, int i);
 //for debugging only
 void DrawBox();
};

SBox :: SBox(float x, float y, float z, float w, float d, float h, int i)
{
  SPlane temp_plane;
  CVector3 temp_corner;
  
  ID = i;
  
  //front side
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
  
  //right side
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
  
  //back side
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
  
  //left side
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
  
  //top side
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y + h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
  
  //bottom side
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z + d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x + w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  
  temp_corner.x = x - w;  temp_corner.y = y - h; temp_corner.z = z - d;
  temp_plane.v_Corners.push_back(temp_corner);
  v_Sides.push_back(temp_plane);
}

But for some reason all of the 6 sides got the same corners and vertices as the front side? Why would this be? Thanks.

"We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the internet, we know this is not true." -- Professor Robert Silensky

Zakwayda

2,389

April 03, 2006 05:14 PM

Quote:Original post by daniel_i_l
But for some reason all of the 6 sides got the same corners and vertices as the front side? Why would this be?
Thanks.

You need to call 'temp_plane.v_Corners.clear()' before adding each side.

Also, std::vector<> is most appropriate for arrays whose size is not known at compile time, or that may need to be resized at some point. Otherwise, just use a standard fixed-size C++ array (or perhaps boost::array).

extralongpants

704

April 03, 2006 05:16 PM

You are never clearing the vector of corners in your temporary plane [smile]. Thus, you have one plane with 16 or so points, which means that all of your sides are using the same first 4 points of the plane. After each call to:

v_Sides.push_back(temp_plane);

add

temp_plane.v_Corners.clear();

That should fix the problem.

[EDIT] - Darn you jyk! You beat me to it! [crying]

daniel_i_l

295

Author

April 03, 2006 05:17 PM

Thanks, now it works.

weird structure problem

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

weird structure problem

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines