Jump to content
  • Advertisement

Archived

This topic is now archived and is closed to further replies.

soreno

worldcraft .map file and 4. coordinate

This topic is 6003 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

The following data is from a worldcraft .map file. It describes a cube (16x16x16). How do i calculate the 4. coordinate so I can draw a polygon?
  
(  8,  8,  8 ) (  8, -8,  8 ) ( -8, -8,  8 ) //front

(  8, -8, -8 ) (  8,  8, -8 ) ( -8,  8, -8 ) //back

( -8, -8,  8 ) ( -8, -8, -8 ) ( -8,  8, -8 ) //left

(  8, -8, -8 ) (  8, -8,  8 ) (  8,  8,  8 ) //right

( -8,  8,  8 ) ( -8,  8, -8 ) (  8,  8, -8 ) //top

( -8, -8, -8 ) ( -8, -8,  8 ) (  8, -8,  8 ) //bund


glBegin(GL_POLYGON);
  //front

  glVertex3f( 8, 8, 8);
  glVertex3f( 8,-8, 8);
  glVertex3f(-8,-8, 8);
  glVertex3f(??,??,??);
glEnd();
  
Edited by - soreno on January 10, 2002 4:45:01 AM

Share this post


Link to post
Share on other sites
Advertisement
glBegin(GL_POLYGON);
//front
glVertex3f( 8, 8, 8);
glVertex3f( 8,-8, 8);
glVertex3f(-8,-8, 8);
glVertex3f(-8, 8, 8);
glEnd();

I''m not sure, but:

x y
+ +
+ -
- -
- + <-- isn''t it a logical idea

Share this post


Link to post
Share on other sites
yes, but what about the other faces..?

I got 3 vertices and need an algorihtm that calculates the 4.

Share this post


Link to post
Share on other sites
let me try


CVector v1,v2,v3,v4;

v1=CVector( 8.f, 8.f, 8.f);
v2=CVector( 8.f,-8.f, 8.f);
v3=CVector(-8.f,-8.f, 8.f);
v4=(v1+v3)*0.5f + ( (v1+v3)*0.5f - v2 );

/*
x4=(x1+x3)*0.5f + ( (x1+x3)*0.5f - x2 );
y4=(y1+y3)*0.5f + ( (y1+y3)*0.5f - y2 );
z4=(z1+z3)*0.5f + ( (z1+z3)*0.5f - z2 );
*/
this would be the way I''d do it. (hope there are no bugs)

Share this post


Link to post
Share on other sites
Could it be the following ?

Vertex A : xa, ya, za
Vertex B : xb, yb, zb
Vertex C : xc, yc, zc
Vertex D : xc+xb-xa, yc+yb-ya, zc+zb-za

so that AB = DC (vectors I mean).

Share this post


Link to post
Share on other sites
.map files dont store poly vertices, they store 3 points on a plane. Where the 3 plane cross, a vertice exists. Build your polys from those.

Share this post


Link to post
Share on other sites

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

Participate in the game development conversation and more when you create an account on GameDev.net!

Sign me up!