Jump to content
  • Advertisement


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


Point in poly test

This topic is 6925 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


I'm trying to write a point in poly function for my lightmap creator.
Before I used a 2d point-in-poly test, but I want to use planes instead.
I tried this:


int CPoly::GetPointInPoly(CVector p)
CVector v1, v2, cNormal, tmp;
CPlane plane;

cNormal = GetNormal( NULL );

for(int i = 0; i < m_iNumVertices; i++)
v1 = m_pPolyVert->m_pVertices[ m_iVertices[i] ].cCoord;
tmp = cNormal.Crossproduct( v1 );
plane.m_cNormal = tmp;
plane.m_fDistance = - ( tmp.Dotproduct( p ) );
if( plane.m_fDistance < 0 )
if( plane.PlaneSide( p ) < 0)
return 0;
return 1;

But that doesn't work at all

Greets Tobias

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.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!