Jump to content
  • Advertisement

Archived

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

chris82

could someone check my function?

This topic is 6637 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

vertf* normal(vertex* st1,vertex* st2,vertex* st3) { float len; numb1.x=(float)atof(&(st1->vx[0]));numb1.y=(float)atof(&(st1->vy[0]));numb1.z=(float)atof(&(st1->vz[0])); numb2.x=(float)atof(&(st2->vx[0]));numb2.y=(float)atof(&(st2->vy[0]));numb2.z=(float)atof(&(st2->vz[0])); numb3.x=(float)atof(&(st3->vx[0]));numb3.y=(float)atof(&(st3->vy[0]));numb3.z=(float)atof(&(st3->vz[0])); v1.x=numb1.x - numb2.x; v1.y=numb1.y - numb2.y; v1.z=numb1.z - numb2.z; v2.x=numb3.x - numb2.x; v2.y=numb3.y - numb2.y; v2.z=numb3.z - numb2.z; //cross product norm.x=(v1.y*v2.z)-(v2.y*v1.z); norm.y=(v1.z*v2.x)-(v2.z*v1.x); norm.z=(v1.x*v2.y)-(v2.x*v1.y); //normalizziamo!!!!!!!!!!! len=(float)sqrt(potenzaf(norm.x,2)+potenzaf(norm.y,2)+potenzaf(norm.z,2)); if (len==0.0f)len=1.0f; norm.x/=len; norm.y/=len; norm.z/=len; return (&norm); } this function is passed 3 struct : struct vertex { char vx[15],vy[15],vz[15];} and then result a pointer to: struct vertf { float x,y,z;}numb1,numb2,numb3,v1,v2,norm; but it seem don''t works properly because when i try to display the result some polygon are invisible ,so i think the normal aren''t calculated well!

Share this post


Link to post
Share on other sites
Advertisement
Guest Anonymous Poster
I don''t see anything wrong with your code, maybe you''re defining some of your polygons differently (ie. some have the vertexes defined in a clockwise order and others in a counter-clockwise order)?

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!