🎉 Celebrating 25 Years of GameDev.net! 🎉

Not many can claim 25 years on the Internet! Join us in celebrating this milestone. Learn more about our history, and thank you for being a part of our community!

Back to NeHe Productions

Vectors, Planes & Intersections

NeHe Productions Affiliates

Started by alistair b August 03, 2000 05:23 AM

2 comments, last by alistair b 23 years, 11 months ago

alistair b

122

Author

August 03, 2000 05:23 AM

What''s the simplest way to figure out if two vectors intersect in front of a (variable) plane. i guess i could use the intersection point and see if its a positive or negative multiple of the normal to the plane? if this isn''t right, thanks in advance for better solutions alistair

smidge_tech

122

August 03, 2000 06:02 AM

Yep, that''s just right.

Can be optimized, but no one ever bothers...

========
Smidge
www.smidge-tech.co.uk
========

--Mr Smidge

tcs

122

August 03, 2000 02:22 PM

Try to look at the public available source code for the Graphic Gem books. They have some very fast code for 2 line intersection and lots of other intersection tests. maybe they have exactly what you want...

Tim

--------------------------
www.gamedev.net/hosted/glvelocity
glvelocity.gamedev.net
www.glvelocity.com

Tim--------------------------glvelocity.gamedev.netwww.gamedev.net/hosted/glvelocity

alistair b

122

Author

August 03, 2000 03:57 PM

ok, i did what i said and it worked (maybe should have tried it first!)
i found http://nate.scuzzy.net/normals/normals.html really helpful, and managed to rearrange the algebra to get a really easy expression.

Thanks for the help anyway,

alistair