Comments on: 29. OpenGL Bounding Sphere Collision

By: Swiftless

Swiftless — Mon, 06 Jun 2011 06:05:33 +0000

Hi Josh,

I’ve had a couple of reports of this since the new theme has kicked in, I’ll be either removing the ads on the pages messing up, or making them WordPress friendly shortly.

Sorry for any inconvenience.
Swiftless

By: Josh

Josh — Mon, 06 Jun 2011 01:49:03 +0000

It’s almost impossible to read this code when the ad next to the line numbers makes it only 3 characters per line..

By: Swiftless

Swiftless — Thu, 03 Mar 2011 05:37:09 +0000

Hi Dorekofu_87,

If I get a chance, I will see what I can do

Cheers,
Swiftless

By: dorekofu_87

dorekofu_87 — Sat, 26 Feb 2011 23:20:13 +0000

Can you make a tutorial on AABB collision detection ?

By: Swiftless

Swiftless — Sun, 09 Jan 2011 13:33:00 +0000

Hey Hotcoffee Bennett,

When you say approximate, what do you mean exactly?

If you want to find a sphere that covers an entire cube, the radius of the sphere should be the distance between the centre of the cube and one of the edges.

Cheers,
Swiftless

By: Hotcoffee Bennett

Hotcoffee Bennett — Wed, 05 Jan 2011 06:05:39 +0000

how do wuould i approximate say asphere to a cube correctly?

By: Hotcoffee Bennett

Hotcoffee Bennett — Wed, 05 Jan 2011 01:09:08 +0000

distance between two points…simple but powerful!!!!

By: Concerned_reader

Concerned_reader — Mon, 13 Sep 2010 00:13:18 +0000

Pictures would make this even better

By: E2A

E2A — Mon, 26 Apr 2010 22:23:01 +0000

Hi Philip, I hope I understood you good, but what you want to know, is how to know where you are looking at some point of the rendering? are you using glLookAt ? if yes, then from the 4th to the 6th value are the LookAt X,Y,Z respectively, if not, then you are using glRotatef -> in this case I don’t really know how to apply, I guess doing some Sin/Cos will be enough, they way to “shoot” in straight line, can be done by using some geometry -> something like Ray Tracing, the definition of a Ray is; r(t) = o + td, where “o” is the origin (your actual position) and t is the direction you are looking at, “d” is the direction vector (where you are looking at), and t is the scalar, t means how many times is multiplied the direction, for example your origin is 0,0,0 and d is 1,0,0, that means that you are looking at the x axis and the ray distance at x is 1, but if t is 2, then you are looking at x=2, if t<0 that means the point is behind the ray, "d" should be normalized, so "t" we can say is a distance unit, which shows how far is the point from the origin
The easiest collision detection is doing ray-sphere and ray-triangle , I think ray-plane is easy too, but I have code it yet (in my life)

@Donald: sorry man, I have some troubles with my thesis, and I will need more time, before we can start the video-youtube-thing, I hope all is fine hehe!

By: Philip Moore

Philip Moore — Thu, 22 Apr 2010 14:29:18 +0000

Hi Donald

How do you determine which direction is away from the camera or which way it is looking