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[Mego]

Which is considered a valuable bit though? 0? 1?

You troll.

[Derekristow]

Which is considered a valuable bit though? 0? 1?

The 1s of course.  What would you need the 0s for, there's nothing in them.


Would any of you happen to have a grasp of quaternions?  They're giving me some funky issues, and I don't think I understand them well enough to figure it out.

Edit: Oh, for anyone who hasn't heard of them, quaternions are super awesome for 3D rotation.  This article and the XNA Quaternion class were all I needed to get started using them, and they've proven pretty easy to use once the actual math gets abstracted away a bit.

[Siquo]

Would any of you happen to have a grasp of quaternions?

I use them all the time, by waving my hands around and shouting "It's MAGIC!". (Unhelpful) Advice: Try to find the error by treating the built-in logic as magic boxes.

[Thief^]

When working with rotations, most funky issues are caused by the order you apply Yaw/Pitch/Roll/Scale/Translate.

[alway]

Which is considered a valuable bit though? 0? 1?

The 1s of course.  What would you need the 0s for, there's nothing in them.


Would any of you happen to have a grasp of quaternions?  They're giving me some funky issues, and I don't think I understand them well enough to figure it out.

Edit: Oh, for anyone who hasn't heard of them, quaternions are super awesome for 3D rotation.  This article and the XNA Quaternion class were all I needed to get started using them, and they've proven pretty easy to use once the actual math gets abstracted away a bit.

http://web.archive.org/web/20101103233941/http://www.genesis3d.com/~kdtop/Quaternions-UsingToRepresentRotation.htm
Unfortunately the site itself it gone as of a few weeks ago, but the wayback version should help.

[dreadmullet]

Quaternions are simply the best thing. And like Siquo said, you should think of them as magical. They remind me of 4x4 matrices, in that I use them a lot but have no idea how they work.

[Derekristow]

When working with rotations, most funky issues are caused by the order you apply Yaw/Pitch/Roll/Scale/Translate.

In this case, I'm actually converting the rotation of a "spherical camera" into a quaternion so that it works with some stuff I already had set up, then converting it back again.  The system works perfectly for everything else, but somewhere something is going awry and giving me some weird results.  Luckily, what I'm trying to do is relatively non-critical, and can be done in easier but less pretty ways.

tl;dr: I've tampered with forces beyond my control and can't figure out what's going wrong.

Edit:  On second thought, I'm going to strike the feature entirely, and do it differently instead.  Still would be nice to figure out what the issue is, but whatever.

[alway]

I tend to avoid spherical coordinates like the plague they are. Between their gimbal lock issues and the general PITA they are to work with combined with the relative ease of doing everything with quaternions, I typically don't see a need to use them.

[Derekristow]

They work out pretty well for a camera because it's physically impossible to turn the thing the wrong way.  Up will always be up, no matter what, which makes for very nice and relatively easy to program camera controls.

For anything else though, I'd agree.  They're very limited in what they can do.

[SolarShado]

Up will always be up, no matter what,

Unless you're in space

[da_nang]

TreeSets, the fuck do they work? (Java)
So I have problem, you see. (Or the program code that I was given has, grr...) Let's say you have a Region class. That class has a Set<Integerr> TreeSet storing the ID numbers of all the Buildings in that Region. And as is custom in OOP, this class has a getBuildings() that returns this TreeSet (Or specifically, a Set<Integer>).

Now I want to get these ID numbers out of that damn TreeSet so I can access the actual information about the Buildings using the supplied interface commands for accessing those buildings and then printing out a string containing the information of all the buildings in that Region.. So I read up on TreeSets to find out how to get the data out of it. Seems rather straightforward, just iterate through it and systematically append strings. Easy, right? Well, fuck no.
-code snip-
Now the DBInterface functions I dare not look at as they use things I haven't even heard of yet and seeing as how they were supplied to me I've assumed they're foolproof. You simply give it the id and it returns the Building through some magical way.

The problem here is that no matter what I do, it doesn't return that string, or if it does, there's no content in it. So either my head has become very thick or something is very wrong here.
EDIT: Turns out I was thick and had fucked up a for-block.

[alway]

There's codeblocks IDE http://www.codeblocks.org/
Visual C++ Express Edition (aka, the free one) http://www.microsoft.com/visualstudio/en-us/products/2010-editions/visual-cpp-express

Codeblocks is probably a good one to start out with, as visual studio has a bunch of options which for a beginner can end up being a PITA. It also depends on what you want to develop.

[MadocComadrin]

Go for Code::Blocks. My first dabblings in C++ were with that and I got that plus MinGW to compile a Hello World program right out of the box.

[Mego]

If you're going the way of the Code::Blocks (which you should), make sure you grab the version with MinGW.

[kaijyuu]

Eww, Code Blocks. +At least it's better than Visual Studio, I suppose.


I haven't found a c++ IDE I'd say is universally awesome. I use some wacky one last updated in 2005, and a friend of mine uses the Qt IDE even for projects that don't use Qt. Code Blocks is widely used and you can get a lot of support for it, so it'd probably the best, despite me not really liking the interface.