Monday, February 25, 2008

3d Cube Space

Here's my second Papervision3d routine.

This is actually the first time since school that I used linked lists. wow.
My first attempt had a garbage collection problem, in that it didn't garbage collect, so the memory usage just kept growing, eventhough Flashplayer should've kept it in check. Gotta dive deeper into that, cuz this stuff is fun :)

I've solved it by recycling the objects in my list, works fine and is probably not as memory-fragmenting as the 'correct way'...

It's probably been done before, you know, snake, but now in 3d- whee... But it has not yet been done by me, unil now. :P

Click to view

Oh yeah, I've made this using FlashDevelop, and I like it, so I'm gonna use it more in the future :)

Let me know what you think

Thursday, February 21, 2008

Papervision test

For some reason I'm really crap at finding documentation about stuff online.

So it took me a while to download Papervision3d, and get started, but as soon as I got the sources installed I was ready to go to mess around a bit, and finally make this little test.

Simple papervision scene navigation

You can navigate around the scene using the cursor keys, press shift and left-right for strafing, and if you press space you go up :)

Unfortunately, after I made this, I found out that the source I downloaded from the papervision site was the OLD version of papervision. V1.5 or something, while 2alpha was already out. But for some reason, not available on the papervision site itself.

Or.. i was just looking in the wrong spot?

Anyway, I had to download the new version from Ralph's blog

Haven't been able to mess with it yet though, hopefully soon :)

I've setup FlashDevelop at home now, which looks promising, but haven't gotten round to using it yet.

Thursday, February 7, 2008

int bug

I found a little bug in actionscript 2, which apparantly has been fixed in actionscript 3 but which I found funny enough to show you guys.

Trying to fix a bug in an older source, where I took part of a symbolname "Button037", and cut out the 035 part as a substring, which I then used to flip to some page in a pageflipper component.
After the pageflipper bugged out (trying to add 5 to "037" which ended up with "0375" instead of 37 ..duh, I know) I put an int() around the value I got from the symbol name.
(Never having looked at the manual entry for int() but beeing used to its function from ASP/vbscript, I didn't know it was deprecated and I should use Math.floor() instead ...lesson learned :)


Whats the bug you ask?
Well.. If you use int() to convert a string to a number, it doesn't always work correctly in actionscript 2.0 if you have leading zero's.

trace(int("037")); returns 31 for example
I plotted the values out in a graph to see if there was some kind of pattern to it, and there was. Click here to see it

Sourcecode for that is:

for (intT=0; intT<400; intT++)
trace(intT + " : " + int("0" + intT));
_root.lineTo(intT, int("0" + intT));

Anyway.. it's fixed in actionscript 3, and you shouldn't use int() anyway, but hey, it might come in handy to know this if you're still using int() in your code, and it doesnt work the way it should :)

Edit : My Collegue Hugo asked if Number() had the same bug. Apparantly it does, BUT. its not what I thought it was.

When you use Number() to convert a string to a number, you can use a leading zero to indicate you're using an OCTAL value just like 0x denotes a hexadecimal value.

So the bug actually isn't that int() works incorrectly, but that the manual doesn't say that you can use a leading 0 to indicate an octal value.
So why does it seem to be 'fixed' in as3.0? Well, you can use octal notation in as2.0, but this doesnt work anymore in as3.0.

Not sure why anyone would want to use octal notation, but to prove this, try this little example in as3.0 and as2.0

for (var intT=00; intT< 020; intT++)

as2.0 will count to 15
as3.0 will count to 19

Saturday, February 2, 2008

Water ripple source

Here's the sourcecode for the water ripple effect.
Let me know what you think.

Download source

Have fun!