Determine which side is up..

Can anyone post some code that determines which side of a prim is up?

Thanks,
-cor-

on a six-sided square prim, face 0 is always the one located on the positive side of the z-axis, face 1 is on the negative side. I don't remember the other four, but a basic texture script with a while-loop and some numbered textures should clear that up.
Determining which side is up on a six-sided prim is not so difficult, just find out which value of which axis ends up highest on global z.

Conversion from local to global axis is local position * root rotation

a good representative for face 0 would be <0,0,1>, face 1 would be <0,0,-1>

Yes, side 0, and side 5 (assuming a 6 sided prim) are easily determined, however sides 1 through 4 vary their rotations up and down as the prim is rotated so it's not as easy. So it could be characterised as follows:

0 = (0, 0, n) if x and y are about 0 then this is side zero.. n is irrelevant
5 = (+/- 3.14, 0 n) abs(x) seems to always be about 3.14, y is always about 0, n again is irrelevant

1-4 = (any varying number of values shared among x, y, and z)

The 1 - 4 part is what is giving me an aneurysm.
-cor-

While the first two responses here are correct... I have a feeling you're asking for how to find the top of a six-sided die or the like, which is a different problem entirely.

While there are a couple of ways to do this, by far the easiest I know is to code a randomizer in the die itself, then have it turn whichever side you want to face "up." To do this, I would suggest reading the following articles:

http://secondlife.com/badgeo/wakka.php?wakka=llRotLookAt
http://secondlife.com/badgeo/wakka.php?wakka=llFrand

I also have example code that will do this, if you ask me in-world.

Well I finally got it working.. there is a correlation between 2 of the 3 coordinates either x=y or x=z or x=-y or x=-z, etc etc etc.

The trick is that sometimes with a dice in SL it could land at an arbitrary angle throwing off the test alittle (yes i'm using a little deviation and not just if (x==y) The way i fixed this was to add more downward force (gravity/weight) to the dice so that they have to land flat.

Looking to make a yahtzee game sometime in the future

-cor-

There was a really good thread on this about a month ago (or was it two or three?) anyway try a forum search.

Can I read any of thise to mean that the sides of a prim aren't always numbered the same way?

Like that loop that was mentioned... that would number the sides the same way every time, right? And what about cuts & hollows? It seems like I found some inconsistency with this previously.

A link to that old thread would be great if anyone knows where it is.