Converting local and region coordinates

Hi!

Is there a formula with which you can convert regional coordinates (of a sim) to local coordinates?

Them sims coordinates start in a corner of the sim while the coordinates of a child prim relative to the parent start in the parents center.

I want to make a map that has a dot moving over the map when the map moves around in a sim.

Now if the sim and the map both ahev the same ratio of length and width it should be possible to create a mathematical formula to convert the coordinates shouldn't it?

Is there anyone who knows how to do that?



Thanks,


Nicola

What about making the map's root prim be a small (and maybe invisible) prim at the corner of the map? Then the formula should be pretty simple, because your local position will be from the corner of the map, not the center, so all you need to do is scale it. So if it's a 1:100 map, just get the region coordinates and divide by 100, and that's your local coordinates.

Or something like that

found this in another thread.

http://secondlife.com/badgeo/wakka.php?wakka=GlobalCoordinate

I did something along these lines before. Here is a brief outline of what I did:

Map Object: 2.56m x 2.56m
Translation: (llGetPos() / 100) - <1.28, 1.18, 0.0>

Map Object: 5.12m x 5.12m
Translation: (llGetPos() / 50) - <2.56, 2.56, 0.0>

Both of these will then need a verticle Z compensation so that the target point will be "above" the map object. So just add <0.0, 0.0, .25> or whatever you feel is appropriate for your object.