opening a hinged box lid?

I've been looking through the forums, but can't find how to do a box opening its lid...

I've seen a few door examples, and thinking the top of the box might could recycle a door script just swinging on a different axis. Can anyone spare a newbie a tip?

Thanks in advance!

If you make the lid prim the same as you have to do doors, then you can make is function basically the same.

try this thread

thank you so much both!

Option 1:
If you use a flat lid (like a door), you can use a normal door script.
To make all doorscripts function correctly the lid/door needs to be cut in half, so the axis of the prim seems to be on the 'side'. (E.g. use a cut of 0.375/0.625)

Make sure you use one which still functions correctly after linking. A lot of door scripts tend to not take the root prim rotation into account of a linked set.

Option 2:
If you want to use a different shape as a lid (e.g. half a cylinder etc.)
what you need is a rotation over a different axis than the normal central axis. You can do this easiest by combining a move and rotation using llSetPrimitiveParams . Information about how to do a rotation over an arbitrary axis can be found in the lsl wiki (rotations)

Remember that llSetPrimitiveParams uses global coordinates, where llSetLocalRot,llSetPos uses local coords based on the root prim. It's possible to use llSetLocalRot/llSetPos too (no need to recalculate from local coords to globals), but the rotation will be less smooth.

You can also use option2 to create a lid made of multiple prims. You need a slave script in each prim, which does the actual rotation, and a master script, which sends linked messages to the slaves, containing the center of rotation.


The suggested way of using delink/link makes the rotation/offset calculations a lot easier, but requires a LOT of 'maintenance' code. (To make sure everything goes well when moving/deleting/taking the object(s))

Thank you Damanios! At this point in scripting, some of it sounds really greek. I'll definitely look through and study what you said. Maybe one day, it will come second nature. Thank you so much for your help.

Not all doorscripts require the half-cut. I have made a script for an uncut door which rotates as a child in a linkset. And it works well for a box lid, too. The process just requires a bit more math and tweaking, but especially for a box lid, you may not want to use the normal "door cut".

Baron Hauptmann

There is an example of a box with hinged lid that works at any angle. Free to take at: Naiad 161,199,22

Look in the yard near the house for a brown box with an informative floating text line above it.

Cheers,

wwv

If it is small, phantom or an attachment, you can just use the trick of having one lid prim in the "open" position, one in the "closed" and using llSetLinkAlpha (or other method) to make the unwanted lid invisible. Obviously in the case of a large object that is not phantom, people will bump into the invisible lid, which is not ideal.