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Hello there,

I'm looking for a way to detect whether a user's cursor is hovering on an object (say a cube) in the 3D space

illust: (o = cursor)
__________________________________________________________________
| Cursor outside the cube ===== | Cursor inside the cube ========|
--------------------------------|--------------------------------|
=========_________==============|=========_________==============|
==o=====|=========|=<-=the=cube=|========|=========|=============|
========|=========|=============|========|===o=====|=============|
========|=========|=============|========|=========|=============|
========|_________|====false====|========|_________|====true=====|
================================|================================|
--------------------------------|--------------------------------|

and later maybe once the problem above is solved, I need to store the selected object ID when the user left-clicked it (dbMouseClick() = 1)


I don't have any idea about this.
Could anyone help me out?

Some example lines of code would be great



Thanks.

dbPickObject() ?

Sorry,
The illustration looks messed up.

Here I attached the illust. image.

What I'm talking about is,
something like when you're selecting a unit in an RTS game, or maybe a monster in an RPG game.

How to determine whether the mouse cursor is hovering the unit or not? And if we do a mouse left-click, how do we get the selected object's ID?

jezza gave you the answer. No clicking necessary, as soon as the mouse is over the object it will return the ID.

dbPickObject
This command will return the Object Number of the closest object at the specified screen coordinates. The objects that are tested against the 2D coordinate are only those within the Object Start and Object End range in order to speed up specific tests. If no object exists at the coordinate, a value of zero is returned. If an object number is returned, additional data will be generated and stored internally. This extra data can be retrieved using the dbGetPickVector and dbGetPickDistance commands.

Syntax
int dbPickObject ( int iX, int iY, int iObjectStart, int iObjectEnd )

Yeah, thanks