Linepick and positioning an object, but exact

currentSelection = CameraPick(camera,MouseX(),MouseY())
PositionEntity currentSelection , PickedX#() , PickedY#(), PickedZ#()

With the code above, I can position an object in 3D space, using the mosue coordinates. No big deal.

But here is the problem. (I hope I can explain it right, it's hard)

When I click on the edges of the object, I do not want the object to move so that my mouse is in the middle point of the object. I want my camerapick position to be the basepoint of my selected object.

Imagine a mesh of a big truck. If I click on a wheel, the truck will be moved down, and my mesh will be centered on the camerapick x,y,z coordinates. I don't want this, I want the truck wheel to be the basepoint of moving.

Can someone shine a light on this?

Thanks

Find out the exact 3D coordinates of the pick, place a pivot there, parent the truck to the pivot, and now move the pivot with the mouse. When the mouse is released unparent the truck from the pivot and freeentity the pivot.

hmmmm good idea!
I'll try!

I hope that works. I haven't actually tested it or anything, that was just the first idea which came to me.

[quote]
Find out the exact 3D coordinates of the pick, place a pivot there, parent the truck to the pivot, and now move the pivot with the mouse. When the mouse is released unparent the truck from the pivot and freeentity the pivot.
[.quote]

That was also what I thought, only I wonder about problems with numerous 'pickable' objects, or when a 'blank' area is clicked...

I'm not sure what problems you are referring to with numerous objects. As for clicking a blank area, before placing a pivot check if an object was picked:

If PickedEntity<>0

pivot=CreatePivot()
PositionEntity pivot,PickedX(),PickedY(),PickedZ()
etc.

EndIf