Hi Antonio,
On Fri, 2005-11-25 at 13:13 +0100, antonio_lioy wrote:
> Sorry for annoying once more. I'm sending pictures of my cave.
> As you can see in one of them there's little distorsion , while in the
> other the red line appears to be broken.
What's the difference between the two pictures, i.e. what do you do to
get one or the other?
> I realize that probably I'm doing something wrong with the navigation,
> cause I'm a bit confused with coordinate systems.
> Our tracking system has a local coordinate with origin in the center
> of our room and axis that are aligned to the CAVE walls.
OK.
> I used a perspective camera that is looking down Z axis position =>
> (0,0,10). This camera has four ProjectionCameraDecorator (2 for each
> eye), and I'm passing the decorators the points of CAVE walls in
> tracking coordinates.
The Camera doesn't really matter, only the beacon is used, the actual
projection is defined by the Decorators.
> For navigation purposes I'm using a Navigator that acts on the beacon
> of our camera (the user Node of the decorator is initialized to
> identity matrix).
OK.
> What I don't understand at the moment is: what is the relation
> between the coordinate system of my tracking system and the
> coordinate systems that OpenSG uses to draw on the screens? I think I
> should think to project the coord system in my cave on the two walls,
> as if the projection plane were the wall of my cave... Uhm, there's
> something wrong but I don't know what it is.
All that depends on where the head is. Unless the head is exactly in the
origin, you will never see the coordinate axes projected straight onto
the walls.
Where do you put the matrix that you get from your tracker? You should
have a Node (the User of the Decorator) with a Transform core under your
navigation beacon, which contains the Matrix you get from the tracker,
plus some correction for the offset between tracker and ete position
(see my last mail).
Hope it helps
Dirk
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