trans.LookAt(vector from object to point, normal object up direction);
this works for me most of the time. A camera has an up of 0,0,1 an object is
default 0, 1, 0 or thats what I see.
----- Original Message -----
From: Mario Lapin
To: crystal-main@lists.sourceforge.net
Sent: Tuesday, November 28, 2006 6:19 PM
Subject: [CsMain] How to have an arrow-like mesh pointing to a givendirection
Hi all,
I'm putting the question back to the top of the list, in the hope that
someone else might read it. I'm trying hard to solve it, though unsuccessfully.
TIA.
--
I'm coding a visual representation of an arrow-like vector that would make it
possible for the user to actually see a direction in 3D space, for educational
purposes. First, it would be possible for the user to move (rotate) the arrow,
turning it to a new direction, returned as a world-space csVector3. Second, the
user might also supply a world-space csVector3, and then the arrow should point
to it. The 3D vector representation was modeled on Blender as an arrow starting
at (0,0,0) and pointing to (0,1,0), in CS coordinate system, and then a
MeshWrapper is instantiated from the iMeshFactoryWrapper loaded from file.
Well, the first objective was achieved with the following code :
csRef<iMeshWrapper> arrow;
csVector3 direction;
...
direction =
(arrow->GetMovable()->GetTransform().This2OtherRelative(csVector3(0, 1, 0)));
However, I can't realize how to do the contrary, i.e.,, having the arrow to
point to a given "csVector3 direction" in world space. I supposed that the
following code might work, but it doesn't:
// Given direction
csVector3 direction(...);
...
csReversibleTransform trans;
trans = arrow->GetMovable()->GetTransform();
csVector3 trans_direction = trans.Other2ThisRelative(direction);
trans.LookAt(trans_direction, trans.GetUp());
arrow ->GetMovable()->SetTransform(trans);
I ask you if someone could kindly suggest how to obtain the desired results,
as I've ran out of ideas!!! I would be very glad to give any other required
information.
Thank you in advance!
Best regards,
Mario.
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