It appears that the issue was slightly different than I had expected. The
information I was getting from physx from the global position and
orientation calls were not correct. I switched those calls to cmassglobal
calls and now the simulation seems to be acting more reasonably. I also
encountered an axis flipping situation that I am now trying to resolve.
Thank you all for your input.
On 4/24/07, Michael Bosse' <[EMAIL PROTECTED]> wrote:
Hello. I am currently working on an implementation of a physics viewer
application that utilizes openscenegraph and Ageia PhysX (to control the
bodies in the simulation). So far my implementation is as follows. The root
node is a group node. I load my model graphic file up and attach it to a
position attitude transform node which I then attach to the root node. For
every step of the physics simulation, I get a position vector and a quad
from PhysX which I then apply to the PAT. The issue that I am experiencing
is that it appears that when I attempt to update both position and rotation
the models do not act properly. It is almost as if I am rotating the PAT
instead of the model.
Here is a simple example of what I am doing:
//standard calls to viewer. members
//Update physics simulation update
(inside render loop)
NxActor** PhysicsActors = gPhysicsScene->getActors();
NxVec3 PhyPos;
NxQuat PhyRot;
PhyPos = (PhysicsActors[1])->getGlobalPosition();
PhyRot = (PhysicsActors[1])->getGlobalOrientationQuat();
osg::Node* GraphicsActor = gRoot->getChild(0); //In this example, only
rotate the first object..
dynamic_cast<osg::PositionAttitudeTransform*>(GraphicsActor)->setPosition(osg::Vec3d(
PhyPos.x, PhyPos.y, PhyPos.z));
osg::Quat GraphRot;
GraphRot.set( static_cast<osg::Quat::value_type>( PhyRot.x),
static_cast<osg::Quat::value_type>(PhyRot.y),
static_cast<osg::Quat::value_type>(PhyRot.z),
static_cast<osg::Quat::value_type>(PhyRot.w));
dynamic_cast<osg::PositionAttitudeTransform*>(GraphicsActor)->setAttitude(
GraphRot);
(end of render loop)
If anyone is familiar with both of these systems, and wouldn't mind
explaining what I am doing wrong, I would be very grateful.
Mike Bosse'
--
"It is only necessary to make war with five things: with the maladies of
the body, with the ignorances of the mind, with the passions of the body,
with the seditions of the city, with the discords of families." - Tacitus
"The desire for safety stands against every great and noble enterprise." -
Tacitus
"Those who would give up essential liberty to purchase a little temporary
safety deserve neither liberty nor safety." - Benjamin Franklin
--
"It is only necessary to make war with five things: with the maladies of the
body, with the ignorances of the mind, with the passions of the body, with
the seditions of the city, with the discords of families." - Tacitus
"The desire for safety stands against every great and noble enterprise." -
Tacitus
"Those who would give up essential liberty to purchase a little temporary
safety deserve neither liberty nor safety." - Benjamin Franklin
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