Hi osg users,
I'm currently using openscenegraph for my class project to simulate traffic. I
have a problem in that , i need to find collision detection between consecutive
cars and stop the car if there is a collision. I have followed the
osgExample- for animation. I have used an animationpath and
animationpathcallback and i have implemented my own spline interpolation for
the car to traverse on a spline. I tried to get the world coordinate of the
bounding box like this..
* i have a class Vehicle that stores the node to which an openflight model is
read into.
* the leaf node is the node having the vehicle, the parent node of this node is
a transformation node which has an animationpathcallback set to, and this also
has a parent node to initially set the location and orientation, (just like in
the osgExample animation).
* i have a node visitor that traverses parents..so it goes from the current
node to the root concatenating all the world coordinates.
* then i get the local bounding box of the node and get the minimum and maximum
and multiply the world coord matrix with these points to form a new min and max
point and create a new bounding box. I do this for every two node to check the
intersection of two consecutive nodes.
//getWorldCoords() - forwards to a nodevisitor to get world coords matrix.
osg::Matrixd* WorldCoordsMatrix = getWorldCoords(this->m_Vehicle) ;
osg::BoundingBox VehicleBBox ;
VehicleBBox.expandBy(m_Vehicle->getBound()) ;
//Convert the vehicle local coords to world coordinates.
osg::Vec3f MinPt(VehicleBBox.xMin() , VehicleBBox.yMin() ,
VehicleBBox.zMin()) ;
osg::Vec3f MaxPt(VehicleBBox.xMax() , VehicleBBox.yMax() ,
VehicleBBox.zMax()) ;
osg::Vec3f NewMinPt , NewMaxPt ;
NewMinPt = MinPt * (*WorldCoordsMatrix) ;
NewMaxPt = MaxPt * (*WorldCoordsMatrix) ;
this->m_VehicleBoundingBox = new osg::BoundingBox(NewMinPt , NewMaxPt) ;
I am not getting correct results. I get that the bounding boxes dont intersect
at all or sometimes intersect at odd places. Please let me know if i'm doing
something stupid or if i my understanding of anything wrong.
Thank you,
Yours Sincerely,
Siddharth
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