抱歉，如果这是重复的话，但是我试图找出Open Inventor中SoRayPickAction的实现。我正在尝试实现它，以便在单击鼠标时选择一个特定的节点，以便可以平移，旋转等。我有三个节点: table ，灯和框架(相框)。但是，我认为我的代码没有问题。我也有多种方法，例如MouseButtonCallback(将检查是否单击了鼠标，然后使用导航器)和MouseMoveCallback(相同的想法)。这是我的代码，但是您有什么建议吗？现在，它什么也没做。
SbViewportRegion viewport(400,300);
SoRayPickAction m(viewport);
m.setRay(SbVec3f(0.0,0.0,0.0), SbVec3f(0.0,0.0,-1.0));
m.apply(callback_node);
const SoPickedPoint *mpp = m.getPickedPoint();
if(mpp != NULL) {
std::cout << "test" << std::endl;
}
您可能还知道OpenInventor中的一个可以“放置”场景中的节点的 Action ，即，将灯放置在 table 顶部，框架在墙上等，它是否带有路径？不幸的是，我什至不知道我在寻找什么。非常感谢你的帮助!!
编辑:这看起来如何？
SoSeparator * desk2;
SoSeparator * lamp2;
SoSeparator * pic_frame2;
SoSeparator *已选择；
void MouseButtonCallback(void* data, SoEventCallback* node)
{
SoHandleEventAction* action = node->getAction();
const SoMouseButtonEvent* event = static_cast<const SoMouseButtonEvent*>(action- >getEvent());
Navigator* nav = static_cast<Navigator*>(data);
if (SoMouseButtonEvent::isButtonPressEvent(event, event->getButton()))
nav->OnMouseDown(event, action);
else
nav->OnMouseUp(event, action);
const SbViewportRegion & viewportRegion = action->getViewportRegion();
SoRayPickAction pickAction(viewportRegion);
SbVec2s mousePos = event->getPosition(viewportRegion);
pickAction.setPoint(mousePos);
pickAction.setPickAll(TRUE);
pickAction.setRadius(2.0F);
pickAction.setRay(SbVec3f(0.0,0.0,0.0), SbVec3f(0.0,0.0,-1.0));
pickAction.apply(node);
const SoPickedPoint *mpp = pickAction.getPickedPoint();
if(mpp != NULL) {
SoPath *path = mpp->getPath();
if(desk2 != NULL && path->containsNode(desk2))
{ //but this doesn't respond with cout when I try to test it :(
if (SoMouseButtonEvent::isButtonPressEvent(event, event->getButton()))
*picked = *desk2;
}
else if(lamp2 != NULL && path->containsNode(lamp2))
{
if (SoMouseButtonEvent::isButtonPressEvent(event, event->getButton()))
*picked = *lamp2;
}
else if(pic_frame2 != NULL && path->containsNode(pic_frame2))
{
if (SoMouseButtonEvent::isButtonPressEvent(event, event->getButton()))
*picked = *pic_frame2;
}
action->setHandled();
}
void MouseMoveCallback(void* data, SoEventCallback* node)
{
SoHandleEventAction* action = node->getAction();
const SoLocation2Event* event = static_cast<const SoLocation2Event*>(action->getEvent());
Navigator* nav = static_cast<Navigator*>(data);
nav->OnMouseMove(event, action);
const SbViewportRegion & viewportRegion = action->getViewportRegion();
SoRayPickAction pickAction(viewportRegion);
SbVec2s mousePos = event->getPosition(viewportRegion);
pickAction.setPoint(mousePos);
pickAction.setPickAll(TRUE);
pickAction.setRadius(2.0F);
pickAction.setRay(SbVec3f(0.0,0.0,0.0), SbVec3f(0.0,0.0,-1.0));
pickAction.apply(node);
const SoPickedPoint *mpp = pickAction.getPickedPoint();
if(mpp != NULL) {
SoPath *path = mpp->getPath();
if(desk2 != NULL && path->containsNode(desk2))
{
*picked = *desk2; //can't remember how to set pointers, will figure that out
}
else if(lamp2 != NULL && path->containsNode(lamp2))
{
*picked = *lamp2;
}
else if(pic_frame2 != NULL && path->containsNode(pic_frame2))
{
*picked = *pic_frame2;
}
}
action->setHandled();
}
(part of main method)
//desk
SoTransform *desk_transform = new SoTransform;
desk_transform->translation.setValue(SbVec3f(380,340,330));
SoSeparator* desk2 = new SoSeparator();
desk2->addChild(desk_transform);
desk2->addChild(desk);
root->addChild(desk2);
SoTransformerManip* picked_transform = new SoTransformerManip();
picked_transform->translation.setValue(SbVec3f(200,340,330));
SoSeparator* pick2 = new SoSeparator();
pick2->addChild(picked_transform);
pick2->addChild(picked);
root->addChild(pick2);
std::auto_ptr<btCollisionShape> picked_shape(new btBoxShape(btVector3(10.0f, 10.0f, 10.0f)));
CollisionEngine* picked_collision = new CollisionEngine(collision_world.get(), picked_shape.get());
picked_collision->translation_in.connectFrom(&picked_transform->translation);
picked_collision->rotation_in.connectFrom(&picked_transform->rotation);
picked_transform->translation.connectFrom(&picked_collision->translation_out);
最佳答案
您已经选择了要点。然后，您会猜到一个SoPath。然后查看该路径是否包含您要对其进行处理的节点。
SbViewportRegion viewport(400,300);
SoRayPickAction m(viewport);
m.setRay(SbVec3f(0.0,0.0,0.0), SbVec3f(0.0,0.0,-1.0));
m.apply(callback_node);
const SoPickedPoint *mpp = m.getPickedPoint();
if(mpp != NULL) {
std::cout << "test" << std::endl;
SoPath * path = pickedPoint->getPath();
if (deskSeparator != NULL && path->containsNode(deskSeparator)
{
}
else if (lampSeparator != NULL && path->containsNode(lampSeparator)
{
}
else if (radomeSeparator != NULL && path->containsNode(radomeSeparator)
{
if ( SoMouseButtonEvent::isButtonPressEvent( event, SoMouseButtonEvent::BUTTON2 )
|| ( SoMouseButtonEvent::isButtonPressEvent( event, SoMouseButtonEvent::BUTTON1 ) && event->wasShiftDown() ) )
{
modelPointMoving = true;
const SoDetail * detail = modelPickedPoint->getDetail( 0 );
int face = -1;
if ( detail && detail->isOfType( SoFaceDetail::getClassTypeId() ) )
{
const SoFaceDetail * faceDetail = static_cast<const SoFaceDetail *>( detail );
face = faceDetail->getFaceIndex();
}
updateStatusBar( face, point.getValue(), normal.getValue() );
graphicModel.postNote( pickedPoint );
break;
}
else if ( SoMouseButtonEvent::isButtonPressEvent( event, SoMouseButtonEvent::BUTTON1 ) )
{
}
else if ( SoMouseButtonEvent::isButtonReleaseEvent( event, SoMouseButtonEvent::BUTTON1 ) )
{
}
}
}
您最终将要像下面这样将拾取光线连接到鼠标位置:
// Set an 2-pixel wide region around the pixel.
SbVec2s mousePosition = event->getPosition( viewportRegion );
pickAction.setPoint( mousePosition );
pickAction.setPickAll( TRUE );
pickAction.setRadius( 2.0F );
这是在您
.apply()当然选择操作之前完成的。我想我的代码是您和我的代码的混合体，但我认为它应该为您提供一个开始。另外，它位于处理鼠标事件的函数中:
void
RenderWindow::mouseEvent( void *, SoEventCallback * eventCallback )
{
const SoEvent *event = eventCallback->getEvent();
if ( ! event )
{
qDebug() << " ** Error in mousePressCallback: Event not found.";
return;
}
//SoType eventType = event->getTypeId();
//SbName eventTypeName = eventType.getName();
//const char * eventTypeString = eventTypeName.getString();
SoHandleEventAction * action = eventCallback->getAction();
const SbViewportRegion & viewportRegion = action->getViewportRegion();
SoRayPickAction pickAction( viewportRegion );
在主程序或设置例程中，我注册了鼠标事件(用于单击 Action 和位置(将鼠标移到视口(viewport)上)):
// Add a mouse event callback to catch mouse button presses.
SoEventCallback * mouseEventCallback = new SoEventCallback();
mouseEventCallback->setName( "MOUSE_EVENT_CALLBACK" );
mouseEventCallback->addEventCallback( SoMouseButtonEvent::getClassTypeId(), &::mouseEvent, static_cast<void *>( this ) );
// Add a mouse event callback to catch mouse motion.
mouseEventCallback->addEventCallback( SoLocation2Event::getClassTypeId(), &::mouseEvent, static_cast<void *>( this ) );
rootSeparator->addChild( mouseEventCallback );
现在，我看了一下，我以相反的顺序写了块；-)。对不起。
祝你好运
关于c++ - Open Inventor中的SoRayPickAction？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10607792/