抱歉，如果这是重复的，但我正在尝试找出 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节点，以便我可以平移、旋转等。我有三个节点：桌子、灯和框架（相框）。但是，我不认为我的代码完全正确。我也有各种方法，例如 MouseButtonCallback（它将检查鼠标是否被单击，然后使用导航器）和 MouseMoveCallback（相同的想法）。所以这是我的代码，但你有什么建议吗？现在，好吧，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;
}
您是否还知道 OpenInventor 中可以在场景中“放置”节点的动作，即将台灯放置在桌面上，将框架放置在墙上等。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：这看起来怎么样？SoSeparator *desk2; SoSeparator *lamp2; SoSeparator *pic_frame2; SoSeparator *选中；
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);