Collada model picking?

[gerardogc2378]

Hi, reading much of minko code I found picking example to pick only primitive shapes like cube and spheres, what about collada model picking? How to do picking with collada 3d models?

[warrenseine]

It's exactly the same. Just place your model's root node in the PICKING layout. Then catch it with the mouseClick signal.

[gerardogc2378]

Hi @warrenseine, I have this simple code:

auto daeModel = sceneManager->assets()->symbol(DAE_MODEL);
daeModel->layout(scene::BuiltinLayout::DEFAULT | scene::BuiltinLayout::PICKING);
root->addChild(daeModel);

root->addComponent(Picking::create(camera, false, true));
pickingMouseClick = root->component<Picking>()->mouseClick()->connect([=](scene::Node::Ptr node)
{                                                                         
    std::cout << "Mouse Click: " << node->name() << std::endl;
}

Clicking it's not working...

[warrenseine]

Sounds like the right way to do it. Does it work in your code if you replace the Collada model by a simple native shape?

[gerardogc2378]

Yes working with simple native shapes on branch master

auto ground = scene::Node::create("ground")                               
        ->addComponent(Surface::create(                                         
            geometry::QuadGeometry::create(sceneManager->assets()->context()),  
            material::BasicMaterial::create()->diffuseColor(vec4(1.f, .5f, .5f, 1.f)),
            sceneManager->assets()->effect("effect/Phong.effect")))             
        ->addComponent(Transform::create(scale(vec3(4.f)) * rotate(static_cast<float>(-M_PI_2), vec3(1.f, 0.f, 0.f))))
        ->layout(scene::BuiltinLayout::DEFAULT | scene::BuiltinLayout::PICKING) 
      ;                                                                         
      root->addChild(ground);

[JMLX42]

auto daeModel = sceneManager->assets()->symbol(DAE_MODEL);
daeModel->layout(scene::BuiltinLayout::DEFAULT | scene::BuiltinLayout::PICKING);

Picking is done using a GPU picking map rendered by a Renderer working on all the Surface components that are in the scene::BuiltinLayout::PICKING layout. So I think you need to add the meshes to the scene::BuiltinLayout::PICKING layout, not just the root of the model.

You can define your own file::Options::nodeFunction that will be called on all node upon loading to make sure the relevant ones are in the right layout:

fileOptions->nodeFunction([](scene::Node::Ptr n)
{
  if (n->hasComponent<component::Surface>())
    n->layout(n->layout() | scene::BuiltinLayout::PICKING);
}
// load the dae with those options

[gerardogc2378]

Thanks @promethe42 I will try this code and comment later.

[gerardogc2378]

Hi @promethe42 , I have another question, is there a way in minko to set a collision shape like this and make it touchable?

[JMLX42]

There are many things on that picture... what's supposed to be the collision shape? By "touchable", do you mean clickable with the touchscreen?

[gerardogc2378]

Hi @promethe42 again, collision shape is the blue-light cube, Of course touchable is clickable :-)

[JMLX42]

Just add the picking component to that shape. What's stopping you?

[gerardogc2378]

Hi @promethe42 thanks again for your support. One and mainly is my spare time to learn minko (minko is awesome technology) but I have had progress step by step :D