How do I set a CameraMask to a PhysicsBody?

cocos2d-x C++
#1

Hi everybody, I have a problem with setCameraMask method.
So, in function Init I define a camera:

    _camera = Camera::createPerspective(60, visibleSize.width / visibleSize.height, 
    100, 1100);
    _camera->setAnchorPoint(cocos2d::Vec2(0.5f, 0.5f));
    _camera->setPosition3D(Vec3(x, y, z));
    _camera->setCameraFlag(CameraFlag::USER1);
    this->setCameraMask(static_cast<unsigned short> (CameraFlag::USER1), true);
    this->addChild(_camera, 4);

When I add a new sprite with the next function

auto position = _camera->getPosition();

	auto node = Sprite::create("images/node_1.png");
	node->setAnchorPoint(Vec2(0.5f, 0.5f));
	node->setPosition(position);
	node->setScale(0.3f);
	auto radiu = node->getContentSize().height / 2;
	auto node_body = PhysicsBody::createCircle(radiu, PHYSICSBODY_MATERIAL_DEFAULT, Vec2::ZERO);
	node->setPhysicsBody(node_body);
	node->setCameraMask(static_cast<unsigned short> (CameraFlag::USER1), true);
    this->addChild(node,2);

the following happens
1

but if I use the next function for move the camera

	auto position3Ds = _camera->getPosition3D();
	position3Ds.x += 10.0f;
	_camera->setPosition3D(position3Ds);

the following happens
2

The sprite doesn’t change its position but its PhysicsBody does it.

Has anyone had the same problem? Can anybody help me?

Sorry, my English is bad :frowning:

1 Like
#2

You haven’t given enough consecutive code. Mentioning next function doesn’t help us to visualize the complete work flow. Can you post more consecutive code?

#3

I am running into a similar issue.

Here is my code for moving the camera:

virtual void onKeyboardEvent(EventKeyboard::KeyCode keyCode, bool isPressed) override
{
	if (!isPressed)
		return;

	switch (keyCode)
	{
	case EventKeyboard::KeyCode::KEY_LEFT_ARROW:
		if (auto camera = Camera::getDefaultCamera())
			camera->runAction(MoveBy::create(0.2f, -Vec2::UNIT_X * 5));
		break;

	case EventKeyboard::KeyCode::KEY_RIGHT_ARROW:
		if (auto camera = Camera::getDefaultCamera())
			camera->runAction(MoveBy::create(0.2f, Vec2::UNIT_X * 5));
		break;
	}
}

And here is my code for moving Nodes with PhysicsBodys attached:

Vec2 positionInNode;

void AddTouchListenerToNode(Node* node)
{
	auto touchListener = EventListenerTouchOneByOne::create();
	touchListener->setSwallowTouches(true);
	touchListener->onTouchBegan = [](Touch* touch, Event* event)
	{
		auto node = event->getCurrentTarget();
		auto bounds = node->getBoundingBox();
		auto position = node->convertTouchToNodeSpace(touch);

		bounds.origin.setZero();
		if (!bounds.containsPoint(position))
			return false;

		auto parent = node->getParent();
		auto positionInParent = parent->convertTouchToNodeSpace(touch);
		auto nodePosition = node->getPosition();
		positionInNode = positionInParent - nodePosition;

		if (auto physicsBody = node->getPhysicsBody())
		{
			physicsBody->setGravityEnable(false);
			physicsBody->setDynamic(false);
			physicsBody->setAngularVelocity(0.0f);
			physicsBody->setVelocity(Vec2::ZERO);
		}
		return true;
	};
	touchListener->onTouchMoved = [](Touch* touch, Event* event)
	{
		auto node = event->getCurrentTarget();
		auto parent = node->getParent();
		auto positionInParent = parent->convertTouchToNodeSpace(touch);
		node->setPosition(positionInParent - positionInNode);

		if (auto physicsBody = node->getPhysicsBody())
		{
			physicsBody->setAngularVelocity(0.0f);
			physicsBody->setVelocity(Vec2::ZERO);
		}
		return true;
	};
	touchListener->onTouchEnded = [](Touch* touch, Event* event)
	{
		auto node = event->getCurrentTarget();
		auto parent = node->getParent();
		auto positionInParent = parent->convertTouchToNodeSpace(touch);
		node->setPosition(positionInParent - positionInNode);

		if (auto physicsBody = node->getPhysicsBody())
		{
			physicsBody->setGravityEnable(true);
			physicsBody->setDynamic(true);
		}
		return true;
	};

	node->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchListener, node);
}

If the camera is not moved, I can successfully move the one of the physics-enabled Nodes, but when the camera is moved, I have to apply a negative offset of the camera position to the point on the screen that I must use to be able to move the Node.

To summarize, the problem that I am encountering is that the Node::convertTouchToNodeSpace() does not take into account the camera’s matrix. Is there a function that can convert screen-space coordinates into Node-space coordinates while taking into account a camera’s view matrix?