[fixed in 1.7] Picking

[dehseth]

I would like to pick objects with mouse cursor. I have tried getting ray line using getRayFromScreenCoordinates function, and I have used getSceneNodeAndCollisionPointFromRay / getSceneNodeFromRayBB functions. I also find some code pice about getting ray line and tried two different ray-triangle functions from web... Well none of these methods work!

And getSceneNodeFromRayBB picks objects when my camera position is at (0, 20, -25), after rotating my cam to (-1, 20, 25) point this method does not return any scene node...

[Seven]

http://irrlicht.sourceforge.net/phpBB2/ ... highlight=

[hybrid]

Well, I don't see any necessity that a node is picked at (0,20,-25), but not at (-1,20,25). Looks like a pretty different direction. So unless you can specify your problem in more detail, with a failing test application, I'd consider this description simply wrong usage of the properly working methods.

[dehseth]

@Seven I copied this line from sample code in your link but it caused the same problem

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return g_smgr->getSceneCollisionManager()->getSceneNodeFromScreenCoordinatesBB(g_device->getCursorControl()->getPosition(), 0, true); 

@hybrid Let me try to explain what I have got step by step:

my device and globals

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g_device = createDevice(irr::video::E_DRIVER_TYPE::EDT_DIRECT3D9, core::dimension2d<u32>(640, 480));
g_driver = g_device->getVideoDriver();
g_smgr = g_device->getSceneManager();

how did I load objects

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scene::IAnimatedMesh* meshTahta = g_smgr->getMesh(meshFilePath);
m_node = g_smgr->addOctTreeSceneNode(meshTahta->getMesh(0), 0, 1);

camera

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scene::ICameraSceneNode* cam = g_smgr->addCameraSceneNode(0, core::vector3df(0, 20, -25), core::vector3df(0,0,0));
cam->setNearValue(0.1f);
cam->setPosition(core::vector3df(0, 20, -25));
cam->setTarget(core::vector3df(0, 0, 0));

how did I rotate camera

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if (keys[irr::KEY_KEY_W])
			{
				core::vector3df m = cam->getTarget() - cam->getPosition();
				m.normalize();
				m *= 0.05f;
				cam->setPosition(cam->getPosition() + m);
			}
			else if (keys[irr::KEY_KEY_S])
			{
				core::vector3df m = cam->getPosition() - cam->getTarget();
				m.normalize();
				m *= 0.05f;
				cam->setPosition(cam->getPosition() + m);
			}
			else if (keys[irr::KEY_KEY_A])
			{
				core::vector3df m = cam->getTarget() - cam->getPosition();
				m.normalize();
				m.rotateXZBy(90);
				m.Y = 0;
				m *= 0.05f;
				cam->setPosition(cam->getPosition() + m);
			}
			else if (keys[irr::KEY_KEY_D])
			{
				core::vector3df m = cam->getTarget() - cam->getPosition();
				m.normalize();
				m.rotateXZBy(-90);
				m.Y = 0;
				m *= 0.05f;
				cam->setPosition(cam->getPosition() + m);
			}

piece selecting

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if (selectedPiece) 
{
	selectedPiece->getMaterial(0).Wireframe = false;
	selectedPiece->setDebugDataVisible(scene::E_DEBUG_SCENE_TYPE::EDS_OFF);
}
			
if ((selectedPiece = GetRayCastNode(pieces, cam))) 
{
	//getSceneNodeFromRayBB(ray);
	selectedPiece->getMaterial(0).Wireframe = true;
 selectedPiece->setDebugDataVisible(scene::E_DEBUG_SCENE_TYPE::EDS_BBOX);
}

And GetRayCastNode function is

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return g_smgr->getSceneCollisionManager()->getSceneNodeFromScreenCoordinatesBB(g_device->getCursorControl()->getPosition(), 0, false); 

After rotating cam selection does not work.. I am using 1.6v. If you need code I can provide... Thanks...

[CuteAlien]

Just wondering as it looks a little suspicious - do you really want assignment here or is that a type and you wanted == to compare the resulting node with selectedPiece?

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if ((selectedPiece = GetRayCastNode(pieces, cam))) 

In any case - having a minimal code example which can be compiled to reproduce the problem certainly always helps. And it's easier and less work for you to write that, as you already have that bug, as it would be for us.

[dehseth]

@CuteAlien Ok I will try to write a small code and generate this.

And for the code you may think it as:

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if ((selectedPiece = GetRayCastNode(pieces, cam)) != NULL) 

[dehseth]

Ok I have uploaded sample file and code. You can download it from here: http://www.2shared.com/file/10853547/57 ... rDemo.html

I am using v1.6. The demo exe file is compiled in DEBUG mode. If you cannot run it you can compile the source code. When running exe file, you can pick object successfully; after rotating camera upto 180 degrees using keys A or D, you won't be able to pick the object with mouse cursor..

[hybrid]

This is fixed in Irrlicht 1.7. Just tested your code.

[dehseth]

Ok thank you hybrid.. When can I have the v1.7? Do you know the release date? I rather use release than SVN...

[CuteAlien]

1.7 release should be in February.