Display custom bounding boxes

[Dr_Asik]

Hi,

I have created some custom bounding boxes (aabbox3df) based on some calculations on the geometry. Now I'd like to verify that they are correct by displaying them. I know that you can do:

Code: Select all

node->setDebugDataVisible(scene::EDS_BBOX);

to show a model's bounding box, but here it's not a model's bounding box, it's just some bounding boxes I've created myself and stored in a std::vector somewhere, which are not attached to any particular model.

Thanks for the help.

[Dr_Asik]

Nvm, found it (m_driver->draw3DBox()).

Now I have a weird problem. My nodes are set with no parent. I therefore assume getPosition() returns their absolute position, since having no parent == having 0,0,0 as the reference position, if I am not mistaken.

Now when I draw them, my bounding boxes appear to be translated by a certain amount compared to the shapes they are supposed to be laying upon, as if there was a delta in positions. I got the shape's position by using their getPosition() and basically used that to place the bounding boxes. What could be wrong?

[blAaarg]

Pretty much all draw*() operations are done by the video device using whatever transformation was last used by the card.

IGUIEnvironment::drawAll () and ISceneManager::drawAll () set video device states for you before all the different draw operations they, then, call to the IVideoDevice. The other draw operations, however, call directly to the IVideoDevice but don't (re)set the state first. So, you may need to reset the transformations before calling draw3dBox().

According to the API:

virtual void irr::video::IVideoDriver::draw3DBox ( ...)

This method simply calls draw3DLine for the edges of the box. Note that the box is drawn using the current transformation matrix and material. So if you need to draw it independently of the current transformation, use

driver->setMaterial(someMaterial);
driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);

for some properly set up material before drawing the box.

Whatever ISceneManager::setPosition/Rotation/Scale operations you call won't be used by the IVideoDevice when using IVideoDevice::draw*() operations. They're ignored by the video device.

[vitek]

The code I posted in this thread shows three different ways to draw a node bounding box.

Travis