getRayFromScreenCoordinates problem

[blackMasoon]

Hello. I have a serious problem with that method with getting ray from screen coordinates. I passed the right 2d pos and an active camera, but it casts the ray in a completely different place in the scene. And the start point is not the camera position... One important thing is.. that the scene is beeing drawn in a different viewport. But setting it also for calculating the ray does not take an effect. I also draw the 2d pos on screen to make sure if it's right... and it is... So what may be a problem here?

[CuteAlien]

Can you try with latest svn-trunk version? I changed something in getRayFromScreenCoordinates a few days ago in a similar problem when using renderToTarget.
edit: Hm, forget it - I changed getScreenCoordinatesFrom3DPosition not getRayFromScreenCoordinates :-(

[blackMasoon]

The problem looks like it doesn't take the right camera position to start the ray from. And the camera with it's position is initialized for sure before using that method...
Here is the code:

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        scene::IMeshSceneNode *surface = smgr->addCubeSceneNode(100,0,999,core::vector3df(0,-0.4,0), core::vector3df(0,0,0), core::vector3df(10,0.001,10));
 
        core::array<scene::IMeshSceneNode*> car_box;
        core::line3df temp_ray;
        core::vector3df collisionPoint3D; // globalny punkt kolizjii
        core::triangle3df collisionTriangle; // globalny trójkąt kolizjii
        const scene::ISceneNode *hitNode;
        scene::ITriangleSelector * selector;
        
        selector  = smgr->createTriangleSelector(surface->getMesh(), surface);
        for(int i = 0; i <number_of_cars; ++i)
        {
                for(int j = 0; j < car[i].pos.size() ; ++j)
                {
                        temp_ray = smgr->getSceneCollisionManager()->getRayFromScreenCoordinates(car[i].pos[j], smgr->getActiveCamera());
                        smgr->getSceneCollisionManager()->getCollisionPoint(temp_ray, selector, collisionPoint3D, collisionTriangle, hitNode);
                        collisionPoint3D.Y = 0.2f;
                        car[i].pos3d.push_back(collisionPoint3D);
                }       
                car_box.push_back(smgr->addCubeSceneNode(0.1,0,i,car[i].pos3d[0]));     
                
        }
     
 
 

And in the run loop i modify viewport before drawing the scene like this:

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driver->setViewPort(core::rect<s32>(10,230,556,660));
 

[CuteAlien]

It uses the viewport set in the driver. Maybe it is not set at that moment?
Maybe just copy CSceneCollisionManager::getRayFromScreenCoordinates and adapt it to you needs.

[blackMasoon]

Ok... so I took the method code from SVN and mofified:

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if (camera->isOrthogonal())
                ln.start = f->cameraPosition + (lefttoright * (dx-0.5f)) + (uptodown * (dy-0.5f));
        else
        ln.start =f->cameraPosition;
 

to:

Code: Select all

 
if (camera->isOrthogonal())
                ln.start = camera->getPosition() + (lefttoright * (dx-0.5f)) + (uptodown * (dy-0.5f));
        else
        ln.start =camera->getPosition();
 

And now everything seems to be ok... but there's one thing wrong... it all casts the ray like the whole scene was rotated by 45 deg in Y axis... Why is this happening?

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