mouseray = smgr->getSceneCollisionManager()

[le2015]

Thank you, the problem is solved)

[CuteAlien]

It's definitely not random. As Irrlicht is opensource you can directly look at the function (CSceneCollisionManager::getRayFromScreenCoordinates), it's pretty short and you can see yourself the calculation. Basically it's the corresponding point of the far-plane of the view frustum.

If this goes wrong the reason is likely in the surrounding code. Try to make a short example so I can reproduce it, then I can help more.

[le2015]

the problem is solved)

[CuteAlien]

Sorry, I have no idea what you mean with "good". I need a real example. How do you _know_ it's good or bad?

Note that drawing that line is tricky - because it starts exactly at the center of the camera and then goes along the view-line. So if you draw it - you only get a point. It's like if you have straight line connected from one eye to any point in your room. You can't see that line itself then with that eye!

You can for example draw from the start of the center of the near-plane instead. Thought it's confusing as you lose perspective (looks just like a 2d line). But you would get that with:

Code: Select all

const scene::SViewFrustum* frustum = camera->getViewFrustum();
ray.start = frustum->getNearLeftUp() + (frustum->getNearRightDown()-frustum->getNearLeftUp())*0.5f;

Or you can draw from the point of a weapon or hand or so to the end. That will also work. Thought you better use a real 3d object which gets perspective drawing for that.

But to show you get the correct ray you can modify the ray calculation in example 07 with this code (will more or less give the same result as old one):
ray = collMan->getRayFromScreenCoordinates( device->getCursorControl()->getPosition() );
You will still get the correct collisions.

[le2015]

Thank you, the problem is solved)

[le2015]

Thank you, the problem is solved)