[bug] Camera zNear not working as expected?

[erictheturtle]

Maybe I don't actually understand how the zNear and zFar work with cameras.

I thought it worked like this.


But that's not the result I'm getting. For an easy example, start with the 01.HelloWorld example, and change this line:

Code: Select all

	smgr->addCameraSceneNode(0, vector3df(0,30,-40), vector3df(0,5,0));

To these lines:

Code: Select all

    ICameraSceneNode *cam = smgr->addCameraSceneNode(0, vector3df(0,5,-40), vector3df(0,5,0));
    cam->setNearValue(40);
    
    /* If you want to use the handy grid node to check the axis
    ISceneNode *grid = new CGridSceneNode(smgr->getRootSceneNode(), smgr);
    grid->setPosition(vector3df(0, 0, 0));
    grid->setRotation(vector3df(90,0,0));
    */

This is the result I'm seeing. Shouldn't she be cut in half?


But I found if I double the near value to 80, I get the results I thought I should with 40. Am I understanding this right? What's going on here?

FYI Mac OS X, Irrlicht 1.4.1, OpenGL device

[Acki]

hmmm, seems to be a problem with the OGL driver...

with OGL:


and with DX9:

[vitek]

Looks like a bug in both the OpenGL and Burning drivers. It works as expected with the software and Direct3D drivers. I'm guessing it is a problem with the projection matrices.

Travis