Irrlicht Engine

But if I call the video 3d drawing functions will it use the camera scene node? I'm really confused. I've tryed this:

int main()
{
video::E_DRIVER_TYPE driverType=video::EDT_OPENGL;
IrrlichtDevice *device = createDevice(driverType,
core::dimension2d<u32>(512, 384));
if (device == 0) return 1 ...

How do you set the current projection matrix? I swear I've read the whole documentation and didn't find the answer.

1. First you add nodes to the Scene Manager. Each node contains one or more meshes. Then you add a CameraSceneNode to the scene manager and configure it. Then you call the function drawAll() of your scenemanager objects and everything is drawn to the video buffer based on that CameraSceneNode. Is ...

I've spent hours trying to do a simple program that draws a 3d cube (1,1,0,2,2,1) from a camera at pos (0,0,0) facing towards (1,0,0) in a LH coordinate system where Z faces upwards, without using the scene manager, but I can't figure out how to do it. My last attempt:

core::matrix4 mat = core ...

True. Can you tell me or link me to an explanation about indices?

But can that be converted to a IMesh object?

For instance:
IMesh * createMesh(v3d(0,0,0),v3d(1,0,0),v3d(0,1,0),v3d(1,0,0));

To create a simple pyramid. What's the right code for it?
Thanks in advance.