Irrlicht Engine

I want to make a scene in 3d that show various models which have some text floating over them. And no matter how user rotate the camera, the text will be readable.

I see from 2DGraphics tutorial of how to write text in 2d plane, but is it
possible to write it in 3d plane ?

Or I have to load and show text as a sprite ?

You're looking for a Billboard Scene Node. Take a look at the Collision tutorial (it's your pointer on the screen), and look at the documentation.

More likely the ITextSceneNode.

Thanks, I take a look a both suggestions and ITextSceneNode works fine for me.