camera,view matrix,scnen graph

Hi,i known about there is a camera object in some enginee and it has own poisition and orientation,and it can be attached to a node of scene graph which can has own position and orientation as well,so if i attach my camera to a node,so how do i determine the camera position and orientation,and in order to calculate the view matrix!Sorry,i don’t know if this is right place to ask this sort of question!

Well, scene graphs can be used different ways, but a common usage is that the root node of the scene graph is in WORLD SPACE.

Attaching a camera to a node in the scene graph would typically mark the coordinate frame under that node EYE SPACE.

So to get your VIEWING transform (WORLD-to-EYE transform), you’d merely concatenate the transforms from the scene graph root down to your camera node.