A scene graph is a hierarchical representation of a scene. In its simplest form, it means that objects can be grouped together, and attached to other objects. When one object is "attached" to another, it is said to be a child of the other object, and the other object is its parent. The child node is drawn in its parent's coordinate system - that is, any transformations that affect the parent also affect the child, and the child's own transformation is relative to the parent.
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glPushMatrix()
floorMesh.transform.apply()
floorMesh.draw()
glPushMatrix()
ball.transform.apply()
ball.draw()
glPopMatrix()
glPushMatrix()
pedestal.transform.apply()
pedestal.draw()
glPushMatrix()
teapot.transform.apply()
teapot.draw()
glPopMatrix()
glPopMatrix()
glPopMatrix()
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