3D Graphics and Virtual Reality
Section A.
Briefly explain the main differences between the following three forms of virtual reality: Immersive; Windowonworld; and Augmented Reality.
( 3 marks )
Briefly explain what is meant by the terms "visual realism" and "latency" when describing a VR system. Also explain how these two terms are related.
( 3 marks )
Describe two realworld applications of virtual reality technology, one which demands high visual realism and one which demands low latency, explaining why in each case.
( 4 marks )
Section B.


Scaling by S_{x} and S_{y} 
Translation by t_{x} and t_{y} 
Shown above are two 2D transformations. One shows a scaling operation and the other a translation operation. The scaling operation produces a scaling effect which is centred about the origin. Describe how you can use compound transformations to produce a single transformation (S_{P}) which will scale about any given point.
( 3 marks )
By multiplying together the matrices in this new compound transformation (S_{P}), derive a single transformation matrix which will scale by factor (Sx, Sy) centred on the point (Px, Py).
( 3 marks )
Apply your new transformation to the object shown in the figure below. Scale the object by a factor of (1.5, 0.5) centred around the point (2, 1) and sketch the resulting position and shape of the object  clearly marking the coordinates of each vertex.
( 4 marks )