What is the process of subdividing the polygonal meshes and free-formed curved surfaces into suitable (and simpler) structures (usually triangles) before rendering?

Which polygon is described by the following?

• The building block of virtual worlds
• The basic primitive for creation of 3D shapes
• The most efficient to represent, process, and visualize with current graphics hardware
• The simplest polygon

What kind of haptic interface (display) is described by the following?

This exerts forces to simulate the texture and other high-spatial-frequency details of virtual objects. Its examples are single-point force-feedback devices (e.g., PHANTOM), exoskeletons, and haptic surfaces.

What kind of haptic interface (display) is described by the following?

This display creates touch sensations by passing a small electric current through the skin. It has no moving parts. But its users may feel pain instead of a simple signal detection.

What kind of touch sense is about the tactile sense on the skin? (Choose the best answer.)

Which coordinate system is described by the following?

• The position of a point is specified using one distance (ρ from the origin) and two angles (θ and φ) measured from the reference planes at right angles.
• Commonly used to define positions relative to the surface of the Earth (e.g., meteorology, geography, and oceanography: two angles are latitude and longitude).
• Used in astronomy to specify the position of celestial objects.

Which of the human senses has strong correlations with attention, reaction times, mood, and emotional state?

Which is NOT one of the typical 3D interaction tasks?

What is described by the following?

• The cognitive component of navigation
• The common everyday activity of selecting the destination and finding the path by which to travel from the current location to the desired new location.

Which is NOT about the virtual ray-casting method in selecting objects in 3D space?