Page 168 - DCAP313_LAB_ON_COMPUTER_GRAPHICS

Lab on Computer Graphics

Notes Self Assessment Questions
6. A …………………. is metallic if the highlights and reflections retain the colour of the
reflective object.
7. The basic element of a picture in volume graphics is ………………..

8. A circle, if scaled only in one direction becomes a ………….
9. Reflection of a point about x-axis, followed by a counter-clockwise rotation of 900, is
equivalent to reflection about the line …………

10. A …………….. Reflection is an undisturbed reflection, like a mirror or chrome.
11. Reflection on a shiny surface like wood or tile can add to the photorealistic effects of a
……… rendering.
12. If the axis of rotation is within the body, the body is said to rotate upon itself, or spin.
( a) True (b) False

13. Rotations around the x, y and z axes are called principal rotations.
( a) True (b) False
14. If one does a rotation around a point (axis), followed by another rotation around the same
point (axis), the total result is yet another rotation.
( a) True (b) False

15. A shearing transformation rotates one axis so that the …….. and …….. are no longer
perpendicular.

10.4 Summary

• Rotation of a planar body is the movement when points of the body travel in circular
trajectories around a fixed point called the centre of rotation.
• A Blurry reflection means that tiny random bumps on the surface of the material cause
the reflection to be blurry.
• A polished reflection is an undisturbed reflection, like a mirror or chrome.

• A reflection is metallic if the highlights and reflections retain the colour of the reflective
object.

10.5 Keywords

Blurry: A Blurry Reflection means that tiny random bumps on the surface of the material cause
the reflection to be blurry.
Metallic: A reflection is metallic if the highlights and reflections retain the colour of the reflective
object.
Polished: A Polished Reflection is an undisturbed reflection, like a mirror or chrome.

Rotation: Rotation of a planar body is the movement when points of the body travel in circular
trajectories around a fixed point called the center of rotation.

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