Page 134 - DCAP504_Computer Graphics

Unit 8: 3-D in Computer Graphics

8.6 Self Assessment

1. State whether the following statements are true or false:
(a) 3-D is represented with the aid of digital computers and 3-D software.
(b) Scene layout is the arrangement of virtual objects, cameras, lights and other units.
(c) A set of control points define the quadratic surface.
(d) The vector is a directed line segment from view plane to view normal point.
(e) An orthographic projection is a parallel projection if the projection lines are all normal to the
projection plane.
(f) The perspective transformation changes graphics pipeline into the canonical cube.
2. Fill in the blanks:
(a) Splines are represented mathematically with a …………………. polynomial function.
(b) A ………………… is a film plane in a camera that is positioned for a particular shot of the
scene.
(c) Clipping is the process of removing objects that are not…………………. from the scene.
(d) A composite transformation matrix is the product of …………………. matrices.
(e) …………………. are implemented to convert 3-D objects into 2-D projection planes.
3. Select the suitable choice for every question:
(a) Surface in simple words is a family of:
(i) Curves

(ii) Lines
(iii) Squares
(iv) Spheres
(b) The Bezier surface does not pass through the control points that are positioned:
(i) Beside the surface
(ii) Behind the surface

(iii) Front the surface
(iv) In between surface
(c) Which process helps in reducing the computational effort?
(i) Clipping
(ii) Transforming
(iii) Rendering
(iv) Rotating

(d) Which of the following representations are common in design and solid modeling
applications?
(i) Polygon tables
(ii) Polygon rendering
(iii) Polygon mesh

(iv) Polygon mapping

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