Computer Graphics Week 2 NPTEL Assignment Answers 2025
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✅ Subject: Computer Graphics
📅 Week: 2
🎯 Session: NPTEL 2025 July-October
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NPTEL Computer Graphics Week 2 Assignment Answers 2025
1. Which among the following is not a subcategory of space partitioning technique?
a. Mesh representation
b. Octrees
c. BSP trees
d. Constructive solid geometry
Answer : For Answers Click Here
2. All other representations are converted to _______ representation at the end of the pipeline before the objects are rendered.
a. mesh
b. BSP tree
c. octree
d. none of the above
Answer :
3. To represent a blobby object a suitable combination of Gaussian density functions is used. The Gaussian density function is characterized by two parameters: height and ______.
a. length
b. standard error
c. standard deviation
d. blobby factor
Answer :
4. Sweep surface and surface of ________ are two sweep representation techniques used in computer graphics.(fill in the blank)
Answer :
5. We can represent a curve using a single parameter ‘u’.
a. True
b. False
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6. Spline refers to _______ of several polynomials.
a. difference
b. joining
c. division
d. multiplication
Answer :
7. Natural cubic spline are made up of pieces of ______ degree polynomial.
a. first
b. second
c. third
d. fourth
Answer :
8. Cubic Bezier curves are examples of approximating splines.
a. True
b. False
Answer :
9. There are two types of continuity conditions: parametric continuity and __ continuity. (fill in the blank)
Answer :
10. Natural cubic splines are examples of interpolating splines
a. True
b. False
Answer : For Answers Click Here
NPTEL Computer Graphics Week 2 Assignment Answers 2024
1. Natural cubic splines do not have local controllability.
a. True
b. False
✅ Answer: a. True
Explanation: Natural cubic splines ensure smoothness globally. Adjusting one control point affects the entire curve, hence they lack local controllability.
2. Hermite cubic spline supports
a. C1 continuity
b. C2 continuity
c. C3 continuity
d. C4 continuity
✅ Answer: a. C1 continuity
Explanation: Hermite splines are designed to match position and first derivatives (tangent) between segments, hence they support C1 continuity.
3. Natural cubic splines are made up of pieces of ___________ degree polynomial.
a. First
b. Second
c. Third
d. Fourth
✅ Answer: c. Third
Explanation: Cubic splines are composed of third-degree polynomials, hence the name.
4. Select the two types of continuity conditions.
a. Geometric continuity
b. Curved continuity
c. Parametric continuity
d. Arithmetic continuity
✅ Answer: a. Geometric continuity, c. Parametric continuity
Explanation: In graphics and modeling, Geometric (G-continuity) and Parametric (C-continuity) are standard types to ensure smooth transitions between curves.
5. Spline refers to ___________________ of several polynomials.
a. Difference
b. Joining
c. Division
d. Multiplication
✅ Answer: b. Joining
Explanation: A spline is a piecewise-defined polynomial function. It involves joining multiple polynomial segments to form a smooth curve.
6. We can represent a curve using a single parameter ‘u’.
a. True
b. False
✅ Answer: a. True
Explanation: Parametric curves like Bézier or B-splines use a single parameter (e.g., ‘u’) to represent curve progression.
7. ________________ can be used to represent blobby object.
a. Distribution function
b. Sphere
c. Light model
d. Pointing model
✅ Answer: a. Distribution function
Explanation: Distribution functions like Gaussian fields are used in metaballs or blobby modeling to represent smooth organic shapes.
8. Mesh is most basic form of representation of any objects of a rendered scene.
a. True
b. False
✅ Answer: a. True
Explanation: Mesh (collection of vertices, edges, faces) is the fundamental structure for representing 3D objects.
9. Bezier cubics
a. Support local controllability
b. Do not support local controllability
✅ Answer: b. Do not support local controllability
Explanation: Bezier curves are affected globally by control points. Changing one point alters the whole curve — hence no local controllability.
10. A cube can be represented as collection of interlinked rectangles. This is an example of
a. Point sample representation
b. Region sample representation
c. Boundary representation
d. Space partitioning
✅ Answer: c. Boundary representation
Explanation: Representing a cube using faces (rectangles) is a form of Boundary Representation (B-Rep) — describing the surface instead of the volume.
