NPTEL Computer Graphics Assignment Solutions

## NPTEL Computer Graphics Week 3 Assignment Answers 2023

**1. What is the basic idea behind voxels in space partitioning methods?**A) Representing objects using a collection of 2D pixels

B) Representing objects using a collection of 3D cubes with uniform size

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**2. What does BSP stand for in space partitioning methods?**A) Binary Subdivision Procedure

B) Boundary Space Partitioning

C) Binary Space Partitioning

D) Base Structure Placement

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**3. What does CSG stand for, and how does it represent objects in space?**

A) Constructive Shape Graphics – It uses polygonal representation for objects.

B) Constructive Solid Geometry – It relies on joining spaces using Boolean operators to represent objects.

C) Composite Scene Generation – It represents objects using point clouds.

D) Comprehensive Space Grids – It divides objects using octrees for representation.

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**4. Which of the following operations is NOT a basic transformation in modeling transformations?**A) Translation (T)

B) Rotation (R)

C) Scaling (S)

D) Shearing (Sh)

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**5. What is the mathematical representation of scaling for a point (x, y)?**

A) (x+s_{x}, y+s_{y})

B) (x∗s_{x}, y∗s_{y})

C) (s_{x}∗x, s_{y}∗y)

D) (x/s_{x}, y/s_{y})

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**6. Modeling transformations transform objects from local/object coordinates to world coordinate system**

A) True

B) False

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**7. What is the general approach to apply multiple basic transformations with respect to an arbitrary fixed point?**A) Scale, Translate, Scale back

B) Translate to origin, Perform transformation, Translate back to original position

C) Rotate, Scale, Shear

D) Translate, Rotate, Scale

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**8. In which sequence should multiple geometric transformations be applied to get the correct result?**A) Right-to-left

B) Left-to-right

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**9. What is the purpose of the composite matrix in 3D transformations?**

A) To perform multiple shearing transformations on an object

B) To combine translation, rotation, and scaling transformations into a single matrix

C) To convert 3D points to 2D points

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**10. In space partitioning, large memory is required to store voxel-grid information**A) True

B) False

**Answer :- **

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## NPTEL Computer Graphics Week 4 Assignment Answers 2023

**1. What is the process of computing the luminous intensity at a point known as?**A) Illumination

B) Lighting

C) Direct coloring

D) Indirect coloring

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**2. In graphics there are typically three types of light sources: Point light source, Directional source and ______ source.**A) Spotlight

B) Ambient

C) Simple

D) Albedo

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**4. Reflection from a point can occur either of two ways: Diffuse reflection and _ ___.**

**A) Direct reflection**

B) Specular reflection

C) Indirect reflection

D) Ambient reflection

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**4. _______ models work at the pixel-level, after the scene is mapped to the screen.**A) Lighting

B) Shading

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**5. In the simple lighting model, we assume presence of a single ambient light source fully illuminating all the surfaces.**A) True

B). False

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**6. Color of a surface point depends on the properties of the light source as well as the surface containing the point.**A) True

B). False

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**7. In lighting model, to avoid indistinguishable overlapping of surfaces with different distances we use**A) Intensity Attenuation

B) Color Attenuation

C) Intensity Reflection

D) Color Reflection

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**8. Incident light tends to reflect in all directions from a rough or grainy surface. This is called**A) Specular reflection

B) Diffuse reflection

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**9. Gouraud shading limitations can be overcome with a more accurate shading model, known as the ______.**

A) Phong shading

B) Flat shading

C) Iterative shading

**Answer :- **

**10. ____ __ attenuation factor accounts for the effect of diminishing light intensity over distance.**

**A) Angular**

B) Radial

**Answer :- **

Course Name | Computer Graphics |

Category | NPTEL Assignment Answer |

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