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

Answer :-B) Representing objects using a collection of 3D cubes with uniform size The basic idea behind voxels in space partitioning methods is to represent objects in a three-dimensional space using a grid of uniform cubic elements called voxels. Each voxel represents a small portion of the 3D space and can be thought of as the 3D equivalent of a pixel in 2D images. Voxels are used in various applications, such as computer graphics, medical imaging, scientific simulations, and more, to discretize and represent the volumetric data of objects or scenes. This representation allows for efficient storage, processing, and manipulation of 3D data, making it a fundamental concept in various fields.

**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

Answer :-C) Binary Space Partitioning BSP stands for Binary Space Partitioning. It is a technique used in computer graphics and computational geometry to recursively divide a space into two regions using planes. This process creates a hierarchical tree structure where each node represents a partitioning plane, and the leaves of the tree represent convex regions of space. BSP trees are commonly used for various purposes, such as visibility determination, collision detection, and efficient rendering in 3D environments.

**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.

Answer :-For AnswerClick Here

**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)

Answer :-

**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})

Answer :-For AnswerClick Here

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

A) True

B) False

Answer :-

**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

Answer :-For AnswerClick Here

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

B) Left-to-right

Answer :-

**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

Answer :-For AnswerClick Here

**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

Answer :-

**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

Answer :-

**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

Answer :-

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

B) Shading

Answer :-

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

B). False

Answer :-

**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

Answer :-

**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

Answer :-

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

B) Diffuse reflection

Answer :-

**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 |

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