Cgm Quiz 3D Cse A

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  • 1/10 Questions

    The transformation in which an object can be shifted to any coordinate position in the three-dimensional plane is called  

    • Rotation
    • Translation
    • All of the options
    • Scaling
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About This Quiz

CGM QUIZ 3D CSE A assesses knowledge on 3D transformations, including translation, scaling, and rotation, as well as visibility methods in computer graphics. It is designed for learners to apply theoretical concepts practically, enhancing their understanding of 3D modeling and computer graphics.

Cgm Quiz 3D Cse A - Quiz

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  • 2. 

    The method which is based on the principle of checking the visibility point at each pixel position on the projection plane is called  

    • Object-space method

    • ​​​​​​​Image-space method

    • Both Image & Space

    • None of these

    Correct Answer
    A. ​​​​​​​Image-space method
    Explanation
    The method based on checking the visibility point at each pixel position on the projection plane is called the image-space method. This method involves determining the visibility of objects in the image by analyzing the pixel values and their positions on the projection plane. It focuses on the image itself rather than the objects in the scene or their spatial relationships.

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  • 3. 

    The transformation in which the size of an object can be modified in x-direction ,y-direction and z-direction  

    • Translation

    • Scaling

    • Rotation

    • Shear

    Correct Answer
    A. Scaling
    Explanation
    Scaling is the correct answer because it refers to the transformation that modifies the size of an object in different directions, including the x-direction, y-direction, and z-direction. Scaling can either increase or decrease the size of an object uniformly or non-uniformly, allowing for adjustments in all dimensions. This transformation is commonly used in computer graphics and image processing to resize objects or change their proportions.

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  • 4. 

    Orthographic projection is also known as  

    • Single view projection

    • Two view projection

    • Multi view projection

    • All of the options are correct

    Correct Answer
    A. Multi view projection
    Explanation
    Orthographic projection is a type of projection used in engineering and technical drawing to represent objects in a two-dimensional form. It involves projecting the object onto a plane from multiple views, typically from the front, top, and side. This allows for a more comprehensive and accurate representation of the object, showing all its dimensions and details from different angles. Therefore, the correct answer is "Multi view projection" because it accurately reflects the nature of orthographic projection.

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  • 5. 

    The point, from which the observer is assumed to view the object, is called  

    • Center of projection

    • Point of projection

    • Point of observer

    • View point

    Correct Answer
    A. Center of projection
    Explanation
    The correct answer is Center of projection. This is the point from which the observer is assumed to view the object. It is the point where all the lines of sight converge and determine the perspective of the object.

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  • 6. 

    If the 3-D rotation is applied to an object about x-axis, which plane will refer as plane of rotation

    • X-Y Plane

    • Z-X Plane

    • Y-Z Plane

    • None of the options

    Correct Answer
    A. Y-Z Plane
    Explanation
    When a 3-D rotation is applied to an object about the x-axis, the plane that refers to the plane of rotation is the Y-Z plane. This is because the x-axis is perpendicular to the Y-Z plane, and the rotation occurs within this plane. The X-Y plane and Z-X plane are not the planes of rotation in this case.

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  • 7. 

    The orthographic projection, projection lines are ____ to each other.  

    • Parallel

    • Perpendicular

    • Inclined

    • Any of the options

    Correct Answer
    A. Parallel
    Explanation
    In orthographic projection, the projection lines are parallel to each other. This means that the lines are always equidistant and never intersect or converge. This type of projection is commonly used in engineering and architecture to represent three-dimensional objects on a two-dimensional surface. By using parallel projection lines, accurate and proportional representations of objects can be achieved.

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  • 8. 

    Apply 3-D rotation over a triangle ABC with vertices A(1,1,1), B (1,1,6), C(3,1,0) about z-axis through 90 degrees and calculate the new coordinates of the triangle ABC after rotation.

    • A(-1,1,-1) B(-1,1,6) c(-1,3,0)

    • A(-1,-1,1) B(-1,1,6) c(-1,3,0)

    • A(-1,1,1) B(-1,1,6) c(-1,3,0)

    • A(-1,1,1) B(-1,-1,6) c(-1,3,0)

    Correct Answer
    A. A(-1,1,1) B(-1,1,6) c(-1,3,0)
    Explanation
    The given question asks to apply a 3-D rotation over a triangle ABC with specific vertices. The rotation is about the z-axis through 90 degrees. After performing the rotation, the new coordinates of the triangle ABC are calculated. The correct answer is A(-1,1,1) B(-1,1,6) c(-1,3,0).

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  • 9. 

    Why we need removal of hidden surface  

    • ​​​​​​​for displaying realistic view

    • For determining the closest visible surface

    • Both realistic view and closest visible surface

    • None of these

    Correct Answer
    A. Both realistic view and closest visible surface
    Explanation
    The removal of hidden surfaces is necessary for both displaying a realistic view and determining the closest visible surface. When rendering a scene, objects that are obstructed by other objects should not be visible in order to create a realistic view. Additionally, determining the closest visible surface is important for various applications such as collision detection or determining which object should be interacted with in a virtual environment. Therefore, both reasons contribute to the need for removing hidden surfaces.

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  • 10. 

    If background intensity of a scene is constant with a value 255(white) having two objects, where the first object has a point A(2,2,2) with intensity 128 and the second object has another point B(2,2,4) with intensity 100 overlap each other on 2D plane, the intensity of the location will be 

    • 255

    • 128

    • 100

    • None

    Correct Answer
    A. 128
    Explanation
    The intensity of a location in an image is determined by the intensity values of the objects that overlap at that location. In this case, the first object has a point A with intensity 128 and the second object has a point B with intensity 100. Since the two objects overlap at the location (2,2), the intensity of that location will be the intensity of the object with the higher value, which is 128. Therefore, the correct answer is 128.

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  • Current Version
  • Mar 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 19, 2018
    Quiz Created by
    Lalit
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