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Rasterization Techniques

Description: This quiz covers various rasterization techniques used in computer graphics to convert vector graphics into pixel-based images.
Number of Questions: 14
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Tags: rasterization computer graphics image rendering
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Which rasterization technique is commonly used for rendering polygons with smooth edges?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: D
Explanation:

Phong Shading is a shading technique that interpolates pixel colors across a polygon's surface to create smooth edges.

What is the purpose of the z-buffer in rasterization?

  1. To determine the visibility of pixels

  2. To store the depth values of pixels

  3. To calculate the color of pixels

  4. To apply textures to pixels


Correct Option: B
Explanation:

The z-buffer stores the depth values of pixels, which is used to determine the visibility of pixels and perform depth sorting.

Which rasterization technique is used to render lines and curves?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: B
Explanation:

Bresenham's Algorithm is commonly used to rasterize lines and curves by incrementally calculating pixel positions along the desired path.

What is the primary goal of anti-aliasing in rasterization?

  1. To reduce pixelation

  2. To improve color accuracy

  3. To increase rendering speed

  4. To apply textures to pixels


Correct Option: A
Explanation:

Anti-aliasing aims to reduce pixelation and jagged edges by blending the colors of adjacent pixels, resulting in smoother lines and curves.

Which rasterization technique is commonly used for rendering triangles?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: A
Explanation:

The Scanline Algorithm is widely used for rasterizing triangles by processing pixels along each scanline that intersects the triangle.

What is the purpose of the framebuffer in rasterization?

  1. To store the final image

  2. To store the depth values of pixels

  3. To calculate the color of pixels

  4. To apply textures to pixels


Correct Option: A
Explanation:

The framebuffer stores the final image, which is the collection of pixel colors that represent the rendered scene.

Which rasterization technique is used to render circles and ellipses?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: C
Explanation:

The Midpoint Algorithm is commonly used to rasterize circles and ellipses by calculating the midpoint of each octant and determining which pixels to fill.

What is the process of converting a 3D scene into a 2D image called?

  1. Rasterization

  2. Tessellation

  3. Shading

  4. Texturing


Correct Option: A
Explanation:

Rasterization is the process of converting a 3D scene into a 2D image by discretizing the scene into pixels and determining the color of each pixel.

Which rasterization technique is commonly used for rendering complex scenes with many objects?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Z-Buffering


Correct Option: D
Explanation:

Z-Buffering is commonly used for rendering complex scenes with many objects by maintaining a depth buffer to determine the visibility of pixels and perform depth sorting.

What is the purpose of texture mapping in rasterization?

  1. To add color to pixels

  2. To apply patterns to pixels

  3. To simulate surface textures

  4. To increase rendering speed


Correct Option: C
Explanation:

Texture mapping is used to simulate surface textures by applying a texture image to the surface of a 3D object, allowing for realistic visual effects.

Which rasterization technique is commonly used for rendering curved surfaces?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: D
Explanation:

Phong Shading is commonly used for rendering curved surfaces by interpolating pixel colors across the surface to create smooth shading and highlights.

What is the purpose of dithering in rasterization?

  1. To reduce color banding

  2. To improve color accuracy

  3. To increase rendering speed

  4. To apply textures to pixels


Correct Option: A
Explanation:

Dithering is used to reduce color banding, which is the appearance of distinct bands of color in an image, by distributing colors in a way that creates the illusion of a smooth gradient.

Which rasterization technique is commonly used for rendering shadows and highlights?

  1. Scanline Algorithm

  2. Bresenham's Algorithm

  3. Midpoint Algorithm

  4. Phong Shading


Correct Option: D
Explanation:

Phong Shading is commonly used for rendering shadows and highlights by calculating the intensity of light at each pixel based on the surface orientation and light source position.

What is the purpose of supersampling in rasterization?

  1. To reduce aliasing

  2. To improve color accuracy

  3. To increase rendering speed

  4. To apply textures to pixels


Correct Option: A
Explanation:

Supersampling is used to reduce aliasing, which is the appearance of jagged edges in an image, by rendering the image at a higher resolution and then downsampling it to the desired resolution.

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