Clipping Techniques in Computer Graphics

What is point clipping in computer graphics?

• Point clipping is the process of determining if a point is inside or outside a defined clipping region.

• Point clipping is the technique of removing points from a graphical scene.

• Point clipping involves scaling a point to fit within a clipping region.

• Point clipping is the process of rendering a point in a different color.

Explain the purpose of line clipping.

• The purpose of line clipping is to add more detail to lines within the viewing area.

• Line clipping is used to enhance color saturation in graphics.

• Line clipping is a technique for creating 3D models from 2D images.

• The purpose of line clipping is to improve rendering efficiency by removing portions of lines that are outside the viewing area.

Name two common algorithms used for line clipping.

• Cohen-Sutherland, Liang-Barsky

• DDA Algorithm

• Bresenham's Line Algorithm

• Midpoint Line Algorithm

What is the Sutherland-Hodgman algorithm used for?

• Image rendering

• Data compression

• Texture mapping

• Polygon clipping

Describe the process of polygon clipping.

• Polygon clipping is only used for 3D shapes.

• Polygon clipping involves defining a clipping area, finding intersection points, and constructing a new polygon for the visible portion.

• The process involves coloring the entire polygon.

• Polygon clipping requires a specific color palette.

How does the Liang-Barsky algorithm work for line clipping?

• The Liang-Barsky algorithm efficiently clips a line segment against a rectangular clipping window using parametric equations and boundary intersection calculations.

• It applies a brute-force method to check each pixel of the line segment.

• The algorithm relies on pixel-based calculations for clipping.

• It uses rasterization techniques to clip lines.

What are the differences between 2D and 3D clipping?

• 2D clipping uses a view frustum, while 3D clipping restricts rendering to a 2D plane.

• 2D clipping restricts rendering to a 2D plane, while 3D clipping considers depth and uses a view frustum.

• 3D clipping only applies to images, while 2D clipping applies to all graphics.

• 2D clipping considers depth, while 3D clipping does not.

What is the role of the clipping window in clipping operations?

• The clipping window is used to apply lighting effects to 3D models.

• The clipping window restricts rendering to a specified area, discarding parts of objects outside this area.

• The clipping window enhances the quality of textures in rendering.

• The clipping window determines the color palette for rendering objects.

Explain the concept of viewport transformation in relation to clipping.

• Viewport transformation maps scene coordinates to the display area, while clipping restricts rendering to the visible portion.

• Viewport transformation only applies to 3D graphics.

• Clipping enlarges the visible area of the scene.

• Viewport transformation is the same as clipping.

Why is clipping important in rendering graphics?

• Clipping is used to add more detail to visible objects.

• Clipping enhances the color quality of rendered objects.

• Clipping reduces rendering workload by excluding non-visible objects.

• Clipping increases the visibility of all objects in the scene.