What is visible surface detection method in computer graphics?

It is an image-space method to identify visible surface. This method has a depth information for only single scan-line. ... Also a flag is set for each surface to indicate whether a position along a scan-line is either inside or outside the surface. Pixel positions across each scan-line are processed from left to right.

1. What is visible surface detection method?
2. What is classification of visible surface detection algorithm?
3. How visible surfaces are detected using Z buffer algorithm?
4. What do you mean by hidden surface removal?
5. What is visible surface?
6. What is scanline in computer graphics?
7. How many types of hidden surface algorithm are?
8. Why do we need to remove the hidden surface?
9. What is the importance of hidden line surface removal algorithm?
10. What is Z buffer method in computer graphics?
11. What is Z buffer technique?
12. What is polygon surfaces in computer graphics?
13. What is hidden surface problem in computer graphics?
14. What is hidden surface and hidden removal in computer graphics?
15. What is back face detection?

What is visible surface detection method?

Problem definition of Visible-Surface Detection Methods: To identify those parts of a scene that are visible from a chosen viewing position. Surfaces which are obscured by other opaque surfaces along the line of sighn (projection) are invisible to the viewer.

What is classification of visible surface detection algorithm?

There are two types of visible surface detection algorithm 1) object space method and 2)image space method.

How visible surfaces are detected using Z buffer algorithm?

Therefore, in the Z buffer method, each surface is processed separately one position at a time across the surface. After that the depth values i.e, the z values for a pixel are compared and the closest i.e, (smallest z) surface determines the color to be displayed in frame buffer.

What do you mean by hidden surface removal?

The hidden surface removal is the procedure used to find which surfaces are not visible from a certain view. A hidden surface removal algorithm is a solution to the visibility issue, which was one of the first key issues in the field of three dimensional graphics.

What is visible surface?

What is visible Surface detection? When a picture that contains the non-transparent objects and surfaces are viewed, the objects that are behind the objects that are closer cannot be viewed. ... The hidden surface problems can be solved by two methods − Object-Space method and Image-space method.

What is scanline in computer graphics?

A scan line (also scanline) is one line, or row, in a raster scanning pattern, such as a line of video on a cathode ray tube (CRT) display of a television set or computer monitor. ... This is sometimes used today as a visual effect in computer graphics.

How many types of hidden surface algorithm are?

We have discussed five different hidden surface algorithms: z-buffer, scan line, ray casting, depth sort, and bsp-tree.

Why do we need to remove the hidden surface?

The analogue for line rendering ishidden line removal. Hidden surface determination is necessary to render an image correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible.

What is the importance of hidden line surface removal algorithm?

It is used to locate the visible surface instead of a visible line. Each point is detected for its visibility. If a point is visible, then the pixel is on, otherwise off.

What is Z buffer method in computer graphics?

A depth buffer, also known as a z-buffer, is a type of data buffer used in computer graphics to represent depth information of objects in 3D space from a particular perspective. Depth buffers are an aid to rendering a scene to ensure that the correct polygons properly occlude other polygons.

What is Z buffer technique?

Z-buffering, also known as depth buffering, is a technique in computer graphics programming. It is used to determine whether an object (or part of an object) is visible in a scene. It can be implemented either in hardware or software, and is used to increase rendering efficiency.

What is polygon surfaces in computer graphics?

Polygon is a representation of the surface. It is primitive which is closed in nature. It is formed using a collection of lines. It is also called as many-sided figure. The lines combined to form polygon are called sides or edges.

What is hidden surface problem in computer graphics?

When we view a picture containing non-transparent objects and surfaces, then we cannot see those objects from view which are behind from objects closer to eye. We must remove these hidden surfaces to get a realistic screen image. The identification and removal of these surfaces is called Hidden-surface problem.

What is hidden surface and hidden removal in computer graphics?

In 3D computer graphics, hidden surface determination (also known as hidden surface removal (HSR), occlusion culling (OC) or visible surface determination (VSD)) is the process used to determine which surfaces and parts of surfaces are not visible from a certain viewpoint.

What is back face detection?

Back-Face detection, also known as Plane Equation method, is an object space method in which objects and parts of objects are compared to find out the visible surfaces. ... If this normal vector is pointing away from the center of projection, then it is a back face and can not be seen by the viewer.