## Which algorithm is used for hidden-line removal?

Priority algorithm Imagines that objects are modeled with lines and lines are generated where surfaces join. If only the visible surfaces are created then the invisible lines are automatically removed.

Which visibility test is used in hidden line elimination?

Homogeneity Test • Utilizes neighbourhood points to test its visibility. A Point can be projected onto neighbourhood of projection of points, then the neighbourhood of point P is decided to be visible or invisible.

Which algorithm solves the problem of hidden surface while generating display scan line?

Computer Graphics – Scan Line Algorithm in 3D (Hidden Surface Removal) This algorithm is based on the Image-space method and concept of coherence. As its name suggests itself Scan-line algorithm, so it processes one line at a time rather than processing one pixel(a point on raster display) at a time.

### Why we require hidden surface removal algorithm?

When referring to line rendering it is known as hidden-line removal. Hidden-surface determination is necessary to render a scene 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 are the two main approaches used for hidden surface removal explain briefly the methods used in each approach?

There are two approaches for removing hidden surface problems − Object-Space method and Image-space method. The Object-space method is implemented in physical coordinate system and image-space method is implemented in screen coordinate system.

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 do you mean by hidden surface removal describe any hidden surface removal algorithm?

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 are the two main approaches used for hidden surface removal?

How does Z buffer work?

The Z buffer is a two-dimensional array (X and Y) that stores the Z-value of each screen pixel. If another object must be rendered at the same pixel location, the algorithm overrides the previous value if the new pixel is closer to the camera.

## What do you understand 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 the importance of hidden line and surface removal algorithm?

The primary goal of the hidden line removal is to identify if a limited surface lies between point of view and line or point to be drawn and if point or line part is invisible and is not drawn.