Which is the best hidden surface removal algorithm?
Which is the best hidden surface removal algorithm?
Discussion Forum
| Que. | The best hidden surface removal algorithm is? |
|---|---|
| b. | Area subdivision |
| c. | Depends on the application |
| d. | painters |
| Answer:Depends on the application |
What is hidden surface removal techniques 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 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.
How hidden lines and hidden surfaces are removed?
Hidden Line – when outline of an object is to be displayed – similar to clipping a line segment against a window – most surface algorithms can be applied for hidden line elimination. – lines are created where surfaces meet – if only the visible surfaces are drawn, the invisible lines are automatically eliminated.
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.
How many types of hidden surface algorithms are there?
We have discussed five different hidden surface algorithms: z-buffer, scan line, ray casting, depth sort, and bsp-tree. Two key ideas are applied to help increase the speed of these algorithms: sorting of edges by depth, and pixel coherence for depth and intensity.
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.
Why we require hidden surface removal?
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 types of surface detection methods?
There are two approaches for removing hidden surface problems − Object-Space method and Image-space method….
- All surfaces are outside surfaces with respect to the area.
- Only one inside, overlapping or surrounding surface is in the area.
- A surrounding surface obscures all other surfaces within the area boundaries.
What are different types of visible surface detection?
Visible-Surface Detection Methods. More information about Modelling and Perspective Viewing:
Why we require hidden surface removal algo?
What are the 4 steps of Warnock’s algorithm?
Fig.3.5. Warnock algorithm
- Initialize the region.
- Generate list of polygons by sorting them with their z values.
- Remove polygons which are outside the area.
- Identify relationship of each polygon.
- Execute visibility decision analysis:
- If none of above is correct then subdivide the area and Go to Step 2.
