Which algorithm is better for hidden surface removal?
z-buffer algorithm
The z-buffer algorithm is the most widely used method to solve the hidden surface problem. It has the following main advantages over other hidden surface removal algorithms: No sorting required. Models can be rendered in any order.
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What is the role of hidden surface removal method in computer graphics?
One of the most challenging problems in computer graphics is the removal of hidden parts from images of solid objects. To remove these parts and create a more realistic image, we need to apply a hidden line or hidden surface algorithm to the set of objects. …
What do you mean by removing hidden surfaces? Describe any hidden surface removal algorithms?
In 3D computer graphics, hidden surface determination (also known as hidden surface removal (HSR), occlusion selection (OC), or visible surface determination (VSD)) is the process used to determine which surfaces and parts of surfaces they are not visible from a certain point of view.
How are hidden lines and hidden surfaces removed?
Hidden Line Removal: Assumes that objects are modeled with lines. – lines are created where surfaces meet – if only visible surfaces are drawn, invisible lines are automatically removed. ABCD, DCEF, ADFG are visible. Therefore, all lines are visible, ie AB, DC, FE, AG, …, BC, CE, GF.
Is it necessary to remove the hidden surface? Why?
When referring to the rendering of lines, it is known as hidden line removal. Determining the hidden surface is necessary to render a scene correctly, so that one cannot see hidden features behind the model itself, allowing only the naturally visible part of the graphic to be visible.
How does the z-buffer algorithm determine which surfaces are hidden?
The Z buffer, also known as the depth buffer method, is one of the commonly used methods for hidden surface detection. It is an image space method. Image space methods are based on the pixel to be drawn in 2D. For these methods, the runtime complexity is the number of pixels multiplied by the number of objects.
What are the two main approaches used for hidden surface removal?
There are two approaches to eliminate hidden surface problems: the object space method and the image space method. The object space method is implemented in the physical coordinate system and the image space method is implemented in the screen coordinate system.
What is the hidden surface problem?
When we view an image that contains non-transparent objects and surfaces, we cannot see the objects that are behind the objects closest to the eye. The identification and elimination of these surfaces is called the hidden surface problem.
Why do we need hidden surface removal?
What is hidden solids removal?
The hidden solid removal problem involves viewing solid models with hidden lines or surfaces removed. The available hidden line algorithm and hidden surface algorithms can be used for hidden solid removal of B-rep models.
How does the Z-buffer algorithm determine which surfaces are hidden?
What happens when two polygons have the same Z value and the z-buffer algorithm is used?
Example 3: What happens when two polygons have the same z-value and the z-buffer algorithm is used? Solution: z-buffer algorithms, change color by one pixel if z(x,y).
How is the elimination of hidden surfaces in computer graphics?
Removing Hidden Surfaces One of the most challenging problems in computer graphics is the removal of hidden parts from images of solid objects. In real life, the opaque material of these objects obstructs the light rays from the hidden parts and prevents us from seeing them.
How are the different hidden surface removal algorithms used?
Different classification algorithms are applied to different hidden surface algorithms. The classification of the objects is done using the coordinates x and y, z. Mostly the z coordinate is used for sorting. The efficiency of the classification algorithm affects the hidden surface removal algorithm.
How is the z-coordinate used in hidden surface removal?
Mostly the z coordinate is used for sorting. The efficiency of the classification algorithm affects the hidden surface removal algorithm. To classify complex scenes or hundreds of polygons, complex classifications are used, i.e. quick classification, tree classification, base classification.
What is correct correct visibility or hidden surface removal?
Visibility (remove hidden surfaces) n Correct rendering requires correct visibility calculations n Correct visibility: when multiple opaque polygons cover the same screen space, only the closest one is visible (remove the other hidden surfaces) incorrect visibility Correct visibility Visibility ( removal of hidden surfaces)