Processing each small raster requires array of only 2500 elements, but execution time grows because each polygon is processed many times.

For example, the original 500 x 500 faster can be divided into 100 rasters each 50 x 50 pixels.

To reduce the amount of storage required, the image can be divided into many smaller images, and the depth buffer algorithm is applied to each in turn.

Even though the frame buffer may provide memory for intensity array, the depth array remains large.

Generating an image with a raster of 500 x 500 pixels requires 2, 50,000 storage locations for each array.

The depth buffer Algorithm is not always practical because of the enormous size of depth and intensity arrays.

Before step 1, all polygons in the scene are transformed into a screen coordinate system using matrix multiplication. The IInd important feature of the algorithm is its use of a screen coordinate system. These polygons may be faces of polyhedral recorded in the model of scene or may simply represent thin opaque 'sheets' in the scene.ħ. First, it requires a representation of all opaque surface in scene polygon in this case.Ħ. The depth buffer algorithm illustrates several features common to all hidden surface algorithms.ĥ.

After all, polygons have been processed the intensity array will contain the solution.Ĥ. (b) If z depth, the polygon already recorded at (x, y) lies closer to the observer than does this new polygon, and no action is taken.ģ. (a) Calculate the depth z of the polygon at (x, y) Algorithmįor all pixels on the screen, set depth to 1.0 and intensity to a background value.įor each polygon in the scene, find all pixels (x, y) that lie within the boundaries of a polygon when projected onto the screen.

Depth buffer algorithm requires 2 arrays, intensity and depth each of which is indexed by pixel coordinates (x, y). Depth buffer is an extension of the frame buffer. In addition to depth, we also record the intensity that should be displayed to show the object. For each pixel on the display screen, we keep a record of the depth of an object within the pixel that lies closest to the observer. Depth buffer algorithm is simplest image space algorithm.

It is also called a Depth Buffer Algorithm.

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