Bitmap Filter Types

Specifies the type of filtering to perform. More...

Defines
#define	BMM_FILTER_NONE   0
	Specifies no filtering should be performed.
#define	BMM_FILTER_DUMMY   1
	No longer used.
#define	BMM_FILTER_SUM   2
	Specifies summed area filtering.
#define	BMM_FILTER_PYRAMID   3
	Specifies pyramidal filtering.

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Detailed Description

Specifies the type of filtering to perform.

The Pyramidal and Summed Area options provide two methods of pixel averaging that antialias the bitmaps in mapped materials.

Both methods require approximately the same rendering time. Summed-area filtering generally yields superior results but requires much more memory. Pyramidal filtering requires the program to allocate memory equal to approximately 133% of the size of the bitmap. By comparison, summed-area filtering requires the program to allocate approximately 400% of the size of the bitmap.

Use summed-area filtering only for smaller bitmaps, and avoid using any more such bitmaps in a scene than necessary.

Pyramidal filtering is quite adequate for most purposes. However, because it applies filtering as a function of distance, irregular antialiasing may occur on detailed texture maps that are applied to a plane receding into the distance. The effect of pyramidal filtering on extreme perspectives such as this is even more noticeable in animations, where portions of the texture map appear to "swim."

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Define Documentation

#define BMM_FILTER_NONE   0

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Specifies no filtering should be performed.

#define BMM_FILTER_DUMMY   1

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No longer used.

#define BMM_FILTER_SUM   2

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Specifies summed area filtering.

#define BMM_FILTER_PYRAMID   3

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Specifies pyramidal filtering.