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James Gregory 2013-12-30 15:11:04 +11:00
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<meta name="vspubdate" content="07/01/97" />
<meta name="vscategory" content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development" />
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Bit-Plane Animation</title><!-- HEADER -->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Bit-Plane Animation</title>
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<p>The addition of code to support rotated images would also open the door to support for internal animation, where the appearance of a given image changes over time to suggest that the image is an active entity. For example, propellers could whirl, jaws could snap, and jets could flare. Bit-plane animation with bit-aligned images and internal animation can look truly spectacular. It&rsquo;s a sight worth seeing, particularly for those who doubt the PC&rsquo;s worth when it comes to animation.</p>
<h3><a id="Heading6"></a>Limitations of Bit-Plane Animation</h3>
<h3 id="Heading6">Limitations of Bit-Plane Animation</h3>
<p>As I&rsquo;ve said, bit-plane animation is not perfect. For starters, bit-plane animation can only be used in the VGA&rsquo;s planar modes, modes 0DH, 0EH, 10H, and 12H. Also, the reprogramming of the palette registers that provides image precedence also reduces the available color set from the normal 16 colors to just 5 (one color per plane plus the background color). Worse still, each image must consist entirely of only one of the four colors. Mixing colors within an image is not allowed, since the bits for each image are limited to a single plane and can therefore select only one color. Finally, all images of the same precedence must be the same color.</p>
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Graphics Programming Black Book &copy; 2001 Michael Abrash
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