57 lines
2.9 KiB
HTML
57 lines
2.9 KiB
HTML
<HTML>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
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<META NAME="Generator" CONTENT="Microsoft Word 97">
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<TITLE>HOW TO USE FOG BRUSHES</TITLE>
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</HEAD>
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<BODY TEXT="#FFFFFFFF" LINK="#0000ff" VLINK="#800080" BGCOLOR="#000000">
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<FONT FACE="Tahoma">
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<center>
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<p><h1><font color="#FFFF00">HOW TO USE FOG BRUSHES</P></h1></font>
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</center>
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<blockquote><p><i>Yes, that's right, you now have fog brushes in Anachronox. But, they're not as
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easy to use or as flexible as Daikatanas. Still, they are somewhat neat and can be
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used for a few different things</p></i></blockquote>
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<h2><P>Creating a Fog Brush</P></h2>
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<p>Fog brushes are bmodels of the classname func_fog. So make a bmodel of any shape with the
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classname "func_fog". Then you have to flag the surface with the 40000000 flag.
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Then, you must set values in the key,value pairs to change the fog properties.</p>
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<p><h3>Fog Attributes</h3></p>
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<p>To set the color of the fog, you set the R, G, and B keys like you would any entity.</p>
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<p>By default, the brush makes a gradient from full opacity to clear--you can make it fainter by using the key
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"lighting" and setting it to any 2 digit number. For instance, if you set the lighting key to 50,
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it will subtract 50 percent from the alpha value making it half as opaque.</p>
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<p>To change the direction of the fog gradient, set the first character of the "message" field to any number between 0 and 5. The
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default is a graident from the bottom to the top of the brush. By setting it to 1 you can have it reverse
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that. The numbers 2-5 do horizontal fades. By setting the field to 6, there will be no gradient.</p>
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<p>To pulsate the fog (as in labbuilding), in the message field, use second character as a number from 0-9 representing the fade speed.
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The higher the number, the slower it fades. The rest of the string is the alpha value the fog will stop fading at, so you can cap
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the throb off at .50 alpha etc.</p>
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<p>By default the alpha blend is using additive blending. By setting the lightstyle key to 1, you
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can turn off the additive blend.</p>
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<p><h3>Examples and Usage</h3></p>
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<p>You can see a simple example of a fogbrush in the level funcfog. Also, if you look at funcfog4 you can see one application of
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the fog brush to create the illusion of glowing lava. Of course, this involves the laborious task of making a
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bunch of brushes that fit the hole you want to line with fog.</p>
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<p>Eventually I'd like to get Daikatana/Quake3 style fog that fits the contour of any brush that intersects
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a fog brush (you just make a box around all the polys you want to be coated wth fog). That's a little ways off,
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but until then I think you can come up with some neat ways to use this.</p>
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<hr>
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<p>Complain about this document to the wonderful author, <A HREF="mailto:ralph@ionstorm.com">Ralph Barbagallo</a></p>
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