112 lines
4.7 KiB
HTML
112 lines
4.7 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 MODEL LIGHTS</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 MODEL LIGHTS</P></h1></font>
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</center>
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<blockquote><p><i>Yes, that's right, we finally have model lights on MD2s. Thanks to Henrik's fixing of
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lw2md2, you can model light entities that have been redelivered with the new tool (or CTCs) </p></i></blockquote>
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<h2><P>Creating Lights</P></h2>
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<blockquote>
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<h3><p>Creating Point Lights</h3></p>
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<p>To make point lights, you must make an entity with the classname "modellight". Then, set the key, "lighting" to be the radius of the light.
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This is the distance from the source that the light will affect entities. Set the R, G, and B keys to be the color of the light.</p>
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<p><h3>Creating a World Ambient Light</h3></p>
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<p>You can also have a default light source which will affect all entities that aren't in the range of one of the light entities. This is
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the world ambient light source. To set this, you set the angles of the worldspawn for the direction and the R,G,B values for the color. This
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is an infinite parallel light source which will affect all relevant entities.</p>
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</blockquote>
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<p><h2>Flagging an Entity as Lit</h2></p>
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<blockquote>
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<p>By default, all entities are not directionally lit. That is, if the lighting field in the entity.dat is 0, it won't be affected by
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these model lights. To change this, change the field to either 1 or 2. If 1 is selected, only model lights will affect the entity (including the world ambient).
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If it is set to 2, the normal lighting scheme will be mixed with the directional light so it's effectively combining both the standard Quake2 lighting model with
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the model lights</p>
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</blockquote>
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<p><h2>Controlling Ambient Lights</h2></p>
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<blockquote><p>
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You can modify the direction and color of the dynamic light through a series of APE and Planet commands. This is useful for when you move to
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significantly different areas where the lighting needs to be drastically different (such as going from inside to outside, etc.)</p>
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</blockquote>
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<blockquote>
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<p><h3>In APE</h3></p>
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<p>Change the color with the following command:</p>
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<font = "courier"><i>
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LIGHT_SetAmbientColor [r] [g] [b]
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</font></i>
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<p>
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Where R, G, and B are the Red, Green, and Blue components of the ambient light color
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</p>
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<p>Change the direction with the following command:</p>
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<font = "courier"><i>
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LIGHT_SetAmbientDir [yaw] [pitch] [roll]
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</font></i>
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<p>
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Where, yaw pitch and roll are the angles of the light direction vector.
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</p>
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<p><h3>In Planet</h3></p>
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<p>Change the color with the following command:</p>
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<font = "courier"><p><i>
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setambientcolor [r] [g] [b]
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</p></font></i>
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<p>Where r, g, and b are the red, green, and blue components of the color.</p>
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<font = "courier"><p><i>
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setambientdir [yaw] [pitch] [roll]
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</p></font></i>
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<p>Where yaw, pitch, and roll are the angles of the light direction vector.</p>
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</blockquote>
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<p><h2>Special Effects and Other Features</h2></p>
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<blockquote>
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<p>Because the lights are entities, and use the RGB fields to determine their color, you can do a color lerp on the entity to change the color of the light itself.</p>
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<p>The lights can also be triggered, much like the particles to be off or on. By setting the light_disable key in noxdrop, the light will be spanwed as off.
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When it is triggered, the light will activate. By default, the lights are on until that key is set. If they are on, the triggering will turn
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the light off </p>
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</blockquote>
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<p><h2>Performance Considerations</h2></p>
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<blockquote>
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<p>Only flag essential entities as lit. Lighting is computationally expensive. Only entities that you feel need to be lit should be marked as such in the entity.dat.</p>
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<p>Keep the lights to a minimum. Only the single closest light is applied to the model. It's not that hard to change it to multiple light sources, but we
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also incur a major performance hit (essentially doubles the work for 2 lights, etc.). For now, I'm keeping it at a single source--either ambient or a light entity.</p>
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<p>Right now I have it capped at 4 lights per PVS. I'm going to add a light # in the performance meter so you can gague your progress. Also, 4 lights is
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a tad oppressive, so I may max it to 16, but please, keep these lights to a minimum</p>
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</blockquote>
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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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</HTML>
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