forked from Mirrors/openclonk
50 lines
1.8 KiB
XML
50 lines
1.8 KiB
XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<!DOCTYPE doc
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SYSTEM '../../clonk.dtd'>
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<?xml-stylesheet type="text/xsl" href="../../clonk.xsl"?>
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<doc>
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<title>CNAT - Contact Attachment</title>
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<h>CNAT - Contact Attachment</h>
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<text>In multiple places the engine uses ContactAttachment values (a bitmask) to manage the orientation of objects and processes. For example, a vertex of an object can have the <code id="CNAT">CNAT</code> bit <em>left</em>. If that object has <emlink href="definition/defcore.html">ContactCalls</emlink> activated, the engine calls on every contact of that vertex with the landscape the object script function <em>ContactLeft</em>. CNAT values are composed of the following bits:</text>
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<text>
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<table>
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<rowh>
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<col>CNAT</col>
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<col>Description</col>
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</rowh>
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<row>
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<col>CNAT_Left</col>
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<col>Direction: Left</col>
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</row>
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<row>
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<col>CNAT_Right</col>
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<col>Direction: Right</col>
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</row>
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<row>
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<col>CNAT_Top</col>
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<col>Direction: Up</col>
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</row>
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<row>
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<col>CNAT_Bottom</col>
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<col>Direction: Down</col>
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</row>
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<row>
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<col>CNAT_Center</col>
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<col>Direction: Center (not for attachment)</col>
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</row>
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<row>
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<col>CNAT_MultiAttach</col>
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<col>Special flag: new attachment behaviour for objects with the same direction value at several vertices.</col>
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</row>
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<row>
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<col>CNAT_NoCollision</col>
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<col>Extra flag: non-colliding vertex</col>
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</row>
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<bitmask>CNAT</bitmask>
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</table>
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</text>
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<text>A vertex can have multiple CNAT values, they can be combined them with the | operator. Example:</text>
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<code>Attach = CNAT_Bottom | CNAT_Left</code>
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<author>Newton</author><date>2013-11</date>
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</doc>
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