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<span class="anchor" id="line-1"></span><p class="line862">The <a href="/quake4/FXEditor_Tab_-_Origin">Origin</a> tab can control more than the bounds in which <a href="/quake4/FXEditor_Tab_-_Sprite">sprites</a> and <a href="/quake4/FXEditor_Tab_-_Sprite">lines</a> spawn. <span class="anchor" id="line-2"></span><span class="anchor" id="line-3"></span><pre>Example: An effect was needed where sprites moved outward from a center point. You could set values under Motion for Left and Up, but this would create a square shape when viewed from the top.
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<span class="anchor" id="line-4"></span></pre><span class="anchor" id="line-5"></span><span class="anchor" id="line-6"></span><p class="line862">To get around this, apply <a href="/quake4/FXEditor_Tab_-_Motion">motion</a> only in the forward axis and use <a href="/quake4/FXEditor_Tab_-_Origin">Origin</a> to adjust where the forward axis is. This can be accomplished by <a href="/quake4/FXEditor_Tab_-_Origin#normalfromcenterorsurface">Generating the normal from effect origin</a> of an effect segment and selecting <a href="/quake4/FXEditor_Tab_-_Origin#spawnonsurface">Spawn on Surface</a> of a shape such as a <a href="/quake4/FXEditor_Tab_-_Origin#cylinder">cylinder</a> or <a href="/quake4/FXEditor_Tab_-_Origin#sphere">sphere</a>. Depending on the size of the origin min/max bounds, the sprite particles will emit from what appears to be a bubble or from a point. If the origin bounds are very small, it will appear as though the sprites are emitting from a single point. <span class="anchor" id="line-7"></span><span class="anchor" id="line-8"></span><p class="line862">This same technique can be used with <a href="/quake4/FXEditor_Tab_-_Sprite">lines</a>, and will give them a direction to point in. A good example is <strong>effects/weapons/machinegun/impact_default.fx</strong>. The <strong>side_streaks</strong> segment uses a <a href="/quake4/FXEditor_Tab_-_Origin#cylinder">cylinder</a> origin with <a href="/quake4/FXEditor_Tab_-_Origin#spawnonsurface">Spawn on Surface</a> checked. Giving the <a href="/quake4/FXEditor_Tab_-_Origin">Origin</a> only a min value for in the forward axis ensures a consistent angle forward, while a range of left and up values ensure a random selection around the circumference of the <a href="/quake4/FXEditor_Tab_-_Origin#cylinder">cylinder</a>. As the forward value grows larger in relation to the left and up values, the angle of the line segments grows steeper. As the forward value grows smaller in relation to the left and up values, the angle of the line segments grows shallower. (Note on the machinegun effect: Since the forward origin value is –0.2, Invert Normals is checked so the lines point the proper direction.) <span class="anchor" id="line-9"></span><span class="anchor" id="line-10"></span><p class="line874">A good way to achieve the angle you are looking for is to make sure your particle count is high temporarily so it’s easier to see what is going on. Remember that once you find your angle, you can adjust the numbers down to decimal values so that the angle is projected from a single point. <span class="anchor" id="line-11"></span><span class="anchor" id="line-12"></span><pre>Example: Forward value of 5, Left and Up min/max values of –10/10. This will generate a cylinder 5 units tall with a diameter of 10 units. If you wish this effect to emit from a point, drop the values to: Forward 0.05 and Left/Up min/max –0.1/0.1
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<span class="anchor" id="line-13"></span></pre><span class="anchor" id="line-14"></span><span class="anchor" id="line-15"></span><p class="line867">
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<h2 id="head-6906adeaf419d98ddaadff8634dad32f5b598a54">Sample Origin values and visual description.</h2>
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<span class="anchor" id="line-16"></span><p class="line867"><hr /><p class="line874"> <span class="anchor" id="line-17"></span>
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<h3 id="head-1d8433347ba29f521f41026b596d0c28cf978de4">Example A:</h3>
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<span class="anchor" id="line-18"></span><div><table style="width: 25%"><tbody><tr> <td><p class="line862">Forward min</td>
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<td><p class="line891"><strong>5</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-19"></span><p class="line862">Left min/max</td>
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<td><p class="line891"><strong>-10/10</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-20"></span><p class="line862">Up min/max</td>
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<td><p class="line891"><strong>-10/10</strong></td>
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</tr>
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</tbody></table></div><span class="anchor" id="line-21"></span><span class="anchor" id="line-22"></span><p class="line867">
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<h3 id="head-def183bf27888230da265d08338568c7a7f020a5">Example B:</h3>
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<span class="anchor" id="line-23"></span><div><table style="width: 25%"><tbody><tr> <td><p class="line862">Forward min</td>
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<td><p class="line891"><strong>10</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-24"></span><p class="line862">Left min/max</td>
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<td><p class="line891"><strong>-10/10</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-25"></span><p class="line862">Up min/max</td>
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<td><p class="line891"><strong>-10/10</strong></td>
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</tr>
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</tbody></table></div><span class="anchor" id="line-26"></span><span class="anchor" id="line-27"></span><p class="line867">
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<h3 id="head-4a4ef7f27b8135c47e1f22673febaa0f4822fbaa">Example C:</h3>
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<span class="anchor" id="line-28"></span><div><table style="width: 25%"><tbody><tr> <td><p class="line862">Forward min</td>
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<td><p class="line891"><strong>0.1</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-29"></span><p class="line862">Left min/max</td>
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<td><p class="line891"><strong>-0.1/0.1</strong></td>
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</tr>
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<tr> <td><span class="anchor" id="line-30"></span><p class="line862">Up min/max</td>
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<td><p class="line891"><strong>-0.1/0.1</strong></td>
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</tr>
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</tbody></table></div><span class="anchor" id="line-31"></span><p class="line867"><img class="attachment" src="/quake4/Notes_about_Origins?action=AttachFile&do=get&target=fx_origins.jpg" title="attachment:fx_origins.jpg" /> <span class="anchor" id="line-32"></span><span class="anchor" id="bottom"></span></div><p id="pageinfo" class="info" lang="en" dir="ltr">Notes about Origins (last edited 2005-11-04 00:01:28 by <span title="MattVainio @ 67.129.250.254[67.129.250.254]"><a class="nonexistent" href="/quake4/MattVainio" title="MattVainio @ 67.129.250.254[67.129.250.254]">MattVainio</a></span>)</p>
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