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9<title>Position Animation</title>
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15  <h1>Position Animation</h1>
16  <!-- InstanceEndEditable --> <!-- InstanceBeginEditable name="本文" --> <a name="animation_position" id="animation_position"></a>
17  <p>Position animations are configured using the <B>Position </B>category of the <B>Properties </B>panel for particle sets.</p>
18  <h2>Position Animation</h2>
19  <p>Create a position animation to change its position after it has been emitted.</p>
20  <p>You can configure the following three settings for position animations.</p>
21  <ul>
22    <li>Add in specified direction</li>
23    <li>Spin</li>
24    <li>Random (position)</li>
25  </ul>
26  <h3>Add in specified direction</h3>
27  <p>Use the <I>Add in Specified Direction</I> setting to cause a particle to <I>move at a set speed</I> in the specified direction.</p>
28  <h4>Feature</h4>
29  <p>The specified value is added to the particle's position every frame. The particle moves without inertia at a set speed.</p>
30  <h4>Parameters</h4>
31  <p>Use the following two parameters to configure <I>Add in Specified Direction</I>.</p>
32  <table>
33    <thead>
34      <tr>
35        <th>Parameters</th>
36        <th>Description</th>
37      </tr>
38    </thead>
39    <tbody>
40      <tr>
41        <th>Direction:</th>
42        <td>Specifies the direction in which the particle moves. Specify in the XYZ directions in the range of -1 to +1.</td>
43      </tr>
44      <tr>
45        <th>Speed</th>
46        <td>Specifies the value to add every frame to the particle's position.</td>
47      </tr>
48    </tbody>
49  </table>
50  <h4>Conceptual Diagram</h4>
51  <p>The figure below shows a constant-speed animation made by adding a speed value every frame to the particle position.<br /> By animating the direction of movement, you can change the particle's direction. (This cannot currently be animated.)</p>
52  <img class="user_guide_chart" src="assets/particleeffect_move.png" alt="Add in specified direction"/>
53  <h3>Spin</h3>
54  <p>By setting the spin, you can add rotational motion to all particles.</p>
55  <h4>Feature</h4>
56  <p>The specified value is added to the angle. The particle rotates at a set speed without inertia.</p>
57  <h4>Parameters</h4>
58  <p>Use the following two parameters to configure <I>Spin</I>.</p>
59  <table>
60    <thead>
61      <tr>
62        <th>Parameters</th>
63        <th>Description</th>
64      </tr>
65    </thead>
66    <tbody>
67      <tr>
68        <th>Axis</th>
69        <td>Specifies the axis along which to rotate the particle.</td>
70      </tr>
71      <tr>
72        <th>Angular Velocity</th>
73        <td>Specifies the angle by which the particle will rotate along the specified axis in one frame. Practical values range from -20 to 20, but you can also use values beyond this range.</td>
74      </tr>
75    </tbody>
76  </table>
77  <h4>Conceptual Diagram</h4>
78  <p>The figure below shows the effect of adding an angular speed of 45 to the particle position, and rotating at a constant speed around the Y-axis.</p>
79  <img class="user_guide_chart" src="assets/particleeffect_spin.png" alt="Spin"/>
80  <h3>Random (position)</h3>
81  <p>Setting <B>Randomness (position)</B> allows you to make particles quiver slightly.</p>
82  <h4>Feature</h4>
83  <p>You can add a random value to the particle's position.</p>
84  <h4>Parameters</h4>
85  <p>Use the following two parameters to configure <I>Random (position)</I>.</p>
86  <table>
87    <thead>
88      <tr>
89        <th>Parameters</th>
90        <th>Description</th>
91      </tr>
92    </thead>
93    <tbody>
94      <tr>
95        <th>Strength</th>
96        <td>Specifies the direction and strength of the force applied to a particle.</td>
97      </tr>
98      <tr>
99        <th>Frame Interval</th>
100        <td>Specifies the interval for adding values to the particle position, as a number.</td>
101      </tr>
102    </tbody>
103  </table>
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