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9<title>Speed Animation</title>
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15  <h1>Speed Animation</h1>
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17  <p>Speed animation changes the speed of a particle after emission.</p>
18  <a name="rate_animation" id="rate_animation"></a>
19  <h2>Speed Animation</h2>
20  <h3>Acceleration/Deceleration</h3>
21  <p>You can configure <I>Acceleration/Deceleration</I> from the <I>Speed</I> item on the particle set panel. You can cause particles to speed up or slow down.</p>
22  <h4>Feature</h4>
23  <p>Multiplies particle speeds by a specified value every frame.</p>
24  <h4>Parameters</h4>
25  <p>Use the following parameters to configure <I>Acceleration/Deceleration</I>.</p>
26  <table>
27    <thead>
28      <tr>
29        <th>Parameters</th>
30        <th>Description</th>
31      </tr>
32    </thead>
33    <tbody>
34      <tr>
35        <th>Ratio</th>
36        <td>Specifies the value by which particle speeds are multiplied every frame. Practical values range from 0.9 to 1.1, but you can also use values beyond this range.</td>
37      </tr>
38    </tbody>
39  </table>
40  <h4>Conceptual Diagram</h4>
41  <p>The figure below shows how the speed of a moving particle changes as the Ratio is applied.</p>
42  <img class="user_guide_chart" src="assets/particleeffect_accelaration.png" alt="Acceleration/Deceleration"/>
43  <h3>Gravity (accelerate in specified direction)</h3>
44  <h4>Main Use</h4>
45  <p>You can configure <I>Gravity</I> from the <I>Speed</I> item on the particle set panel. You can cause a particle to move in the specified direction with inertia in a realistic manner.</p>
46  <h4>Feature</h4>
47  <p>Multiplies the direction by a specified value every frame to change the particle's direction.</p>
48  <h4>Parameters</h4>
49  <p>Use the following parameters to configure <I>Gravity</I>.</p>
50  <table>
51    <thead>
52      <tr>
53        <th>Parameters</th>
54        <th>Description</th>
55      </tr>
56    </thead>
57    <tbody>
58      <tr>
59        <th>Direction:</th>
60        <td>Specifies the direction in which the particle moves in terms of X, Y, and Z values. Valid values range between -1 and 1.</td>
61      </tr>
62      <tr>
63        <th>Speed</th>
64        <td>Specifies the value to add every frame to the particle's speed.</td>
65      </tr>
66    </tbody>
67  </table>
68  <h4>Conceptual Diagram</h4>
69  <p>The figure below shows how the speed of a moving particle changes when Gravity is configured.</p>
70  <img class="user_guide_chart" src="assets/particleeffect_gravity.png" alt="Gravity"/>
71  <h3>Randomness (velocity)</h3>
72  <p>You can set randomness (speed) for animations using the <I>Speed</I> item on the Particle Set panel. You can make each particle gradually speed up.</p>
73  <h4>Feature</h4>
74  <p>Adds a random value to the particle's speed.</p>
75  <h4>Parameters</h4>
76  <p>Use the following parameters to configure <I>randomness</I> (velocity).</p>
77  <table>
78    <thead>
79      <tr>
80        <th>Parameters</th>
81        <th>Description</th>
82      </tr>
83    </thead>
84    <tbody>
85      <tr>
86        <th>Strength</th>
87        <td>Specifies the value added to the particle's speed.</td>
88      </tr>
89      <tr>
90        <th>Frame Interval</th>
91        <td>Specifies the interval for adding values to the particle's speed, as a number of frames.</td>
92      </tr>
93    </tbody>
94  </table>
95  <h5>Formula When Randomizing Child Particle Inherited Values</h5>
96  <p class="system">(Parent Particle Speed + Child Particle Speed) &times; Random Number</p>
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