Autodesk 62205-051408-9001 User Guide - Page 368
Particle Display Accuracy, Background, Particles Preferences
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14 Creating Particle Effects Note: Performance may decrease if Preview is always enabled while you are adding and editing particles. Samples-Controls the number of frames that are averaged to produce the blur effect; the higher the number, the smoother the blur-but the more time it takes to draw the frames. Blur Amount-Controls the amount of the frame over which the blur occurs. When set to 100%, the particles are blurred over the entire interval between the current frame and the next one. When set to 50%, the particles are blurred over only the first half of the interval between the current frame and the next one. Intensity Adjustment-Can be used as an additional scale factor to control the visibility of intense particles. (Here, intense particles means the particle type has the Intense option enabled.) When these particles are motion blurred, their intensity can change; Intensity Adjust counteracts this intensity change. Note: You cannot animate these blur settings. In addition to effects like propellers, you can affect the trail of a particle by using motion blur. To do this, increase the number of samples or the spin. Particle Display Accuracy This setting determines how accurately particles are drawn in the viewport when the clip is not playing. Usually, you set this to 30 for complete accuracy. However, if many particles need to be calculated, or the current frame is far from the start of the clip, you can decrease the accuracy for better response. Note: Particles are always calculated from the first frame, so there may be a delay as you go farther from the start of the clip. Background Click this button to choose an operator from the workspace to use as a background image in the Particles operator. It is only used for reference, so it does not appear in the final rendered result. The feature is similar to the Background option in the Mask operator. Particles Preferences There are a few more settings for the Particles operator in the Preferences dialog. To access the preferences: 1. Choose File | Preferences (CTRL+;). 2. In the Particles category, set the preferences. Note: The OpenGL category also includes a preference used by the Particles operator; Use Texture RAM controls how background images are displayed on some OpenGL cards. For more information, see "Using OpenGL" in Chapter 5, "Compositing''. Thumbnail Size-Controls the size of the thumbnails that appear in the Library controls. The values range from 14 to 48 pixels. Always Display Emitter Shapes-When enabled, all emitter object icons and deflector icons in the viewport are always visible. When disabled, only the selected object's icon appears. (Of course, this only controls if the icons appear, not the particles themselves.) 352
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