Autodesk 62205-051408-9001 User Guide - Page 375
About Circle Emitters, Reordering Emitter Objects, Turning Off Emitters, Replacing Emitters
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Working with Emitter Objects ❚❘❘ In fact, if the line emitter is made very short-almost a point emitter-it is possible that no particles will be emitted. Likewise, very long line emitters may emit too many particles. Therefore, you may need to adjust the emitter Number property. About Circle Emitters A circle emitter can be elliptical (oval shaped) or circular. The number of particles that a circle emitter creates is based on the size of the circle. Small circles may emit too few particles, and large circles may emit too many. Use the emitter's Number property to compensate. About Area Emitters Area emitters are rectangular, and particles are created everywhere within the rectangle (unless At Points is enabled). Reordering Emitter Objects The order in which an emitter appears in the Workspace panel determines whether its particles are drawn in front of, or behind, the particles of other emitters. The top emitter is drawn last (on top of the others in the viewport). To reorder emitter objects: 1. Select the emitter object in the Workspace panel. An emitter object appears on the top of the stack after you add it, so the order they are drawn is from bottom to top. 2. Drag it up or down, and release when the line is where you want the emitter object. Note: The order the particle types appear in the hierarchy (in Timeline or Workspace panel) is not important and cannot be changed. Turning Off Emitters You can turn off an emitter so that no particles are created. To turn off an emitter: 1. Show the Workspace panel (F3). 2. Click the yellow box next to the name of the emitter. You can also select the emitter, show the Emitter controls (in the Particle Controls panel), and disable Active Emitter. Note: There are very few cases where you animate the Active Emitter property. Usually, you want particles to linger and fade out, so you animate Number instead. Replacing Emitters You can replace an emitter object by replacing some or all of its properties with the properties from the selected library emitter. By doing this, you save time because you can keep any preserved emitter properties and their animations. All particle types of the emitter object are replaced, as is its name. You can select which of the emitter properties and transforms to preserve. For example, if the emitter in the viewport uses a changing Zoom property to simulate moving into the distance, you can preserve the Zoom property so the library emitter's Zoom values do not replace the emitter object's Zoom values. Note: Shape, Preload Frames, Preserve Alpha, Ignore Motion Blur, Particle Ordering, and Emission Options (In, Out, and At Points) are not on the Replace Emitter Options dialog. These properties are easy to set, so they are always replaced. Any animation on the preserved emitter properties or transforms is automatically preserved. 359
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