Autodesk 62205-051408-9001 User Guide - Page 352
Emission Options, Emission Angle and Emission Range, Visibility, The emission options include In, Out
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14 Creating Particle Effects Emission Options The emission options include In, Out, At Points, and the fields for At Points. In and Out-Control the side(s) of the emitter that particles emit from. When both In and Out are enabled, particles emit from both sides. In and Out cannot both be disabled at the same time. For line emitters, you need to keep track of which side is in and which is out. For example, if you add the Matrix Falls emitter (as a line emitter), you can see the difference between In and Out. Note: The In and Out options are not available for point emitters since they do not have two sides to emit from. They are also not available for area emitters. At Points-When this option is enabled, the particles emit at discrete points along the emitter instead of anywhere along the emitter. For line and circle emitters, the field determines the number of points used for emission. When the At Points option is enabled for an area emitter, two fields appear; use one field for each side to create an array (or matrix) of emission points. Note: A point emitter is by definition already emitting at a point (so At Points is not possible). Emission Angle and Emission Range The Emission Angle and Emission Range properties determine the direction in which particles are emitted. Emission Angle 90 degrees 180 degrees 0 degrees 270 degrees Angle defines where on the emitter the particles originate. Angles larger than 360 degrees allow you to easily do multiple rotations. For example, the angle can be animated from 0 to 900 degrees. The Angle value can also be negative. Range is the spread, or variation of the angle, at which particles are emitted. The range must be between 0 and 360 degrees. When the range is 0, all particles emit parallel to each other. Emission Range is set to 120 degrees Point emitter icon Note: The emitter icon for a point emitter and area emitter shows the emission angle and range. Visibility Visibility controls the overall transparency of the emitter, which means the transparency of all the particles emitting from it. The particles become less opaque as you decrease visibility. The visibility of particles is set initially by the corresponding particle type Visibility property (in the Behavior controls). The emitter Visibility property is a scaling factor that scales particle type visibility. Note: Many of the emitter properties are scaling factors like Visibility. The other eight are Life, Number, Size, Velocity, Weight, Spin, Motion Rand., and Bounce. 336
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