Autodesk 62205-051408-9001 User Guide - Page 363
Variation Behavior Properties, Life Opacity, Working with Particle Shapes
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Particles Operator Interface ❚❘❘ There is an additional opacity control for the particle type named Life Opacity. See Life Opacity for more information. The opacity of the shape image is also important. See Working with Particle Shapes for more information. Note: Other than visibility and opacity, the size of a particle can make it invisible. That is, a particle with a very small size may not be visible. Variation Behavior Properties The basic properties are applied to every particle of the particle type that is created. If you want variety in a property, use the variation properties. Variation creates more realistic effects. There are variation properties for eight of the basic properties. See Basic Behavior Properties for descriptions of the basic properties. When a variation property is set to 0, there is no variation; every particle created has exactly the same value for the given property. Higher values of variation result in particles that have a wider variety of values for the given property. For example, if the Size Variation property is set to 0, all new particles of this type have the same size (which is determined by the Size property). If Size Variation is set to a higher value, some particles are created larger than others. The basic size of the particles is still determined by the Size property. Weight Variation and Spin Variation-The two basic properties that have both negative and positive values (Weight and Spin) have variation properties (Weight Variation and Spin Variation). However, these properties may not produce the results you expect if you use them with the basic properties. Suppose you want the particles to spin in both directions (clockwise and counter-clockwise). You could set the Spin property so the particles have some spin, and then set Spin Variation to 10, for example. However, this would make most (if not all) of the particles spin in one direction, depending on the values you set for each property. To make an approximately equal number of particles spin in each direction, leave the Spin value at 0, and only set a Spin Variation value. Over-Life Behavior Properties There are six over-life properties that change their corresponding basic properties over the life of a particle. The basic and variation properties only determine the values for the particle at the time the particle is created. If you make the Size Over Life curve increase, for example, particles become larger as they get older. Note: To use the over-life properties, you should use the Timeline in Graph mode because the best way to see and adjust these properties is with a curve and not at a single moment in time. The over-life properties are scaling factors (in percentage), so they need to scale something. If the Size value is 0, for example, the Size Over Life values do nothing-the particles will not be visible. Note: There is no Visibility Over Life property; you set this using the Life Opacity gradient. (Also, there are no Life Over Life and Number Over Life properties.) Timeline Graphs-For the six over-life properties, the X-axis represents the particle's life in percentage. It does not matter how long the life is; 0% represents the birth (start of the particle's life), and 100% represents the death (end of its life). 347
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