Autodesk 62205-051408-9001 User Guide - Page 358
Intense, Preserve Color, Attach to Emitter and Amount, and most common value is 100%.
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14 Creating Particle Effects Intense The Intense option is used to make particles appear bright by using the Additive transfer mode. Where the particles overlap, they are added until they become saturated. For this reason, particles with Intense enabled look best when on a dark background (preferably black). Note: Enable the Collide with Edges option in the preview menu to see the effect of Intense more clearly. Preserve Color The Preserve Color option is only available when the Intense option is enabled. Intense particles blend with backgrounds additively. Because of this, intense particles over lighter backgrounds tend to wash out. Over white, for example, intense particles themselves become white, and are therefore invisible. The Preserve Color option maintains the additive blend mode, but instead of blending with the color values in the background, the particles are blended with transparency. As a result, you can have the intensity of particles that blend additively with each other, but without having to worry about the background washing out the effect. Using the Preserve Color option decreases performance, so you should use it only when needed. It is not needed when using a black or darker background. Attach to Emitter and Amount The Attach to Emitter option is used to connect the particles to the emitter so when the emitter moves the particles move with it. Usually, this option is disabled. Note: You can see the effect of the attachment by dragging an emitter in the preview, first with the option disabled and then with it enabled. Attach to Emitter is enabled as the emitter moves. When you enable Attach to Emitter, the Amount field becomes available. This field controls how attached to the emitter the particles are. The default (and most common) value is 100%. If you use the Particles operator on a layer in a composite, you can animate the position of the layer (or animate the camera's position in a 3D composite) to simulate a camera dolly shot. If you do this, all emitters and particles move together. However, if the Particles operator is only added to footage (the Particles operator does not flow into a layer), you could not move an emitter across the scene to simulate a change in viewpoint because the emitter would leave a trail of particles. This is one case when you can enable Attach to Emitter. Attach to Emitter is disabled as the emitter moves. For example, if the viewpoint needs to move across a waterfall scene, the water would not fall correctly if you simply animated the emitter position. The 342
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