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Looped
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bubbles
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When creating flowing and repeated effects such as fireplaces, campfires or torch fires, water in fountains, waterfalls or boiling liquid you In many cases like torches, fountains, waterfalls, etc., you can save a pretty good amount of simulation time by rendering a short looped sequence. Usually, this is done in post-production by overlapping and blending the start and the end of the looped sequence. This method is not easy, and often the result is not good, especially when particles are involved. Since version 2.2, Phoenix has the ability to make this automatically. In the Input roll-out, simply select Loop in the Time Bend Controls and adjust the looped sequence. When simply repeating a sequence, the moment where the last frame switches back to the first one will not produce smooth results. The goal of the loop adjustment is to make the loop transition invisible. The grid part of the content is looped in a trivial way, the frames are just blended linearly, but the particles need more attention and that's why the sample scene is particle oriented. What we need to know about the particle looping technique? The most important is that it is age based. You need to export the Age channel through the Output rollout to make it possible. In the typical looped simulation, particles have a relatively short life span; they are constantly produced and removed. For example, in a fountain the splash droplets are born near the top, they fall down, and when they hit the ground they disappear. The typical particle, in this case, lives about one second. For good transition of the looped sequence, you need to set the loop overlap bigger or equal to this average particle life span. If this condition is not satisfied, there will be particles that disappear suddenly and the transition will be visible. In the sample scene the average lifespan of the bubbles is about 1.5 sec and the loop overlap is set to be 50 frames. In the Input roll-out, simply select the Loop mode in the Time Bend Controls and adjust the looped sequence. In this mode, the Cache Origin parameter specifies the beginning of the looped sequence, the Length parameter specifies the length of the loop, and Loop Overlap specifies the number of overlapped frames that ensure smooth transition between the end and the start of the loop. Note that you need to have simulated at least Cache Origin + Length + Loop Overlap cached frames for this mode to work correctly. When looping particles, make sure to export the particle ID channel in the Output rollout.
Software used: Phoenix 4.41.02 Nightly from 02.09.2021, V-Ray 5 Update 1 for 3ds Max 2018
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