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This is “Int Pressure’s” counterpart and tries to limit a fluid’s expansion tendency. With very high values it is possible to compress the fluid. Gases, for example, should have very low “Int Pressure” and rather high “Ext Pressure” values to prevent them from flying away. With both parameters it is possible Both parameters are used to fine tune a fluid’s appearance and behaviour, therefore they are fundamentally important for a realistic simulation.
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The pre-adjusted default value is also the maximum value, but it can be changed any time, if you need less. Under “Statistics” you can see two entries counting particles
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: "Existing Particles" and "Emitted Particles
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". “Max Particles” is connected to this the latter value, and if you want to stop the emitter to create more particles you can enter a smaller value. Please note that "Max particles" is based on the total amount of emitted particles. Let's say you have entered "500,000", so even if you currently have only 1,000 particles in your scene, but have already deleted 499,000 particles, RealFlow will stop creating new particles.
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