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Hello everybody and welcome to a new section in this section.
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We're going to be looking at the Domain and how it changes how the simulation looks to get started.
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Let's go ahead and create a small scene for example with this cube selected.
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I'm going to press us to scale and then I'll drag it up.
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This is going to be our domain for this demonstration next I'll add in a mesh and then a cube and they'll
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present and go into wireframe.
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This is going to be our flow object.
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So I'm going to move it up along the z axis and then also like the domain and go over to the physics
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tab.
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If I select fluid I can see there is a type option here there are three different types domain flow
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and effector in this video we'll be looking at the Domain.
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So let's go ahead and select that in the domain type.
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It's currently set to gas which would be fire and smoke since we're dealing with liquid.
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We need to change it over to the liquid simulation.
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And as you can see there is quite a lot of different settings over here to go through.
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Don't worry we'll go through each one and you'll learn exactly what they do.
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Let's first start out with the top settings up here.
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We have the domain type which we already looked at.
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Gas is for fire and smoke and liquid is for the fluid simulation.
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The resolution division's controls how good the simulation will look.
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The higher you set this to the better it will look but the longer it will take to bake you can go lower
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all the way to a value of 24 and this will look really really low poly.
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I find that a value of about 256 gives us a really really nice high rez simulation.
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For now though we will just leave it at 60 for the time scale controls how fast the simulation will
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look.
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As you can see on screen there is two different simulations one is a time scale of point five and one
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is a time scale of one I've noticed while testing around with the time scale that a value of one the
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default value looks really fast for a realistic simulation.
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I would probably set the timescale to a value of about point five or point six underneath that we have
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the CFL number.
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This is a little bit confusing but how this works is it deals with time steps the higher you set this
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to the more time steps it will skip.
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And what this will do is it will speed up your baking time.
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But the simulation won't look as realistic.
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The lower you go the more time steps will be in the simulation but the longer it will take to bake use
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adaptive time steps allows you to set how many times sets will be per frame and it will automatically
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calculate it.
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We have a maximum and a minimum value.
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The higher you set this to the better the simulation will look.
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But again the longer it will take to bake if you have a simulation where there is a lot of fluid that's
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really jittery or it just doesn't look as good or it's passing through an object try turning up the
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time steps in that will fix your issue and then underneath that we have the gravity.
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Currently it's great out and that is because we need to jump over to the settings over here in the scene
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settings and turn off gravity in the world settings.
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Once we do that we can jump back over to the simulation and we can see here and now we can set these
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settings over in the scene panel that Z is at a negative nine point eight and if you wanted to do that
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same number you would set that for the z axis here or if you wanted to play around that you can set
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the x axis to a positive number.
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And what this will do is it will make the gravity go in the x direction.
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Same thing goes for the z axis.
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If I would set this up to a value of 10 instead of falling down it would go straight up and land on
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the ceiling.
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The last thing that we have here is the border collisions.
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If these are turned on the fluid will collide with the sides of the domain.
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We can also turn them off.
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This will give an illusion of the fluid just disappearing off into the distance of the domain.
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So there you go that is the basic settings of the domain and in the next video we will take a look at
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the liquid particles.
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