thinkingParticles Subscription Drop 4 - How To Simulate Gelatin Cubes
44This Feature video Talks about Subscription Drop 4's new Viscoelastic fluid solver and how to use it to create gelatin cubes.
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VE quick tutorial 2 - Sample Scenes
Welcome to thinkingParticles Subscription Drop 4.
thinkingParticles uses a spring-based Viscoelastic fluid solver.
The viscoelastic feature can be used to create any thickness of fluid particles from rubber-like, to oil or honey like particles.
- you can even use the feature to melt object as you see this case the melting teapot.
- you can also turn the elasticity to create near-rigid bodies. What you see in this example is viscoelastic objects stacking on top of each other, and sticking to each other very stably.
This is one of the amazing things that the new feature TP 6.4 Viscoelasticity can do.
- Indeed, you will not find many products in the market today that can do this effects with a particle-based system.
- the next example shows what happen when you turn the Viscoelasticity to a softness that you get this super elastic gelatine cubes behaviour.
- Another interesting thing you can because the effects are particle - based is a constant flow of gelatinous material as shown in the next example.
Tutorial 2 - Setup
- Right menu: bring up TP click Properties for the Setup display
- the dynamicSet has 5 folders:
Create - UVS - Force - Sim - Surface.
- Under Create, we have the operators/helpers: Egg Timer - Time Interval - positionBorn - VolumePos - OR - Object and Counter:
- TimeInterval kicks of our dynamicSet.
- EggTimer is connected and another cool new feature with Drop 4, which allows for a 'Reached' status. It allows for the creation of complex oscillator setups.
- So, with the OR operator we now create an object from frame 1, and we checked the Loop option in EggTimer, as desired every twenty frames, a new object will be created, and we are setting it with a VolumePosition and we create every 20 frames a cube that is falling downwards.
- This is a very simple but efficient oscillation setup.
- Force would be the usual 'gravity' to get the cubes down.
- Next under Sim, you will see how we did the Flow setup, as well as under Surface: created with the implicitShape.
- Going to the Viewport scene, play and what you see is one of the market's fastest sim -- real time. Everything you see here is calculated on the fly, - surfacing -fluid simulation - and we can adjust parameters on the go as the scene plays out.
- Lots of power and flexibility in creating the effects you want!
- the cubes resemble soft bodies but they are not, but are actually a fluid simulation.
- *** What you need to keep in mind is the parameters under Flow Group - SPH VE 6.4: Use the VE viscoelastic solver that can be chosen from the menu.
- The list of parameters under Flow Group are still as relevant at work, example Viscosity, but the most *** important part is if you scroll down to the VE parameters: there is a lot of complexity in what you can create so spend some time playing with these adjustments.
- in this sample scene, the cubes are bouncing off each other very soft and light.
- Now we can adjust the spring-based stiffness pull and stiffness push factor and see what happens: with stiffness lowered to 0.2, the cubes are seen to compress into one another much more dramatically, flattens out and then bounces....adjusting the push - pull factor separately brings a different effect.
- Next we explore the Velocity Stickiness: this controls the stickiness of two fluids when they collide with each other.
- the higher the stickiness, the more interaction results.
- as shown, with the adjustment, the cubes now are sticky, bumps and drags other cubes.
- the Stretch Plasticity helps simulate dough-like materials, you see the sample scene, with the first cube squished and the shapes maintain a compression.
- the Threshold feature - reducing it you get a much mushier, softer fluid. It is more like dough.
- next is Density Plasticity, again a parameter that gives you a lot of creative control: this is a purely pressure based effect - the cubes are falling on each other, and squishes into each other. The threshold value decides how much pressure you need to liquify the cubes.
- Diffluence is a time based factor and decides how fast the cubes turn into fluid and the higher the value the faster it turns into fluid. It is time based and has nothing to do with pressure or anything. With a high of value 3.0 for Diffluence, you see the cubes smashing into semi-liquid pulp.
- Tearing Length, our next parameter, defines the rigidity of the fluid that is how soon will the stretchiness gives way and tears apart. As more cubes fall into the previous cube, it is torn apart.