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In Blender 3.3.0, "Quick liquid" creates a domain which is rendered as a glass cube.

I tried in several ways but please check the most straightforward one:

  1. Brand-new Blender session startup setup
  2. Change the engine to Cycles, render the default cube without problem default render output
  3. Apply Quick liquid quick liquid setup
  4. Without any further modification, it renders the following: quick liquid render

Thank you very much for your help in advance!

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  • $\begingroup$ Welcome to BSE. Would you mind editing your question and clarifying exactly what you expect to happen when you hit render? As per the steps you outlined, Blender is attempting to create liquid from the default cube. The simulation is pretty ugly with the default settings, but it is behaving as it should. What you are seeing in the render is the default cube, plus the simulated liquid. $\endgroup$
    – SlickRed
    Oct 4, 2022 at 16:42
  • $\begingroup$ Please watch tutorials on fluid simulation. $\endgroup$
    – Gordon Brinkmann
    Oct 5, 2022 at 9:39

2 Answers 2

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Quick Liquid does 2 things.

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It sets up a domain object (some cube-like shape) around the currently selected object. It gives this object a default glass material and sets it to be displayed as a wireframe in the viewport.

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It turns on fluid domain physics for the domain object. For the selected object (your default cube) it sets up fluid emitter physics.

So the behavior you're seeing is perfectly normal.

You might want to learn more about fluid simulation in Blender.

Here's a CGCookie tutorial that might have some good info for you: https://www.youtube.com/watch?v=6B0QM4Cft5c

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  • $\begingroup$ Dear Samuel - my bad, the advices and the link helped a lot! Really perfect tutorial, now everything looks perfect! Thank you very much! $\endgroup$
    – István Horváth
    Oct 5, 2022 at 11:12
  • $\begingroup$ Happy to help, István! $\endgroup$
    – Samuel
    Oct 5, 2022 at 15:34
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The quick effect operators only set up an object for a given type of simulation, you have yet to actually do the simulation, aka "bake" it.
For a liquid, specifically, baking will deform the domain mesh into the simulated liquid shape. If nothing is baked, then the domain just keeps its normal form: a cuboid.

By default, the baking occurs when you start a playback from the start frame.
So you can hit ⇧ Shift← Left arrow to jump to the start frame, and then hit space to playback. You should see the domain mesh deform frame after frame. It might take a while depending on your machine, so be patient.

You will also need to enable the mesh option on your domain settings:

mesh option

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    $\begingroup$ Keep in mind that to see the mesh deform/simulate(instead of just particles), you have to enable the Mesh option in the domain settings before you bake. $\endgroup$
    – Samuel
    Oct 5, 2022 at 4:58
  • $\begingroup$ Dear L0Lock, thank you very much - patience and enabling Mesh option helped a lot, it took some time to see the results - but definitely worth it. :) Thank you! $\endgroup$
    – István Horváth
    Oct 5, 2022 at 11:14

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