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While there are other ways to create this same look, there aren't any that are easier to comprehend for the novice C4D user.  In this written tutorial, I'll demonstrate a simple way to create some fake looking watery liquid stuff using MAXON's new module called Mograph.  You don't necessarily need Mograph to take advantage of the tutorial, but this illustrates the ease of use.

1. Create a simple spline shape.

Using any spline tool, create a vertical spline shape.  Use plenty of z-depth value in the structure of your spline to ensure that your fake water will have some volume.

2. Animate the spline shape.

You can decide to use PLA (Point Level Animation) to animate the structure of the spline, or simply add keyframes for the position of the spline.

I've used the latter for an easy solution, animating the splines position on the Y-axis only, from +Y to -Y.  You can set the values to taste.


First, simply put the spline into a Metaball object.  This will create a blobby geometry around the structure that the spline describes.

With the spline selected, hold down the OPTION/ALT key, and select the metaball object from the standard objects icons.  This will apply the metaball as a parent to the spline.

Select the Metaball object, then change the object's attributes.  The Hull value describes how the balls adhere to each other.  Set Hull to 80%.   The subdivisions describe how smooth the object is in the editor and in the renderer.  The lower the value, the MORE subdivision will occur.  Lower subdivision equals more computing time.  Keep it high while you're editing, low when you render (unless you want a chunky look).

4. Mograph : SPLINE MASK

This is an alternate  take on a similar tutorial (found here: http://maxon.digitalmedianet.com/articles/viewarticle.jsp?id=45523)

However, this is basically the same method.  In Mograph, there is a spline boolean operator which will allow you to subtract the region of one spline from the area where this animated spine exists.

Add a Spline Mask from the Mograph objects as a parent of the initial spline, and a child of the metaball object.

The spline mask is a boolean operator, and as such needs a "B" value. 

Create a spline object (Rectangle) and add it to the spline mask as a child in the "B" or second position.  

Change the Spline Mask object property:

Mode = A intersect B or B subtract A.  These will allow the metaball object to create blobby geometry only where the two exist.



5. Fake liquid texture

You can use any recipe that works for your scene. 

You can download the scene here to use as a starting point for your own fake liquid experiments.

You'll need CINEMA 4D R.96 and Mograph to take advantage of the entire project.  If you don't already have the application, you download a working demo from http://www.maxoncomputer.com

Download the project file here

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Ko Maruyama is a freelance animator in Los Angeles.  In addition to working on film and broadcast animations, Ko teaches at Pasadena's Art Center College of Design - focusing on motion design.  When working, writing or testing software allows, you can find him lending a hand in the After Effects board and lurking among the Cinema4D, Visual Effects and Photoshop posts within the DMNForums.
Related Keywords:ko maruyama, liquid, path deformer, cinema 4d, maxon, metaballs, emitter


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