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Why
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is
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The quality of the collision geometry also plays a role and you can adjust in the → "Volume" tag's parameters. → "Cell Size" and → "Surface Offset" are the crucial parameters. And when you click on → Collider > Display > Show Collision Geometry you can see the internal object.
Why is there a gap between the particles and the collision object?
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If your object is an open, single-sided shell then you will always see a more or less small gap between the object's surface and the fluid. The reason is that RealFlow | Cinema 4D creates a layer around such an object to make it watertight. The thickness of this layer is Cell Size * 3 on each side of the polygon shell.
Why are simulations with rigged characters, point level animated objects (PLA), or objects with scale changes slow?
With PLA-enabled objects, RealFlow | Cinema 4D creates an internal collision geometry from the object for the interaction with particles. When the base object has deformation/PLA, or a change in scale the collision geometry has to recalculate the internal collision geometry with every single simulation step. Especially with small → "Cell Size" values PLA can be a simulation's bottleneckto be recalculated during the simulation. And, depending on the complexity of the base object, this takes some time and slows down the simulation. The most effective workaround is to reduce the number of polygons as far as possible or use low-res proxy objects.
The quality of the collision geometry also plays a role and you can adjust in the → "Volume" tag's parameters. → "Cell Size" and → "Surface Offset" are the crucial parameters. And when you click on → Collider > Display > Show Collision Geometry you can see the internal object.
I can see particles going through my collision object. What's happening here?
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- increasing the number of → simulation steps (aka "substeps")
- changing the "Volume" tag's → "Volume mode" to "Shell"
- increasing the "Volume" tag's → "Surface offset".
- decreasing the particles' velocities through → "k Speed" and → "Drag Force" daemons.
I have activated the "Animate Preview..." option, but still I cannot see the wetmap. Why?
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No, RealFlow | Cinema 4D does not change the motion or shape of Cinema 4D dynamic bodies, but they are able to collide.
I see exploding particles when they interact with objects, for example when I try to fill a glass. What's going on?
RealFlow | Maya works with adaptive substeps by default and this means that RealFlow determines the actual number of substeps. When particles settle, the number of substeps decreases, and this means less precision. As a consequence physical effects inside the fluid start to accumulate until a "pop" occurs. After the explosion the particles settle again, and RealFlow increases the number of substeps - the beginning of a new cycle. To avoid this effect increase the number of → "Min Substeps" and/or → "Min Iterations".