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RealFlow | Cinema 4D uses an internal proxy representation of a collision object – the so-called collision geometry. In order to refine this proxy object you have to add a → "Volume" tag and decrease → "Cell Size" or choose a better → "Collision Geometry Detail" option. You can also control the shape and look of the poxy through the → "Collider" tag's "Show Collision Geometry" option.
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With fast moving particles and/or a very small number of simulation steps per frame it might happen that a particle in a starting position goes to a final position in the next simulation step that is at the other side of the collision geometry:
- To avoid this, activate the "Collider" tag's → "Continuous Collision Detection".
- By default the auto mode is enabled, and RealFlow | Cinema 4D will decide automatically, if the collision object requires "Continuous Collision Detection".
- Collision detection is computationally more intensive, and simulations take longer.
- In some cases the automatic detection fails, and you have to disable enable "Continuous Collision Detection" manuallyGo to Scene > Solver and disable the → "Auto Params" option to get access to the "Min Substeps" and "Max Substeps" parameters.
- Increase the values to 4 and 8 and simulate again.
- If the particles still leave the object you have to increase both values again in moderate steps of 2 until the object is watertight.
- An additional option is to increase the → "Surface offset" value of the collision object's "Volume" tag. A good starting value is →
Cell Size * 0.5. - Finally, activate the "Collider" tag's → "Continous Collision Detection" option.
I have enabled "Continuous Collision Detection", but there are still particles going through my collision object. Why?
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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".
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Open the → material panel and go to the "Editor" section. Then enable "Animate Preview...".
I have activated the "Animate Preview..." option, but still I cannot see the wetmap. Why?
Wet-dry maps require an UVW tag attached to the object. You will get this tag automatically when you make your object editable.
Why can I see the wetmap in the render, but not in the viewport?
Open the → material panel and go to the "Editor" section. Then enable "Animate Preview...".
The wet map is distorted, mirrored or repeated. How can I fix this?
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