Why do clones disappear when placed inside a Symmetry object?
Posted: 12 October 2021 08:50 AM   [ Ignore ]  
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Joined  2019-07-21

I have a complex track roller system that has to be mirrored in a scene. The roller tracks render fine in the original configuration, but when I drop it into a Symmetry object, the clones disappear.

Reference model attached.

In this particular design I have a Xpresso rig for controlling the length of the roller set in the cloner. This might be a factor. However, I’ve had this happen before with complex structures that don’t use Xpresso. It’s as if the Symmetry has a limit for how many clones it can duplicate.

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Conveyor_Cloner_Symmetry.zip  (File Size: 173KB - Downloads: 19)
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Posted: 12 October 2021 09:17 AM   [ Ignore ]   [ # 1 ]  
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Hi fordmar,

Thanks for the file!

In the “Roller Cloner,” you had multi instances enabled; that seems to be the problem here. Switch that to Instance.

However, just create one setup, then use a new Parent Cloner and set that to Multiple Instances, which will speed up your scene.
Perhaps it is a limitation of the demo file, but I do not see a need for a Symmetry object here.
Example
https://www.amazon.com/clouddrive/share/yE3sbthJvFidrKgqIYE8VPkkZ82Zw05yoNrwXe72ZQD

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Posted: 12 October 2021 09:52 AM   [ Ignore ]   [ # 2 ]  
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Cool! That fixed it smile

But I thought multi-instance was the preferred setting when you had a lot (and I mean a lot) of clones? Just not in conjunction with a Symmetry?

Yes - the demo file is just the portion of the assembly that wasn’t rendering right. Many other assemblies that loop and tuck. So the Symmetry is pretty essential as they all have to be mirrored - i.e. right hand, left hand.

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Posted: 12 October 2021 09:57 AM   [ Ignore ]   [ # 3 ]  
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Thanks for the reply, fordmar.

Yes, that is true, that is the most efficient way. But the shortcoming of Multi Instances is, they don’t really exist, hence why they are fast. It is more data in the pipeline than individual information each time. In this way, these “virtual models” are not seen by other “copy-machines”.

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

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Posted: 12 October 2021 10:30 AM   [ Ignore ]   [ # 4 ]  
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Ah, makes sense.

BTW: Turning off Generators in layers makes a HUGE difference. The dragginess is reduced in accord with how many Generators are turned off. When all are off, things spin around like a bird - which it wasn’t doing before. So that one little switch is speeding things up enormously.

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Posted: 12 October 2021 12:23 PM   [ Ignore ]   [ # 5 ]  
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Thanks for posting the #4 in the other thread as well.

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

Photography For C4D Artists: 200 Free Tutorials. Texture, Panorama, HDRI, Camera Projection, etc.
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