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I was wondering about the difference between using the mirror modifier to mirror an object around the main object, and creating a collection instance then rotating the duplicates around the main object.

Is there a certain use cases for each method?.

Can I mirror parented objects together the same way as duplicating them with collection instance?

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    $\begingroup$ it depends if your object is symmetrical or not. $\endgroup$
    – lemon
    Nov 28, 2023 at 8:51
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    $\begingroup$ I guess it depends on the case, could you please describe your object, scene and project? $\endgroup$
    – moonboots
    Nov 28, 2023 at 8:51
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    $\begingroup$ Mirror modifier can make continuous surfaces, merge vertex, can clip geometry, and deal with UVs, goof for characters and single symmetrical objects. Collection instance performance optimized by nature by recycling geometry, and can symmetrize independent groups of objects, but not create single surfaces $\endgroup$ Nov 28, 2023 at 9:55
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    $\begingroup$ Well, one of the main differences is a Mirror modifier mirrors the underlying geometry of a single object (a mesh or curve), which you can change in Edit Mode, and as the name says it "mirrors", so everything gets flipped. And no matter how many separate meshes there might be, a Mirror modifier is working on a single object. Whereas a collection instance can hold many different types of objects and works in Object Mode. You cannot change the underlying geometry of the objects in Edit Mode directly in the instanced collection, you have to change them in the original collection. $\endgroup$ Nov 28, 2023 at 10:40
  • $\begingroup$ Thank you all, your comments was really helpful and informative 🌷. $\endgroup$
    – Muhanad.H
    Dec 2, 2023 at 14:39

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