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Gentlemen, I have a problem with the cloth simulation. The object I am simulating consists of 2 or more parts that are not interconnected. As a result, the simulation treats them as two separate objects.

How can I make them behave as a single one?

For example: I am modeling the German flag. It has 3 rectangular parts (Black, Red, Yellow). And the sews have stitches (which is another separate object).

Now, I want the entire flag to fall onto something but all these individual pieces don't interact as one. What is the solution? Do I need to merge it somehow? (If so, how? Boolean operations...?)

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    $\begingroup$ You have to use one mesh. You can assign different materials for each part or you can use a texture file with the flag's pattern. Try to solve the sewing with normal and/or height map without a real thread model. $\endgroup$
    – FFeller
    Sep 20, 2019 at 10:48
  • $\begingroup$ Thanks! I was thinking about that too! But when you solve the sewing using height map, how do you assign a different material to it then? It won't be possible, right? $\endgroup$
    – user3732445
    Sep 20, 2019 at 11:17

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Let's assume the stitches or other details can be represented by some cubes close to the flag geometry.

stitches

Duplicate the Flag mesh. The FlagDupe should also do the same simulation as the original. We will create a cage from it for the extras.

Add a displace modifier, and a solidify modifier. The value of the second modifier should be twice the value of the first modifier.

modifier stack

Select the stitched extra object, add a MeshCage Modifier to them and bind the object to the FlagDupe by clicking on the bind button.

bind

The bound object will follow the FlageDupe object.

simulation result

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  • $\begingroup$ That is an interesting solution! Thanks for that! $\endgroup$
    – user3732445
    Sep 20, 2019 at 15:39

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