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Every time I try to apply a Boolean Modifier, I get a "Report: Error" that reads "Modifier is disabled, skipping apply." Also, the Boolean button appears in red (is this normal?). I am just using two basic shapes, a cube and a cylinder, so the geometry can't be the problem (I guess).

Anyone know how to fix this? Have I disabled Boolean accidentally or am I just missing some step here?

Please be patient, I'm a total noob and would appreciate any input.

Thank you![enter image description here]1

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    $\begingroup$ Before you can apply the modifier, you need to set a target in the object field of the modifier $\endgroup$ – aliasguru Aug 22 '19 at 18:52
  • $\begingroup$ That works! Thank you very much. $\endgroup$ – JoeGideon Aug 22 '19 at 18:56
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If a modifier header turns red, this basically means it is doing nothing at the moment because some input is either missing or not as expected. There is an action required by the user to make it work. Here are three examples of modifiers that show this behavior:

non functional modifiers

In each case I have circled the parameter that is causing the behavior in red. Most of the time, Blender requires a reference to another object to run the modifier.

  • In case of a boolean, there must be another object you want to cut or join your main object with
  • In case of the lattice modifier, a lattice object is required that tells Blender what the rules of the deformation are
  • In case of the SubSurf the modifier is entirely skipped in the Viewport because there are simply zero subdivisions requested by the user.

These are not the only modifiers with such behavior, they are just listed here as examples. So red header means currently not doing anything at all, and as a result, clicking Apply will throw an error, because nothing can be done to the base object as a result.

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  • $\begingroup$ Thank you very much! $\endgroup$ – JoeGideon Aug 24 '19 at 16:25

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