Modifier Stack Order

What’s Modifier stack order?¶

The Modifier stack order is Layer .
From top to bottom, the stack will be performed in order of the sequence. It’s the important and can change the appearance of the object.

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How order affects object?¶

Modifiers are calculated from top to bottom in the stack.
In this example, the desired result is achieved by first mirroring the object, and then calculating the subdivision surface.

The Mirror modifier is the last item in the stack and the result looks like two surfaces.

Layer 1 : Subsurf affects Object
Layer 2 : Mirror affects the result of Subsurf + Object

The Subdivision surface modifier is the last item in the stack and the result is a single merged surface.

Layer 1 : Mirror affects Object
Layer 2 : Subsurf affects the result of Mirror + Object

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Layer 1 does not affect Layer 2. Layer 2 affects Layer 1.
If you want Layer 1 affect Layer 2 . The Layer 1 must be under the Layer 2. Move Layer 1 down to Layer 2.
If the modifier on the bottom, nothing else modifier affect the bottom modifier.

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The order of adding new modifiers¶

Blender default modifier tools always be added on the bottom . Never on the top, never on the middle.

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With Add-on, the new modifier will insert into proper position.

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I guess Speedflow opted for the common scenario coding it that way, which isn’t a problem since you can move that boolean order after or before the bevels to obtain different.

The weighted modifier is coded to stay on the bottom, so the boolean will never be the on the bottom. ( There’s an option whether auto add Weighted modifier on the Speedflow.)