Fluid/Smoke modifier has an "Apply" button, which is misleading/dangerous (only meaningful for mesh-baked liquid domains) #72916

New Issue

Nicola De Mitri · 2020-01-05T14:26:10+01:00

Nicola De Mitri commented

2020-01-05 14:26:10 +01:00

(All systems)

Blender Version

2.81a and earlier (pre-mantaflow)
and 2.82 Alpha (2020-01-05) 5c66739b78 (mantaflow)

Short description of the error
All objects involved in a fluid (gas or liquid) simulation, including domains, effectors, etc, have a modifier in the modifier stack.

However, in all cases except one, the "Apply" button in this modifier is (as far as I can tell) just a synonym for "remove the modifier and the physics settings (destructively!)". It only actually "applies" something when we're dealing with mesh-baked liquid domains.

Such "Apply" button may be misleading and dangerous if a user were to, for instance, try to "freeze" a frame of a smoke simulation, which will just result in them losing all cache.

(All systems) **Blender Version** - 2.81a and earlier (pre-mantaflow) - and 2.82 Alpha (2020-01-05) 5c66739b782e (mantaflow) **Short description of the error** All objects involved in a fluid (gas or liquid) simulation, including domains, effectors, etc, have a modifier in the modifier stack. However, in all cases except one, the "Apply" button in this modifier is (as far as I can tell) just a synonym for "remove the modifier and the physics settings (destructively!)". It only actually "applies" something when we're dealing with mesh-baked liquid domains. Such "Apply" button may be misleading and dangerous if a user were to, for instance, try to "freeze" a frame of a smoke simulation, which will just result in them losing all cache.

Nicola De Mitri commented

2020-01-05 14:26:10 +01:00

Added subscriber: @NicolaSap

Jeroen Bakker commented

2020-01-06 11:19:06 +01:00

Added subscriber: @Jeroen-Bakker

Jeroen Bakker commented

2020-01-06 11:19:06 +01:00

This is a limitation of the current modifier stack.
The mesh of a fluid simulation can be applied. Smoke is a fluid simulation, but without a mesh. There is a global flag to check if the apply button should be drawn or not. Removing this would also remove it from a fluid simulation where it has functionality.

This is a limitation of the current modifier stack. The mesh of a fluid simulation can be applied. Smoke is a fluid simulation, but without a mesh. There is a global flag to check if the `apply` button should be drawn or not. Removing this would also remove it from a fluid simulation where it has functionality.

Jeroen Bakker commented

2020-01-06 11:20:41 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser removed the

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Fluid/Smoke modifier has an "Apply" button, which is misleading/dangerous (only meaningful for mesh-baked liquid domains) #72916