Scientific notation input for fluid viscosity seems incorrect #67186

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Neil Horman · 2019-07-18T18:55:23+02:00

Neil Horman commented

2019-07-18 18:55:23 +02:00

System Information
Operating system: Fedora 30
Graphics card: ATI radeon

Blender Version
Broken: 2.80rc1

Viscosity settings in fluid physics has an oddity when setting values < 1. I would expect a viscosity of .001 for instance to require a base of 1 and an exponent of -3. however, the exponent value cannot be set lower than 0, meaning the base needs to be set at .001

Create an object and set its physics modifier to be fluid. In the viscosity property, attempt to set an exponent value that is negative. It will always reset to 0

**System Information** Operating system: Fedora 30 Graphics card: ATI radeon **Blender Version** Broken: 2.80rc1 Viscosity settings in fluid physics has an oddity when setting values < 1. I would expect a viscosity of .001 for instance to require a base of 1 and an exponent of -3. however, the exponent value cannot be set lower than 0, meaning the base needs to be set at .001 Create an object and set its physics modifier to be fluid. In the viscosity property, attempt to set an exponent value that is negative. It will always reset to 0

Neil Horman commented

2019-07-18 18:55:23 +02:00

Added subscriber: @nhorman

Gavin Scott commented

2019-07-18 19:56:45 +02:00

Added subscriber: @GavinScott

Gavin Scott commented

2019-07-18 19:56:45 +02:00

If you read the tooltip, it appears that the Exponent value is already taken as a negative value, so entry of a positive 3 should get you the behavior you describe I think.

Neil Horman commented

2019-07-18 20:51:36 +02:00

ah, sorry, missed the tooltip. Can you tell me why that decision was made? I presume that will be confusing for materials with high viscosity (ketchup/honey/pitch/etc)

Gavin Scott commented

2019-07-18 21:00:51 +02:00

Changed status from 'Open' to: 'Archived'

Gavin Scott closed this issue

2019-07-18 21:00:51 +02:00

Gavin Scott self-assigned this 2019-07-18 21:00:51 +02:00

Gavin Scott commented

2019-07-18 21:00:51 +02:00

Unless maybe if you want to physically simulate the pitch drop https://en.wikipedia.org/wiki/Pitch_drop_experiment, my guess is the values available with an exponent of zero are likely more than sufficient.

Closing this as Invalid (sorry, we don't have a friendlier sounding resolution for things that aren't really bugs :)

Unless maybe if you want to physically simulate the pitch drop https://en.wikipedia.org/wiki/Pitch_drop_experiment, my guess is the values available with an exponent of zero are likely more than sufficient. Closing this as Invalid (sorry, we don't have a friendlier sounding resolution for things that aren't really bugs :)

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Scientific notation input for fluid viscosity seems incorrect #67186