Help with Lagoa fluid simulation

[TonyMag]

Hi guys!

So, Im running this fluid sim using lagoa and while for the most part the simulation looks ok, when the particles fall they look like they are moving in slow motion? They are not falling as fast as you would expect. Any idea what would cause that/which parameter affects this?

Thanks for any help!

[gustavoeb]

By default Lagoa is setup as if 1 SI unit = 1 meter.
To solve this, multiply your gravity by 10.

The faster motion will probably lead you to use more substeps.

[TonyMag]

By default Lagoa is setup as if 1 SI unit = 1 meter.
To solve this, multiply your gravity by 10.

The faster motion will probably lead you to use more substeps.

Hi Gustav,

Hm, this is interesting. I completely forgot about the whole scale thing in softimage (always confusing...)
At the moment the scene was setup as if 1 SI unit = 0.1 meters (10 centimeters).

The effect I'm trying to achieve is a small lava explosion, so I'm using a cube (20 SI units) as a volume emitter.

What should the gravity be in this case?? Also, are there other parameters that would affect this and which?

Thank you very much for your time

[gustavoeb]

For SI = 0.1 meters you should use a gravity of 98 SI units

For further convertions type this in google

Code: Select all

9.8 m/s to dm/s

9.8 m/s being earths gravity
dm (decimeter) in case you your SI unit is equivelant to 0.1 meters
s being ICEs default measuring unit for time

[TonyMag]

For SI = 0.1 meters you should use a gravity of 98 SI units

For further convertions type this in google

Code: Select all

9.8 m/s to dm/s

9.8 m/s being earths gravity
dm (decimeter) in case you your SI unit is equivelant to 0.1 meters
s being ICEs default measuring unit for time

So the ONLY parameter I have to adjust is the gravity?? No other parameter affects the way the fluid behaves?? (in relation with the scale I mean)

[gustavoeb]

well of course all other aspects of your fluid will make a difference on how it looks... water that brakes up into little pieces easlisy (aka low internal pressure) will look like being of a bigger scale, for example.

that said, as far as your first concern (particles looking like they are in slow motion) gravity is enough.

[TonyMag]

well of course all other aspects of your fluid will make a difference on how it looks... water that brakes up into little pieces easlisy (aka low internal pressure) will look like being of a bigger scale, for example.

that said, as far as your first concern (particles looking like they are in slow motion) gravity is enough.

Got it! Thanks Gustav!