set the sofbody to be not solid

[wwfx]

Hi all,

I just upgraded to RF5 and I want to setup my soft body to be not solid, like it was in RF4, and I can't find any option like this.
Any help would be much appreciated.

Peter.

[gus]

Hi Peter,

Welcome to the forum.
Would you mind explaining a bit more the effect that you are after with the softbody?
I don´t really understand what you mean by "not solid".

Cheers,

g-)

[wwfx]

Hi Gus,
Thanks for your response.
I have an object with some detached vertices, it should look like a torn bag.
In RF4 there is an attribute called "Solid". When I leave it in "No" mode the detached vertices are falling apart.
I can't recreate that in RF5.

RF4:


RF5:


Any help will be much appreciated

[gus]

Hi Peter,

The Body Dynamics solver in RF5 has been re-written from scratch and things like softbodies work in a completely different manner to what we all were used in RF4, so not only most of the parameters have changed, but also some has dissapear, as you already know. The way to achieve effects like this may need a bit of planning in your 3D package before exporting to RF. The key point here is that you will need to use MultiJoints to 'sew' those vertices and make them break with the forces that you can set up in the MultiJoints node.
You could try to define multiple shapes that form your 'sphere', sew them together using unlimited forces in all the parts, except the ones you want to break appart, which you can either leave freely or set constant force, plasticity, etc...
I will try to mocap a quick setup for you tomorrow since I know it can be a bit cumbersome. I hope that at least is effective and works in a similar way to what you were used in RF4, but better.

g-)

[wwfx]

Hi Gus,
Thank you very much for suggestion. I will try it.

Peter.

[wwfx]

Hi Gus,

Following your suggestion to 'sew' some shape with multijoint I made a test with two Vases - native RF objects.
To sew them I used "At locators position" mode in multijoint node. Positioning of the locators was really cumbersome,
maybe I need to write some script to do that. Possibility of importing locator objects from Maya is better solution but I can't do that due to SD export limitation.
Sewing the shapes works for me but I get a huge slow down in simulation time which is due to open geometry of used shapes like vase or hemisphere.

I made following test:
I have a simple collision plane for ground, gravity field and soft body object for dropping.

first test:
dropped object: cylinder (native RF) - 40 faces
simulation time for 50 frames: 9sec.

second test:
dropped object: hemisphere (native RF) - 64 faces
simulation time for 50 frames: 1min 47sec.

I'm using RealFlow 5.0.3.0190, Linux x64 Fedora11

Peter.

[gus]

Hi Gus,
Possibility of importing locator objects from Maya is better solution but I can't do that due to SD export limitation..

Hi Peter,

When we talked 'locators' in Caronte Multijoints, you can use any geometry, not only locators as such, so you can do the setup quite easily in Maya by simply using small cubes for example.

g-)

[wwfx]

Thank you very much Gus, I have no thought about that.

About slow down in soft body simulation with open shape geometry is that something that you have not improved yet
or it's some kind of bug?

Peter.

[nuria]

Hi Peter!

This is a good question. It could be a bug. We will investigate it... and fix it if necessary.
Thanks a lot for the report.

Nuria

[wwfx]

Thank you very much Nuria.