05-04-2020, 10:57 AM
Yo bro. 
Turn off the flow, do the changes, then turn it on?
You can increase voxel size to 2cm, and it will be lot faster, but it will behave a little bit different probably.
Yes.
I did that for few reasons (separate model for birth).
- First one is that according to your image, the volume was not full, but halfway full
- Collision model have shell, and it's a very slightly larger then the birth model, that doesn't have shell (so tyflow can birth on it's volume), Also, collision model doesn't have, doesn't need that cylinder shape inside it, just an opening.
One way or another, you need to give them time to settle, because we are using small spheres, so they have "space" when they are born as voxels. If we would use small boxes, maybe they would not have that space, and they would be settled right away, but then again, with boxes you would not have organic feel for the sim.
Just render from where they are already settled, or born then in -30 frame, or something.
You can use second Tyflow to born them after they settle, but I think that would be over too much of a hassle.
Just the personal preference, and gravity has nothing to do with voxel size.
Here's the logic behind it.
My scene is in cm, and I assume that tanker is very big (like 5 meters in height maybe), but I create it very small, maybe 50cm (10 times smaller), lowering gravity will compensate for that. If you do your scene at correct scale, you don't need to lower the gravity.
Don't overthink it though, just place the gravity you feel is most natural.
Shape operator works perfectly. :
It does let you specify scale, but if you don't turn the scale on, it will automatically take scale you defined in the birth voxel operator.
So, if you want to change scale on your particles, just use a birth voxel.
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Hope this helps.
Quote:Any tips for making small changes and not waiting for it all to regenerate?
Turn off the flow, do the changes, then turn it on?
You can increase voxel size to 2cm, and it will be lot faster, but it will behave a little bit different probably.
Quote:- so basically you set up a hidden volume of any shape to fill with voxels then the outer visible volume is the physx collider?
Yes.
I did that for few reasons (separate model for birth).
- First one is that according to your image, the volume was not full, but halfway full
- Collision model have shell, and it's a very slightly larger then the birth model, that doesn't have shell (so tyflow can birth on it's volume), Also, collision model doesn't have, doesn't need that cylinder shape inside it, just an opening.
Quote:- how can I completely stop the voxels from moving before I pull the plug? This would be important to make it look real, everything is still to start.
One way or another, you need to give them time to settle, because we are using small spheres, so they have "space" when they are born as voxels. If we would use small boxes, maybe they would not have that space, and they would be settled right away, but then again, with boxes you would not have organic feel for the sim.
Just render from where they are already settled, or born then in -30 frame, or something.
You can use second Tyflow to born them after they settle, but I think that would be over too much of a hassle.
Quote: why do you have to halve gravity when the voxels get smaller?
Just the personal preference, and gravity has nothing to do with voxel size.
Here's the logic behind it.
My scene is in cm, and I assume that tanker is very big (like 5 meters in height maybe), but I create it very small, maybe 50cm (10 times smaller), lowering gravity will compensate for that. If you do your scene at correct scale, you don't need to lower the gravity.
Don't overthink it though, just place the gravity you feel is most natural.
Quote:Seems the shape operator doesn't let you specify exact size sphere.
Shape operator works perfectly. :
It does let you specify scale, but if you don't turn the scale on, it will automatically take scale you defined in the birth voxel operator.
So, if you want to change scale on your particles, just use a birth voxel.
--------------------------------
Hope this helps.