Hello, I’m a new-comer to the blender scene, (kind of an on again off again user). I’ve been attempting to relearn the fluid simulations in 2.55 beta, and have had decent progress until now. After I attempted adding in an animated obstacle object (with no slip), all fluid sims, no matter the blender project file I use, is frozen.
The fluid does 2 things over 2 frames. First it displays the very first frame, as a rounded cube, as usual. But on the next frame the back sides of the cube vanish, and the entire animation remains in that state.
I have no idea how to fix this, but seem to remember having a similar issue back in the day while learning older versions of Blender. I have cleared my temp folder of all the bake files, rebooted my computer and started fresh projects. I cannot seem to find a simple answer to this issue.
Well… no. My mistake if I wasn’t descriptive enough… But at this point producing the error is as simple as placing a cube in a cube (default settings in 2.55beta, on a fresh blend file), assigning the outer cube as a domain and the inner as a fluid. I bake. It locks on frame 2 with a hacked off back end.
I assumed because the problem is spread across all projects I create (I cleared the temp folder of the bake files each time), and that because I’ve seen this error in earlier versions of blender, that someone might have common knowledge about a bug or obvious mistake I’m making… But I really am not doing anything more complex than, fluid goes in domain, domain bakes.
I’ve just created another fluid sim in a new file, baked it, same error. I’ll attach that one to this post. (I’ve also added an animated obstacle cube, setup as I did originally before everything went to heck.)
I’ve continued to experiment with the problem and I’ve successfully gotten that error.blend file to bake a simulation and run it correctly. I forgot to mention I was lowering the resolution of the bake to 30 final, 15 preview… On a whim I upped it to 65 final, 30 preview, and it worked just fine.
Now in the tutorials I’ve followed I was told to lower the resolution to get quick bakes if I need a general idea of what is going on with the fluid. If this is the cause of my problem it’d be helpful if anyone had some insight on the matter.
I just took a quick look, and the first thing that I noticed is that you have a negative scale on your Domain object.
This is the sort of thing that can mess up the Fluid Simulator.
Other things are: normals not re-calculated or a few normals pointing the wrong way, dis-connected vertices and the like.
So, in the 3DView, press [n] (with the Domain object selected) and look at your scale values - they’re something like -5.
Ctrl + a -> Apply Scale.
Might be something else, but that is probably the cause of the problem.
[Update]
No, that looks like about it.
The only other ‘anomoly’ that I could find, is that you start your Obstacle Cube animation on frame 0, whereas the fluid simulation always starts at Frame 1.
Though I don’t think that will affect baking the Fluid Simulation.
If you want to move the key frame to frame 1 though:
Open up a Graph Editor.
Select your Obstacle Cube Object,
De-select all the f-curves
With your mouse cursor over one of your Keys at frame 0, press [Alt] + [Shift] + Right Mouse click (RMB) to select all the keyframes on frame 0,
then press [g] grab, [x], [1], [Enter] to move them to Frame 1.
