(26-11-2021, 10:04 PM)benro Wrote: I created a cube (with default blueprint settings) and tried pressing down on the top of it with an Obi collider, but was not able to effect much change in it's surface. I tried adding in volume sampling, and playing with the shape matching constraints, but nothing seemed to make a difference.

Before I invest too much time trying to figure it out on my own, I just wanted to check to see if this is even possible? The effect I am going for is sort of like this.

I watched the tutorial videos and looked at the manual but was not able to find this addressed anywhere.

(26-11-2021, 11:09 PM)josemendez Wrote: Hi!

Yes, it's perfectly possible to do this. The detail you get is a direct consequence of how finely detailed your mesh is, and the resolution of your particle sampling in the blueprint. The default blueprint resolution is low-ish though, you'd need to crank up the resolution.

If you're using a regular, default cube mesh -Unity's default cube for instance- you won't be able to get anything remotely similar to what you're after no matter what you try: each cube face is only made of 2 triangles. It's of course impossible to bend or deform such coarse geometry in any meaningful way, so you need to use a more finely subdivided mesh.

(08-12-2021, 09:01 PM)benro Wrote: I made a cube mesh in blender that has a total of 32 triangles in it's top surface, and then I created a softbody surface blueprint with a surface sampling resolution of 64 using it.

The cube that results definitely has some softbody characteristic - namely, it bounces when it hits the ground. However when I "poke" it with an Obi collider, the collider just passes through it. I am trying to make it cause a concave depression in the surface of the cube.

FWIW, this is the "stick" I use to "poke" the softbody by dragging it in the Scene window while in play mode: https://postimg.cc/H8DR8S51

I tried playing with some the settings in blueprint editor, adjusting the sliders in the Obi Softbody component, and adding volume sampling. However I'm still not achieving the desired effect. And the scenes runs at about 0.2 FPS. Any ideas what I should be doing differently?

(13-12-2021, 05:39 AM)benro Wrote: Of note, it loos like the softbody cube I'm using has almost 25,000 particles. This seems like WAY too much. Could this be part of the problem? I did not think the settings I used to create it were too egregious

(13-12-2021, 08:44 AM)josemendez Wrote: Hi!

Yep, 25000 particles is *way* too much. This will not only cause your simulation to run extremely slow, but it will also be pretty much impossible to get any accurate collision detection going on because particles will be really small.

You're using voxelization as your surface sampling method, with a resolution of 64 (!!). So 64x64x64 voxels will be generated, and the ones that intersect the cube's surface will be turned into particles. Some quick math tells you that will generate 64x64x6 = 24576 particles, give or take (each face spans 64x64 voxels, and there's 6 faces). Enabling voxel render mode in the blueprint editor makes this easy to see:



Your cube mesh only has 5x5 vertices at the top face, any additional particles will be wasted so there's absolutely no reason to go above a resolution of 5 in this case, when using voxel sampling. Even the default value of 16 would be too high. Alternatively, switch to vertex sampling.