Hi Dead_Morose,
Unfortunately, I do not speak Russian, so hopefully any translation needed will be easy to understand.
- Right now Mass is has a bug that will not allow it to be set for a Destructible Actor. This has been reported with UE-5642.
As a workaround you can create a Physical Material and in its properties you can change the Density to a higher value. You can then assign this Physical Material to a Material that you can assign to your Destructible Actor.
This seems to work well in most cases, but I believe there are still some issues that users have reported where this will not solve all the mass issues with the Destructible.
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The valid bounds that you have set up are really high. So with 500,000 units that would be equivalent to 5000 meters or 5 kilometers. It would be better to use much lower values and then scale up as needed. You can also use the Max Separation in flag and set the bounds there in place of using the valid bounds as well.
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For your last question, The issue here will be that since you have 1000 fractures for your mesh the chunks will be really small. The property you will need to adjust is the Large Chunk Threshold. This can be found by selecting the mesh in your level and in the Details panel you will find it under Destructible Component tab.
By default the Large Chunk Threshold is set to 25, which would be too large for a small chunk that would be created by making a 1000 chunks from that sized wall.
You did mention that you wanted the larger chunks to stick together, so with that you would want to set the Support Depth in the Destrutible Actors settings to be 1. This will allow the chunks to only break free when they receive enough damage to do so. Depending on how you’re applying damage to your Destructible you may need to adjust some other damage properties for Impact Damage, Damage Spread, or Damage Threshold.
I hope this helps.
Tim