Paint Eraser
I know it's already been requested a few times, but with the new Convert-to-Painting tool I think it's a good time to reiterate why an eraser-like feature would be very much needed.
During the preview stream there was a lot of emphasis on how we can use the paintings as low cost background assets, but that's kind of misleading. Unlike sculpts, all paintings on screen will render even if they're obscured by other paintings. Because of how the new tool works, the entire surface area of the sculpt is made to paint, so any non-visible parts of the painting are wasted since it'll still affect performance and thermo. You'll see a lot of "noise" as more paint flecks on screen reduces LoD. Too many flecks on screen will cause paintings to flicker and can cause performance issues; too much will force VR users into cinema mode.
The only way to prevent the performance issues is to place a sculpt inside the painting so there's a physical object to obscure the paints, but then that sort of defeats the initial purpose of converting it for a background asset. An eraser would help immensely by allowing us to delete sections that we don't need anymore; and, of course, would be a very nice addition to make painting and drawing more fun.
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Paint Eraser: On the topic of the post as in the title... that would be useful.
For now, try using the looseness tool in "volume brush" mode and "reduce looseness" mode. This lets us reduce the size of painting flecks that are inside the box. We can lower the size of them so much they're not even visible. When they're that small they should have no impact on overdraw/performance. Likely they wouldn't be rendered at all, as they're so small on the screen.
The other comments as they pertain to a Paint Eraser tool: I was thinking it would be good to be able to remove the "back side" of a sculpt to say you don't need those flecks to be included or something, particularly for the kinds of cases where you turn distant bg objects into paint. This would save a tiny bit of graphics as there are fewer flecks, and a tiny bit on performance/overdraw (it's likely at most 2 flecks on top of each other with the back side there, vs 1 fleck with the back side not there, so probably not a huge deal).
But it's not going to be a huge deal on that front unless people just make everything in their scene paint... which they can already do and can already have performance issues resulting from it and can already need to deal with by changing things. I don't think this tool introduces any new issues to the engine.
The other comments: Sculpts will also render if they're obscured by other paintings. Objects won't render if they're obscured by sculpts; maybe that's what you meant. And for background objects like in the example, if they're sculpts, they won't be obscuring anything as they're in the background. So it wouldn't make much difference in this case anyway. Things closer to the camera probably shouldn't all be made into paint; them being sculpts helps cull stuff in the background so they don't need to be rendered. Managing that stuff has always been in the hands of the creators, so I don't think this tool introduces any problem. We just have more options, and more functionality for creation.
As those flecks are far away anyway, they're smaller on the screen, which means they'll be rendered at a lower LOD anyway. LOD doesn't make things more flickery though, to my understanding. They're just rendered as more blobby-looking versions of the flecks. Less-opaque flecks look more noisy and flickery; not lower-LOD flecks. So if you don't lower the opacity of those paintings you should be good.
Mm weren't saying people should turn everything into paint and have no performance issues. They were using this as an example where we can same graphics thermo by not just reducing the detail of the sculpts, but turning them into paint. That will change how they look, it will change how they affect performance, etc. just as changing anything about your scene will affect how things look and how they affect performance.
If it causes problems in your scene, or you don't like how it looks or anything like that... press the undo button, or don't use the tool in those cases. You do you :D
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