SUMMARY *** A Windows painting app Jugipaint (available on Steam) has a 3d cube guide. The UI for it is a little bit obtuse (first you need to create a guide layer, which is a type of layer in Jugipaint, called Perspective Guide, then fiddle with the numbers to move the walls of the cube closer/further away from the point of view, then use the (a bit deceptively named in this case) "Move Tool" while the perspective layer is selected, but I believe it could be adapted for Krita. The guide takes a form of inside-out cube (normals flipped inside) that can be resized and rotated by the user, with grid on every wall of it a brush can snap to. It looks somewhere like this: https://i.imgur.com/u0Ti9TW.png It is essentially a guide to end all guides as the user can rotate the cube at will and also scale it/change grid density on each face independently. While this can be (kinda) approached in Krita by using Perspective guide, the results often are wonky (see https://i.imgur.com/9mOPGcX.png ) and even if you can line it perfectly, Perun help you, if you want to change the angle of the shot (which may be needed for animation). *** STEPS TO REPRODUCE None, it's a suggestion. OBSERVED RESULT No such guide, at least not with the power of Jugipaint's one exist currently in Krita. EXPECTED RESULT Such guide exist in Krita. SOFTWARE/OS VERSIONS A suggestion. The OS/hardware info aren't important for this one. ADDITIONAL INFORMATION I love cute kittens. Add one to the splash.
Thanks for your suggestion. I'm currently working on assistants, and there are many requests for different kinds of perspective-based assistants. There is no way to implement all of them. Please join the discussions on Krita Artists forum so one consistent plan can be formed. Topic about Perspective grids specifically: https://krita-artists.org/t/lets-make-perspective-grid-more-useful/44181 Topic about assistants in general (including all perspective-like assistants): https://krita-artists.org/t/planned-changes-to-assistants-coming-in-2022-or-later/43064 From your request I caught one thing I haven't thought about which is usefulness for animation. I added it as item F155 on my spreadsheet with all assistant requests, but note that this is something that will probably take plenty of time before it can be implemented.
This assistant is basically the only kind of assistant you'd need as it can be rotated and changed in dimensions. I strongly recommend getting Jugipaint just to see how it works there, it isn't free, but it is relatively cheap on Steam (windows-only though). I'm afraid I simply can't do it justice using words alone. It makes assistants like Krita's perspective guide, or even 2 point perspective guide basically obsolete, it's that good.
From your description, it doesn't sound that good, it sounds pretty limited. Only one type of perspective, and only one corner at a time. You admit the controls are inconvenient to use. You compare it with current Krita's Perspective but remember that there are plenty of other potential new perspective assistants that can be implemented like the Lazy Nezumi rulers - https://lazynezumi.com/perspective and https://lazynezumi.com/vanishingLines . In which ways Jugipaint is better than them? (That's not a rhetorical question, to make assistants as good as possible, it's best if I know advantages of different approaches). And have you read the list of improvements I plan for assistants and the Perspective one in particular? Do you think that adding a todo item to make an easy way to change a set of Perspective grids would make it on par with Jugipaint? (Also note that 2pp assistant already have this feature).
Again, I don't think I do it justice with my description. I'm not a native English speaker so I blame it on that. Basically that tool can give you any perspective you want since it's basically a 3d cube you can rotate around (and move the walls of it if you need something to be further or closer to the point of view). As for the controls, those could be streamlined for Krita. Again, I strongly recommend getting it and trying it out for yourself to see how it work. A little bit of it is shown in the Jugipaint's trailer here: https://www.youtube.com/watch?v=1OLpjOvHUeU It is much better than anything Krita has, including the 2 point perspective assistant.
Okay, so apparently Photoshop had a similar thing (apparently removed), though without snapping (or the guy in the video didn't had snapping on): https://www.youtube.com/watch?v=vIueh7LjofQ Now imagine this, but with snapping, you can rotate it any way you want meaning that you could get any perspective you want. No more fiddling with 2point/perspective assistants, just rotate the 3d grid and get any perspective you need.