It is simple and fast to setup: try this simple app Verve - http://www.taron.de/forum/viewtopic.php?f=4&t=4
To see grid just press G. Manual below.
There is no need to play with 1/2/3 perspective points separately and setup. User just rotates 3d cube and that is it. Simple and fast


[g] toggles visibility of the grid

Editing the grid:
[Ctrl]+[g] toggles editing of the grid
[LMB] dragging controls opactiy (can go positive and negative)
[Alt] + [LMB] free rotation
[Alt] + [RMB] horizontal rotation
[Alt] + [Shift] + [LMB] drag horizontal and vertical position of the grid along current rotation axis
[Alt] + [Ctrl] + [LMB] drag horizontal and depth position along current rotation axis
[Shift] + [LMB] drag horizontal and vertical camera axis
[Ctrl] + [LMB] drag horizontal and depth camera axis

Krita has a nice perspective grid engine to build pretty complex structures from planes.

But having abovementioned functionality would be great, of course. May I also suggest this video as an inspiration: both curved and orbital perspective engines would make industrial designers' lives much easier, not to say 'snapping to grid'.

P.S. If referencing other products the way I did is not allowed, I'm sorry. I only wish Krita the best =)

References other apps is allowed, though a generic "make it like Sai and Krita'll rock" or "if it ain't a pixel-perfect clone of photoshop, it'll suck" remarks tend to be bad for my blood pressure . But we don't have any trouble with nicking good ideas from other applications, if time permits.

As for perspective grids:

Shivaraman Aiyer is working on implementing this design: http://davidrevoy.com/article159/design ... ctive-tool
Here's his blog: http://shivaramanaiyer.wordpress.com/
And here's the branch -- but the work isn't done yet, sraman is still in the early stages: https://projects.kde.org/projects/calli ... shivaraman

I was really impressed with the perspective tools in the new Sketchbook Pro. It has really minimal visuals compared to most implementations.

Video demo of it (can you embed videos on this forum?)
http://www.youtube.com/watch?v=r96G15n0 ... 7A&index=1

xrg wrote:I was really impressed with the perspective tools in the new Sketchbook Pro. It has really minimal visuals compared to most implementations.

Video demo of it (can you embed videos on this forum?)
http://www.youtube.com/watch?v=r96G15n0 ... 7A&index=1

Oh hey, that's actually pretty nice.
There's, for some reason, not many applications that realise that you can mix one-point and two-point perspective just fine, but I guess it has to do with the more technical perspective drawing knowledge not being very wide-spread.

My personal gripe with many perspective tools is always the point where I go like 'all right, now I don't need to draw perfectly straight buildings', and then realising there's no easy way to go between snapping and not snapping. Krita has that sorta solved with the assistant-snapping value/check box. Now only if it's perspective assistant's vanishing points could be snapped to a horizon line, and we could hotkey that assistant checkbox.

But seriously, I got back into 3d because I figured it was easier to model things than to try and find a perspective tool that worked for me like traditional perspective drawing did.

Yeah, I like the assistant method Krita has, despite the perspective tool not being very practical at the moment. The ellipse assistant works pretty good though -- I think it could be improved a bit with allowing concentric circles like AZPainter or Manga Studio has, but otherwise it works better than a lot of other applications.

I find most perspective implementations tend to try to do too much of the work for you and wind up getting in the way more than help. For example, I freehanded the sketch below in Krita; when you get into things mildly complex it gets difficult to keep track of all those guidelines. So perspective tools that draw even more unnecessary grids and things kind of compound the visual clutter. It's why I like the way Sketchbook Pro is doing it. Instead of drawing a grid for you, it just shows you the angle on the cursor. It keeps out of the way a lot better than most.

To be fair though, Sketchbook Pro is geared specifically toward Industrial Design sketching. Krita is a bit more broad, and I suppose for freehand landscape painting like in the OP, a visual grid might be more useful.

I saw davidrevoy proposal and it seems to be to complex, cluttered imo. To much coverging lines at vanishing point, too much colors, it is hard too tell what is going where, lots of clicking to setup. Sketchbook seems very nice solution, clean, and not obstructing artist view on canvas. +1 to xorg, and in the and I guess the easiest way will be just take screenshoot from blender vieport

Good implementation, if we could add Horizon line snapping and simpler an a simpler vanishing point assistant, that would be great.

About perspective grid currently in development. I think the grid is meant to be used as a guideline, probably baked to a layer to use multiple grids. In this way I doubt it will have the assistant properties the "assistant perspective" has. So the assistant will remain as it is for the moment.

xrg wrote:Video demo of it (can you embed videos on this forum?)
http://www.youtube.com/watch?v=r96G15n0 ... 7A&index=1

Was anybody else watching that and thinking how great it would be if you could drag the vanishing points around and change the perspective of your drawing after you've drawn it...? And then, couple that with the upcoming animation functionality...

(c:

Chris Jones wrote:

xrg wrote:Video demo of it (can you embed videos on this forum?)
http://www.youtube.com/watch?v=r96G15n0 ... 7A&index=1

Was anybody else watching that and thinking how great it would be if you could drag the vanishing points around and change the perspective of your drawing after you've drawn it...? And then, couple that with the upcoming animation functionality...

(c:

...Said the 3d artist.

You do realise this is why we came up with 3d graphics in the first place, right

Of course - only on this occasion I was saying it with my 2D artist's hat on (ignoring the bit about animation for now). Too many times have I suffered the anguish of nailing a drawing, only to realise I've nailed it at just the wrong angle...

just a note. PS has now something similar to verves perspective cube http://www.youtube.com/watch?v=DuKoSuU_PZE#t=129

If I could throw my two new user pennies in here, I'd like to point out that Verve - which has some great coding behind those paint effects - is notoriously finicky about the hardware it runs on. Krita on the other hand runs on just about anything. A case in point is that view perspective trackball like feature in verve mentioned in the first post here, nice, but I prefer Krita - because it works on all my machines. For no apparent reason all the features of verve do not - the OpenGL on some of my cards is good for it and some aren't - and we're talking openGL 4.xx, not something ancient.