<div dir="ltr"><div><div><div>Sorry, the ellipse's horizontal component needs to be aligned to the horizon of that particular plane.<br><br></div>There's a thread here which goes into the complexer details: <a href="http://www.conceptart.org/forums/showthread.php/273023-creating-a-perfect-square-in-perspective">http://www.conceptart.org/forums/showthread.php/273023-creating-a-perfect-square-in-perspective</a><br><br></div>Resize your toolbox: there's a bug where it doesn't allow you to click transform when crop isn't touching the toolbox border.<br></div>For the line-tool, it's supossed to be laggy, as it takes your tablet sensors into account. Tick 'preview' in the tool box to get a quicker previewing line.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 25, 2015 at 10:42 AM, Brendan Scott <span dir="ltr"><<a href="mailto:disposableemail@apps.opensourcelaw.biz" target="_blank">disposableemail@apps.opensourcelaw.biz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">[resend with attachment removed and hosted at <a href="http://www.tiikoni.com/tis/view/?id=bfd5b0a" target="_blank">http://www.tiikoni.com/tis/view/?id=bfd5b0a</a>]<span class=""><br>
<br>
On 25/04/15 00:59, Wolthera wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I see.<br>
<br>
The reason the vanishing point assistant was set up the way it was is<br>
because of the way I understand perspective: All parallel lines share a<br>
single vanishing point, and making the horizon is actually a lot easier<br>
than you'd think: Just turn on snapping and draw a line from one vanishing<br>
point to the other. (Though shift+snapping is on my todo list for the<br>
parallel lines :) )<br>
<br>
As far as I know I wasn't eyeballing the distances: You can check these by<br>
drawing diagonals, and maybe I haven't drawn enough diagonals in the video<br>
itself. It was my third take or something, but I did take into account the<br>
diagonals.<br>
<br>
But, in regards to that link: let me make your life a whole lot more easy:<br>
A perfect circle in perspective is always an ellipse. An ellipse in<br>
perspective in turn becomes an egg-shaped ellipsoid. What's more, any<br>
perfect circle fits perfectly in a perfect square. What this means is that,<br>
if any given perfect circle is an ellipse, we can draw our lines around it,<br>
then we have a perfect square! I'm attaching an image with this in Krita.<br>
Sounds a lot easier than following that link's guide for a perfect square<br>
each and every time, doesn't it?<br>
</blockquote>
<br></span>
I'm sorry. I don't follow. If I have a length that I want to transfer from<br>
one axis to another, I don't see how an ellipse will help.<br>
<br>
For example, assume that you _only_ have edge G (and the two vanishing points<br>
and vanishing lines) in the attached image.<br>
<br>
How could you use an ellipse to create edge A or E (and therefore implicitly C/B/D/F)?<br>
In particular, there are multiple ellipses which are tangent to both vanishing lines.<br>
Even if I put one of the axes of the ellipse passing through both the the centre of G<br>
and (when extended) through the vanishing point.<br>
<br>
See: <a href="http://www.tiikoni.com/tis/view/?id=bfd5b0a" target="_blank">http://www.tiikoni.com/tis/view/?id=bfd5b0a</a><br>
(expires in 28 days)<br>
There is no basis for distinguishing between the ellipse on the left hand side of edge G and that on the right hand side. Is there?<br>
<br>
This is my use case:<br>
<br>
At the moment I'm trying to draw a person in perspective and I want to do the<br>
perspective properly basically to try to train my eye for the right perspective<br>
proportions.<br>
<br>
The person I want to do has "heroic" proportions - which means they're 9 heads<br>
tall and 2.66 heads across their shoulders. The length of the head is the yardstick.<br>
I am doing them from waist to head, so I need to map out a prism: 4.5 heads<br>
high, 2.66 heads wide (ie across shoulders) and 1.4 heads deep (roughly front of chest to<br>
back of backside).<br>
<br>
I did this on a piece of paper then scanned it into Krita. I'd like to do it<br>
natively within Krita.<span class=""><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Similarly, you can use the perspective transform to deform any given<br>
imagine to a perspective plane(you can even drag around the vanishing<br>
points in the perspective transform for precision).(This isn't cheating,<br>
Krita isn't a videogame)<br>
<br>
You can use the distance measure tool to measure pixels. In the future I<br>
hope to get a concentric circle assistant working, which you could then use<br>
to draw a perfect circle around each vanishing point so you don't have to<br>
go and measure things.<br>
</blockquote>
<br></span>
Yeah, I think my build didn't work properly. That block of tools (crop, move,<br>
transform, measure) doesn't work for me. My line tool is also laggy.<span class=""><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I hope this e-mail doesn't sound flippant, but I want to make your life<br>
easier, or at the least bearable till I have time to work on the assistants<br>
again. :)<br>
</blockquote>
<br></span>
Not at all, but unfortunately I don't follow your explanation.<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature">Wolthera</div>
</div>