The text one looks like it may be taken too (by Gail).

Yes, I am planning now to concentrate my efforts on this. I'm even working on a text bug as we speak ;)

Gail

From MAILER-DAEMON Sat Mar 24 12:49:46 2007

Date: Sat, 24 Mar 2007 20:49:45 +0100 From: Thorsten Wilms <t_w_@...123...> To: inkscape-devel@lists.sourceforge.net Message-ID: <20070324194945.GB4642@...1413...> References: <46055F5C.4020403@...173...> <20070324185647.GA4642@...1413...> <3c78ff030703241206y1a44bc8clb41f9885c63337b@...401...> MIME-Version: 1.0 In-Reply-To: <3c78ff030703241206y1a44bc8clb41f9885c63337b@...401...> Priority: normal X-Mailer: Mutt User-Agent: Mutt/1.5.13 (2006-08-11) X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by sourceforge.net. See http://spamassassin.org/tag/ for more details. Report problems to http://sf.net/tracker/?func=add&group_id=1&atid=200001 Subject: Re: [Inkscape-devel] Illustrations for a planned 3D box tool (SoC) X-BeenThere: inkscape-devel@lists.sourceforge.net X-Mailman-Version: 2.1.8 Precedence: list Reply-To: t_w_@...123... List-Id: <inkscape-devel.lists.sourceforge.net> List-Unsubscribe: https://lists.sourceforge.net/lists/listinfo/inkscape-devel, mailto:inkscape-devel-request@lists.sourceforge.net?subject=unsubscribe List-Archive: http://sourceforge.net/mailarchive/forum.php?forum=inkscape-devel List-Post: mailto:inkscape-devel@lists.sourceforge.net List-Help: mailto:inkscape-devel-request@lists.sourceforge.net?subject=help List-Subscribe: https://lists.sourceforge.net/lists/listinfo/inkscape-devel, mailto:inkscape-devel-request@lists.sourceforge.net?subject=subscribe X-List-Received-Date: Sat, 24 Mar 2007 19:49:46 -0000 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Content-Disposition: inline

On Sat, Mar 24, 2007 at 03:06:55PM -0400, bulia byak wrote:

The text explains it: "doubleclicking on one of the green PLs, which places the VP at the location where the click occurred"

Oops :)

...

The 2nd image is wrong, anyway, I think. The viewpoint would be above the box, as the top is shown slightly from above. The bottom must be farther away, then. So the VP for the vertical edges would be below, not above the box.

I don't see anything wrong with this one. It's an unconventional perspective but it's built according to the rules.

The perspective is either impossible or it's not a box, so much is obvious for me. Now let's see ... the drawing is below the horizon, you can see the top, that means you look down on it. If you look down, the 3rd vanishing point must be below.

Needs a nadir, not a zenith. http://www.khulsey.com/3_point_perspective.html

But perhaps allowing such weird stuff makes things easier in the end.

We don't yet have the notion of horizon at all, at least at this basic stage. Any pair of VPs can be taken to represent a horizon.

The horizon is important. Take several boxes with non-parallel side walls as example: their VPs have to be on the same horizon.

...

as the user will likely care more about the box. Because if you draw on paper, using construction boxes/lines, at least one VP would be far away from the paper in most cases.

So what? In Inkscape you can always zoom out as far as you need and still drag it freely.

My point was not about a technical limitation, but the common practical approach to drawing in perspective: you draw a box and the VPs remain in your imagination only. The angles of the edges step into the fore- ground.

When you drag a corner, you change the size/proportion of the box but its perspective (i.e. VPs) remains the same. When you drag the VPs, you change perspective but the box size/proportions remain the same.

Hmm. I wonder if you can keep proportions and perspective apart at all, if you have no movable camera and no projection from a reference.

First image, if I drag the lower front corner, do I change perspective or proportions?