Oval perspective - Need help

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dgsarnow
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Joined: Thu Feb 21, 2008 4:41 pm

Oval perspective - Need help

Postby dgsarnow » Fri Aug 29, 2014 6:13 am

I am trying to recreate the following shape from scratch. I am looking to do that because the shape is a little out of balance. It's small but it matters to me. I have two challenges:
SVG Image
  1. I know how to use the perspective tool to make the oval "tilt" but I do not know how to make the stroke at the top thinner than the bottom to give that illusion of distance.
  2. I do not know how to cut the paths to recreate the grooves. I know I could create a white quadralateral to place in each groove to create the illusion, but I actually want to cut them out so I can use the as an overlay if I want to.

Are any of you able to help me?

Thanks,

David

hulf2012
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Joined: Sat Nov 24, 2012 12:37 pm

Re: Oval perspective - Need help

Postby hulf2012 » Fri Aug 29, 2014 7:46 am

Hello,

I think you should take a lookt to the perspective extension:

http://tavmjong.free.fr/INKSCAPE/MANUAL ... erspective

Greetings
If you have problems:
1.- Post a sample (or samples) of your file please.
2.- Please check here:
http://tavmjong.free.fr/INKSCAPE/MANUAL/html/index.html
3.- If you manage to solve your problem, please post here your solution.

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McRoth
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Re: Oval perspective - Need help

Postby McRoth » Sat Aug 30, 2014 1:24 am

1. Maybe making a blue ellips, with no line, then duplicate it (Ctrl+D) and make that one white. Make the white one smaller with the selection tool.
2. If you have a blue path and some white on top of it, select them both and go to Paths > Difference. Then you have them cut out.
Repeat those steps for the next grooves.
In the middle a blue ellips.
Then select all blue parts and make them one Path: Path > Unite.
I am new here, still learning how to add the svg file. So I upload it as an attachment.
ovals or grooves.svg
three grooves and an ellips in the middle.
(3.56 KiB) Downloaded 211 times


The three white stripes you can then place on top and again use Path > Difference to cut.
Inkscape 0.91 and 0.92.4. Writing a course about this beautiful program.

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brynn
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Re: Oval perspective - Need help

Postby brynn » Sat Aug 30, 2014 1:46 am

I know how to use the perspective tool to make the oval "tilt" but I do not know how to make the stroke at the top thinner than the bottom to give that illusion of distance.


The Perspective extension automatically makes the back line thinner than the front. Kind of like magic! So you don't have to worry about that part.

If you made the original target shape like McRoth suggested, then you need to select it, and one of the quadrilaterals (which must be on top), and then do Path menu > Difference. Do that 3 times, once with each quadrilateral. If you made the original target shape differently....well it depends on how you made it. If you run into trouble, let us know how you made the original target shape, and we can tell you how to proceed from there.

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druban
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Re: Oval perspective - Need help

Postby druban » Sat Aug 30, 2014 9:04 pm

1. The perspective extension only transforms geometry. Your stroke is not geometry but STYLE. To get the effect you want, do stroke to path for all strokes before calling the perspective extension.

2. The Boolean difference command will cut a bottom shape with the top shape. But In this case too you should use a closed filled shape, not an open stroked line.

#. The easiest way to do this is to draw a single stroked arc, Duplicate it twice, rotating 120 in between, select them all, duplicate twice again, scaling in between, and the select them all and do a stroke to path. Then draw the circle.
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