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How to apply 3D fx on a curve that isn't closed without strange artifact?


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I'm probably phrasing this incorrectly, but, here goes:

I'm looking to have an odd-shaped curve that I want to have filled with a color and have the line black. However, I don't want the two end points of the curve to be connected by a straight line - I want just the curve and its nodes to be lined and filled. Then, I'd like to apply the 3D fx to it. My issue is that along the unclosed line between the start and end points, I'm getting an odd artifact. I've tried applying a transparency gradient to eliminate the odd section, but it's not very effective. Any thoughts? Is there some kind of setting or tweak that I can change or do? Please see attached image for the example I'm talking about.

 

 

Example Closed 3D fx gradient artifact.png

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55 minutes ago, Old Bruce said:

Here is a hacked solution. Uses a curve to cover the open area.

test.afdesign

Instead of covering the open area, you can close the curve and then clip it to a rectangular mask that hides the unwanted part.

Test-clip.afdesign

Alfred spacer.png
Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro
Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.4.1 (iPad 7th gen)

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Place guides at both ends of the form.
Duplicate the shape, remove the "3D" fx from the copy and reduce the length of the copy (bring the edge to the flat part of the original shape).
In the layers, nest the shape with relief in the one without relief.
Resize the general shape to the original dimensions using the guides.

2020-07-23_191628.jpg

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