Affinity Designer for MAC doesn't output sized object correctly

[PapaBear60]

I've used Adobe Suite for years, but got tired of paying their $50+/month tax just for the use of AI and Photoshop.  I've spent thousands.  Then found Affinity and use Photo a lot, and hoped that I could use Designer in lieu of AI for an often needed feature.  I create objects for output to a laser printer/cutter/engraver.  The problem is that when I save the object as .svg and output it to the laser, it changes the size.  The attached picture illustrates this.  I have two objects created exactly the same way in AI and AD.  Both are 3" x 3" and use 0.25 points for the lines.  The output from AI is exactly 3" x 3".  The output from AD is a little more than 1/16" larger than the 3" x 3" as can be seen here.  This makes AD entirely useless for my needs and I must now go back and grovel to Adobe.

 

[v_kyr]

In the generated SVG file check with a text editor the width, height and viewBox value settings of these and adjust them if needed.

[PapaBear60]

Not sure what that does for me - must I do it with every .svg I produce?  How do I change it, because this is what is there now:

<svg width="100%" height="100%" viewBox="0 0 5850 3450"

And, the two .svg files (AI and AD generated) look entirely different.  There is a place, when drawing one of the box lines where the AI text file shows a size of 216 x 216, which for 72 dpi would be 3", but there's nothing like that in the text from the AD .svg file.

[v_kyr]

The way SVG is generated by Affinity sometimes leads to a zoomed preview in webbrowsers. Thus look if the removale of the width/height percentage setting does change that behavior. There is also a more option for SVG export which affects this for the viewBox. - Other than that you have to see if sizes are possibly differently setup.

[PapaBear60]

OK, here's the thing.  I've been playing with all the option boxes and settings around SVG and more.  Nothing seems to affect the output which is larger than it should be.  Affinity Designer either has this capability or it does not.  If it does, it shouldn't be so difficult to find.   So, I'm suspecting it doesn't have it and so far no one can tell me differently.  While I appreciate your responses, it is clear that you don't know either and, frankly, it's a waste of my time and yours to try to brainstorm this thing through a forum.  Thanks anyway, but I'm looking for concrete answers - has anyone had success getting AD to output objects of the correct size????

[v_kyr]

It's hard to tell just from the shown images, if you can attach the example AD and generated SVG files of AI and AD here, we can possibly take a closer look and make an inspection of those. - Note further that Affinity's SVG engine output/export is by no means perfect, which you can easily see if you search the forum here after certain similar SVG issues. - So it always depends!

[PapaBear60]

Here are the SVG files from the two software packages.

Not sure what's hard to tell from the picture.  Two laser prints, one from each AD and AI, with a 1/16" scale out to 3".  One is 3" (AI) the other (AD) not so much.  Off by 4% or so, not even close to a reasonable margin of error.

I realize SVG is crap on AD.  I'm trying to get these examples back to them to review.  I hate it when a software company builds such barriers to communication.  Where should I post this in hopes that someone from Affinity will see it.  Right now, AD, as interesting as it is, is totally dysfunctional for anything but art, IMHO.

Dave

TestSVGfromAffinityD.svg

TestSVGfromAdobeI.svg

[v_kyr]

Hmm the SVG doc sizes and graph sizes in pixel differ a lot here:

Adobe AI SVG

Doc:  612 x 792 px, 72 DPI

Rect x: 198 px,
     y: 288 px,
     w: 216 px,
     h: 216 px

 

AD SVG

Doc: 5850 x 3450 px, 72 DPI

Rect x: 763.3 px,
     y: 903.2 px,
     w: 900 px,
     h: 900 px

    

[PapaBear60]

OK, just by way of comparison, I took the adobe file and opened it in Affinity, then re-exported it as an SVG again.

This is what I got, but the only conclusion is that they're screwing with the parameters for no apparent reason.

 

TestSVGfromAdobeThruAffinity.svg