There ain't no bevel edges.

[richmond62]

While one can add shadows and inner and outer glows to controls, there seems no obvious way to add a bevel edge:
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SShot 2023-11-16 at 10.37.35.png (24.18 KiB) Viewed 2280 times

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Faked with the help of GIMP.

Of course, if you are happy with a static image-as-button that is not a problem at all (just knock together the image in an external graphics program); but if you want something scaleable . . .

[richmond62]

Some wag suggested the third 'thing' here was a bevel:
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SShot 2023-11-16 at 11.39.59.png (6.9 KiB) Viewed 2266 times

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https://forums.livecode.com/viewtopic.php?t=32132

But it isn't: it is just a silly arrangement of colours round a button border.

[richmond62]

And why, "sugar-my-kneecaps", did it take me about 22 years to learn about miterLimit?

AND . . . what exactly is the point of miterLimit as it seems to have no visible effect on a graphic?
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SShot 2023-11-16 at 11.52.01.png (21.81 KiB) Viewed 2264 times

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"The miterLimit is used to calculate the maximum size of a miter join before it is rendered as a bevel."

Aha: so where is the bevel?

[stam]

Not quite sure what you mean by 'bevel edge' as this (and things like mitering) really only applies to 3D constructs.

Do you mean simulating this so that a 2D object has a pseudo-3D appearance? (most HIG's go against this as the current trend is for 'flat' interfaces).
Or do you mean mean rounded corners?

For pseudo 3D, you can achieve a bevel effect with combination of innerShadow, innerGlow and optionally fillGradient (as seen in the 2nd graphic below).

I always use graphics as they have adjustable roundRadius. The image below is with a roundRect graphic with effects applied within LiveCode.

[richmond62]

Those look pretty good, Thanks!