LightBurn Demo 18 – Trim / Extend

The Lightburn Software Series

The Lightburn Software is probably the best generic laser cutting software available (I use it for almost all of my laser work). This series has tutorials, hints and tips as well as the occasional speed comparisons between it and RDWorks. My thanks to the team at Lightburn for allowing me to embed their videos. This session concentrates on the Lightburn Trim Extend Features.


A quick walk through of the Trim and Extend functionality for node editing in LightBurn.

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Lightburn Trim Extend Features
Lightburn Trim Extend Features

Transcript for Lightburn Trim Extend Features

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0:00one of the more frequently requested

0:02features in light burn has been the

0:04ability to edit a path within relation

0:07to other shapes and paths in your own

0:09design now in other software that may be

0:12called something like scissors or snip

0:13but in light burn it will be part of the

0:17node Edit functionality so we’re going

0:20to know that it mode and as you can see

0:21here only this one Square has nodes that

0:24can be manipulated that is just simply

0:28because these other shapes have not been

0:31converted to path so this is just a

0:32quick reminder you can go back into

0:33selection mode right click and choose

0:36convert to path now that we go back to

0:38no data mode you can see all of these

0:41shapes have nodes that can be

0:43manipulated in this case let’s say that

0:45I want to remove this corner out of the

0:47square and I want it to basically just

0:50cut everything from this intersection

0:52point to this intersection point now

0:53that is what the node edit trim

0:55functionality is specifically for I can

0:58hover over these paths hit the T button

1:00on my keyboard and as you can see it’s

1:02found this intersection and this

1:04intersection and removed everything in

1:06between there it’ll basically fan out in

1:09both directions from the point in that

1:11you were hovering on over the path this

1:13also works with curves on the outside

1:18and on the inside and will even work on

1:21something like this where the

1:22intersection is really just on or very

1:25near the line but not actually crossing

1:28the path so I can do that this also

1:31works with more complicated curves like

1:33this Bezier curve that has an actual

1:35self intersection right at this point I

1:38can remove this here and I can even

1:40remove the path on this side as you can

1:43see it finds this intersection and then

1:45the self intersection up here and

1:47removes it from there and you’ll notice

1:49that the control points on curves will

1:51move about as these trims happen but

1:56note that the curve itself is not

1:58actually changing shape it’s just that

1:59we’re having to subdivide the curve and

Video Transcript for Lightburn Trim Extend Features (Cont…)

2:01remove everything else which will change

2:03the control points now this will even be

2:08smart enough to if you have a design

2:09like this now this looks like this

2:12actually intersects or

2:14comes very close to it and it does come

2:16very close but does not actually touch

2:18if you zoom in you can see that here

2:21it’s not actually touching the line

2:22we’ve made it however to be smart enough

2:24to infer that visually this looks like

2:27it’s intersecting so you can still do a

2:29trim with no problem so that brings us

2:32to the last little bit of extra function

2:35honor that we’ve added onto the trim

2:36which is extend so in this case let’s

2:40say we go back to these shapes and I’ve

2:42got this square that I’ve trimmed off

2:44but now I want this path to go from here

2:47up to the top easy enough you just hover

2:49over any node that is a termination

2:53point to the past so like this node for

2:55example would not work because it it

2:57would not be able to infer which

2:58direction you want to go but on this one

3:00I can hover over this node hit the e key

3:03and it’s gonna find the nearest

3:05intersection along that sort of

3:07imaginary path and then extend the line

3:09to that point this also works with

3:11curves so let’s take this one and we’ll

3:13move it out and just for examples sake

3:17I’m gonna move out this control point

3:18you’ll see why in a second so if I click

3:21on this ending node and hit E again

3:23that’s going to extend it but in the

3:25case of curves it actually adds a new

3:27line as opposed to extending the

3:29existing line and that line is extended

3:32along the slope of the control point so

3:36that’s really all for the treatment

3:37extend functionality this should be in

3:40the next release of light burn and we

3:43hope you all liked it thanks Protection Status Follow @laseruser_com