Negative Overlay

[Gioreva]

Hi
How can I draw Negative Overlay?

Black is Overlay.

I don't think we can make negative gherber.

[ddavidebor]

You can create a polygon, then use one of the convert tools on your shape (under tools-->create cutout from select primitives) to create a cutout on that polygon.


For the text, there is an option to make it negative if you select "truetype"

Another option is to draw it in a software like autocad, explode it,  then create polygons once imported in altium.

Another option, you can draw it positive then invert the gerbers in postprocessing.
Still, the last one, draw it positive and tell the fab house to invert it.

[Gioreva]

Tanks.

I can't import DXF, only rectangles or circles appear, but the numbers don't appear. (Number = Curve)

I'm trying the first option, but text are not recognised as primitive.

I create poligon Pour
I place True Type Text, Inverted or not.
I select both
(v19) Tools -> Convert -> Creates Poligon from selected Primitives.
>>>> Could not find closed shape using primitives centerline due to the following error:
>>>> At least 2 connected traks/arc or full circle required

If I create rectangle using line, select rectangle and text.
(v19) Tools -> Convert -> Creates Poligon from selected Primitives.
It creates it without errors, but the text is not subtracted.

[luismh]

Maybe this thread can help you
https://www.eevblog.com/forum/altium/invertnegative-of-a-gerber/

[T3sl4co1l]

Still another option: generate SVG, load SVG into a TTF font file e.g. with glyphter.com then place a string with that character on the board.  Size as needed, set inverted.

Tim

[Gioreva]

I can ask the supplier to reverse, but the online prototypes are not very helpful, it's all automatic.

You can create a polygon

ddavidebor  help
Ma sei Italiano ?

I read the post, but it's not for me.