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I defined PWR and GND layers as planes in layer stack manager. When I want to draw polygon in PWR or GND layer, a placed polygon looks disabled as in the picture. How can I enable the placed polygon plane in Altium Designer?

enter image description here

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  • \$\begingroup\$ what tool are you using? Eagle, KiCAD, ... ? \$\endgroup\$
    – Neil_UK
    Dec 27, 2021 at 6:59
  • \$\begingroup\$ I am sorry . I am using Altium Designer \$\endgroup\$
    – user295040
    Dec 27, 2021 at 7:02
  • \$\begingroup\$ I’m not an Altium expert but I think that if you define a layer as a plane then you don’t need to draw a polygon, you’ll get the full area of the PCB less any keep-outs or apertures for vias on different nets. Check the gerbers to be certain. \$\endgroup\$
    – Frog
    Dec 27, 2021 at 8:34

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If you specify a layer as a plane, it changes how that layer behaves:

Power planes are created in the negative. Objects placed on the power plane layer become voids in the copper; the remaining regions will become solid copper.

Thus, when you place a polygon on a layer defined as a plane, you're actually creating an area where no copper should be present.

For more information, see Defining & Managing Copper Areas for a PCB in Altium Designer.

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