PathOfBuildingCommunity / PathOfBuildingCommunity/PathOfBuilding

Elemental Penetration support cannot support active skills from items in PoB, but can in game

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bug: calculation
Dominant language
Lua
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Description

Check version
  • I'm running the latest version of Path of Building and I've verified this by checking the changelog
Check for duplicates
  • I've checked for duplicate open and closed issues by using the search function of the issue tracker
Check for support
  • I've checked that the calculation is supposed to be supported. If it isn't please open a feature request instead (Red text is a feature request).
What platform are you running Path of Building on?

Windows

What is the value from the calculation in-game?

In-game, Elemental Penetration support can support active skills from items.

What is the value from the calculation in Path of Building?

In Path of Building, Elemental Penetration support cannot support active skills from items.

I believe this is because "Elemental Penetration" is tagged as "fromItem = true" even though there is a way to obtain it as a real support gem:
https://github.com/PathOfBuildingCommunity/PathOfBuilding/blob/7984c8f532f88a6d0b4f9d70346fde7f2c7cc9ed/src/Data/Skills/other.lua#L1279

And there's some special casing to avoid having support gems from items affect active skills from items:
https://github.com/PathOfBuildingCommunity/PathOfBuilding/blob/7984c8f532f88a6d0b4f9d70346fde7f2c7cc9ed/src/Modules/CalcTools.lua#L93-L96

How to reproduce the issue
  1. Add any item that grants an active skill, and can be supported by support gems (for example, "Relic of the Pact").
  2. Add "Elemental Penetration" as a support in that item's sockets.
  3. Observe that "Elemental Penetration" is listed as "Cannot apply to any of the active skills".
Character build code
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Screenshots

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First steps

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  4. Open a pull request that references the issue number.

Research direction

Start with the Elemental Penetration definition in src/Data/Skills/other.lua around line 1279 and the item-support handling in src/Modules/CalcTools.lua around lines 93-96. Reproduce the issue with an item-granted active skill such as Relic of the Pact and Elemental Penetration in its sockets. Done means the support is accepted for eligible active skills from items, matching the in-game behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
lua
Domain
backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Clearly specified
Newbie friendliness
68/100

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