To access newly created parameters in a Material Parameter Collection via the Set Scalar Parameter Value or Set Vector Parameter Value nodes, you must reassign the Collection to the node.

Also Reproduced in Main Promotable-CL-2487422

Steps to Reproduce
  1. Open QAGame Editor
  2. Create a New Material Parameter Collection with one Scalar and one Vector Parameter
  3. In the Level Blueprint, off of Event Begin Play add a Set Scalar Parameter Value and Set Vector Parameter node
  4. Add the Collection created earlier
  5. Back in the MPC, add another 3 to 4 Scalar and Vector Parameters
  6. Save the MPC
  7. In the Level Blueprint, Compile

RESULTS: You will only have access to the originally created Parameters in the node drop-down until you reassign the MPC in the Collection input

EXPECTED: When you re-Compile the Level Blueprint, I would expect that the BP would update information from the MPC automatically.

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Cannot Reproduce
ComponentUE - Gameplay - Blueprint
Affects Versions4.
CreatedMar 23, 2015
ResolvedMay 2, 2019
UpdatedMay 3, 2019
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