Material parameter collection issue

Development Asset Creation
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1

Hi,
when changing a scalar parameter value using blueprints form a material parameter collection, the change works only if only one parameter is set.

Workflow : create a NewMaterialParameterCollection
add a scalar parameter
use a blueprint to change this value using “set scalar parameter value” node (target kimset material library)
see the change at runtime
add another parameter in the collection
the previous change or a new one (with the new parameter) don’t work anymore

is that a known issue ?
I didn’t find anything about this in the forums.

2

Also the collection doesn’t work anymore even if I delete all “new” parameters and let only the first created.
The issue persists if the collection is created with many parameters before using them in the materials.

3

This issue does still exist in UE 4.16. A workaround is to restart the editor, then it will re-compile all materials that use the MPC.