According to this guide, showing how a glowmask is applied to dropped items, it is not easy to add a glowmask to "weapons being held" in the current version of tModLoader. However, this library makes it easy for developers to add a glow mask to their items. Simply add the GlowMaskAPI.dll file to your references. And add modReferences = GlowMaskAPI to your build.txt...
Below is an example of how you...
GlowMaskAPI - A library to help you easily add a glowMask to your items
Below is an example of how you...
GlowMaskAPI - A library to help you easily add a glowMask to your items