Do I need 2 normal maps to solve this issue? I want my character to flex his Bicep, when he does, veins should show up, but only when activated.
The problem I have is the normal map is already used for all the other details of my character.  If I put the veins in, they'll be static.
Is there a way I can clip the veins on ONLY when he flexes?  How would I approach this?
Thanks for your help!
You could use a BW mask the turn normals on/off locally.
Use the Strength input of the Normal Map node.
Then just animate the BW mask.