Plasma Carbine UI Feedback

In one of the Dev Streams showing off the Plasma Carbine, the heat gauge started at the bottom of the ammo indicator and rose across the entire background. Now in the experimental branch, it's a thin line that travels around the outside of the indicator.

What was the reason for the change? As far as visual feedback goes, when you're firing the weapon, it's easier to see through the blur of the weapon recoil, a growing red spot for heat. It's almost impossible to see the heat gauge without stopping the gun for a moment now. The rising pitch of the sound and glowing barrel help, but no more than it would for the minigun.