- blends from current weight into alpha zero. - uses brush alpha & curve. - respects weight paint vertex/face select modes. - updates realtime. Access With - Alt+LMB (linear gradient) - Ctrl+Alt+LMB (radial gradient) note: - WM_gesture_straightline_* are used but not well suited to this task, may end up replacing with own modal operator. - Key handling works but needs to be done better.