MP Curve Exposure

Merged Scripts:

Tweak for Curve Exposure by A.Evseeva: Pick the end or start ( with ALT) of curve exposure by mouse click
Change Anchor Point of Curve by SimplSam: CTRL+click on a point to change first vertex

VIEWPORT CHANGES:
- Hold SHIFT while dragging to preserve exposure range
- Double click outside a shape to reset exposure
- CTRL+click inside a shape to select curve. CTRL+SHIFT add shape. CTRL+ALT subtract shape.CTRL+click outside a shape to deselect all
- Double click outside a shape to reset exposure

NEW TOOLBAR FUNCTIONALITIES:

- Keyframe both values. Always write start and end values on keyframes
- Lock range. preserve exposure range on both viewport and input fields. Allows you to offset by a precise value
- Flip to end. Set end point to start and expose to 100%
- Flip to start. Set start point to end and expose to 0%
- Reverse range. Mirrors values
- Reset exposure
- Live Markers. Enabling will write MP_SyncMarkersLayer in Utility folder if not present and load that into the layer. Create markers to display which value is set on the keframe: S for start, E for end, B for Both. For multiple shapes selected displays n/total. S if only start values are present, E if only end values are present. B if both values are present. M if shapes have mixed start, end values. Markers are tied to keyframes (you cannot drag them), if you move a keyframe corresponding marker will follow.