Graph editor

The graph editor (the Curve window) is what sets SineVFX apart. It drives any numeric channel with a smooth bezier curve over the effect's lifetime, with an optional envelope for randomised spread - far beyond Roblox's coarse number-sequence keypoints.

Open it from any graph-capable channel in the Properties window.

Reading the graph

• The horizontal axis is time - 0 at the left (particle birth / start of a play) to 1 at the right (death / end).
• The vertical axis is the channel's value, clamped to that channel's min/max range.
• Anchor points define the curve; the line between them is what the value actually does.

Editing the curve

• Drag an anchor to move it in time and value.
• Add an anchor by clicking on the curve; delete the selected one with the Delete button (or right-click).
• Bezier handles - each anchor has tangent handles. Pull them out for smooth, eased segments; collapse a handle to zero for a straight (linear) segment.
• Right-click an anchor to reset it; handles can be flipped 180° for symmetric shaping.

A segment with zero-length handles is linear; give the handles length and it becomes a curved segment, sampled smoothly for playback.

Envelopes

An envelope is a symmetric band around the curve - value ± spread - that randomises each particle within that range for natural variation (think flickering transparency or varied sizes). Toggle the envelope on and drag its band; it's clamped to the channel's value range so it never overshoots. Set spread to zero and every particle follows the curve exactly.

Range controls

The button row lets you set the channel's Min, Max, and Envelope range, plus toggle Curve and Envelope modes. The view auto-fits to include the full curve and any envelope spread when you reload, so you always see the whole shape.

Where the data lives

Bezier curves are stored on the instance (as attributes), so they persist across sessions and travel with the effect when you copy it. Reopening the editor restores the exact curve you drew.

Tips

• Keep the Emit window running while you shape a curve - you'll feel the difference every handle makes.
• Use envelopes sparingly; a little spread reads as "alive," a lot reads as "noisy."
• For sharp pops (impact flashes), use near-vertical linear segments; for soft fades, pull the handles long.