RIVX CURVE STUDY / HOST EVALUATION → OFFICIAL RIVE DRAWING
A point moves. A whole strand follows.
Drag the mint points to edit the retained curve without Bézier handles. JavaScript evaluates the construction; official Rive draws the sampled paths. Compare dense gold and coarse coral sampling, then turn the same model into spatial strands.
WHAT THE EXTENSION KEEPS
Control points are the model.
RIVX adds the retained curve model: its construction, local fits and control points. Moving a point updates nearby spans without rebuilding a set of Bézier handles. This browser study ports that evaluator to JavaScript; it does not replace Rive’s renderer. The circular base represents circular arcs before display sampling.
The native editor keeps the curve family and points in its .rivx document. Here, the separate JSON saves those choices for the browser host. The loom lifts sampled curves into a procedural spatial arrangement to explore the same model in 3D.
WHAT ORDINARY RIVE RECEIVES
The drawing is still Rive.
The unmodified official Rive WebGL2 renderer draws every strand from narrow filled paths. Gold uses dense sampling; coral uses the selected budget. Their maximum sampled distance exposes approximation error. RIVX names the model and authoring experiment; official Rive is the drawing endpoint.
This .riv download stores the current drawing as filled quadrilaterals. The native editor’s spline export instead uses polylines; its Cubic Pen preserves true cubic Bézier vertices. These portable drawings keep their geometry, while editing the original interpolation rule requires the retained model and evaluator.
Construction adapted from this project’s native curve implementation, based on Cem Yuksel’s A Class of C² Interpolating Splines (2020). This browser port keeps the native quadratic parameterization, monotonic-angle guard and degenerate fallbacks; it does not claim every theoretical guarantee for those numerical variants.