Rectangle

Each frame, Rectangle renders a fullscreen pass into its own offscreen Metal texture. The fragment shader evaluates a rounded-rectangle signed distance field (SDF) per pixel and converts the distance to the edge into smooth coverage. Because the shape is analytic, there is no polygon tessellation and no resolution dependence.

Coordinates follow the Grafit standard: origin (0,0) at the viewport center, shorter viewport edge mapped to [-1, +1]. X, Y, Width, Height, Corner Radius, and Border Width are all in Grafit units. Positive Rotation is clockwise, in degrees.

The shape is built in this order:

1. Base SDF — a rectangle of Width × Height, multiplied by Scale X / Scale Y, with corners rounded by Corner Radius, rotated by Rotation around its center.
2. Slice mask — if End Angle − Start Angle is less than 360°, an angular mask (the same one Circle 2D uses for arcs) cuts a pie-style slice out of the rectangle. Angles start at 12 o'clock (0°) and increase clockwise, rotating together with the shape.
3. Fill — when Fill is on, the interior is covered with Fill Color.
4. Border — when Border is on, a stroke of Border Width is drawn on top of the fill, placed per Border Mode. On partial slices with Rounded Ends on, circular caps (radius = half the border width) are placed exactly where the slice cut crosses the rectangle's border — the cap centers are found by ray-marching the SDF, so they sit correctly even on rounded corners.
5. Premultiply — output color is premultiplied (rgb *= a), the required format for generator textures.

Border Mode values:

Antialiasing uses the global AA multiplier; the node's Antialiasing toggle just enables or disables it for this shape. The drop shadow is a GPU post-process (geometry extract → separable Gaussian blur → tinted composite underneath the shape), not part of the SDF — and unlike Circle 2D, Rectangle's Shadow Size is functional, expanding the shadow silhouette beyond the shape before blurring.

The Width and Height outputs report the shape's bounding size in Grafit units, not the texture size:

Width  = Width × Scale X
Height = Height × Scale Y

The Image output is the full-viewport offscreen texture. When Enable is false, the texture is cleared to transparent.

Interactions: the SDF uses Width × Scale X and Height × Scale Y as the true size, so scaling and resizing are visually equivalent — but only Width/Height show up as the natural "size" while the scales are convenient animation targets. Corner Radius stays constant under scaling, so a stretched rectangle keeps its corner rounding.

• Audio level bars — Audio FFT → Array Get → Remap → Height on a column of Rectangle nodes for a classic spectrum bar meter.
• Progress bar — animate Width (or Scale X) from Timer or Counter via Remap; align the bar's leading edge by offsetting X by half the width with a Math node.
• Radial reveal / wipe — drive End Angle from 0 to 360 with Ramp or LFO to sweep the rectangle in like a clock wipe; add Rounded Ends on the border for a polished look.
• UI card with depth — rounded Corner Radius, subtle Border, and Shadow with a small offset and blur makes a floating panel behind Text as Image content.
• Pill badge — set Corner Radius to half the smaller dimension for a stadium shape; put a Text as Image node on the Canvas layer above it.
• Rotating frame — Fill off, Border on, Time → Math → Rotation for a spinning outlined square marker.
• Rectangular mask — feed the Image output into a Canvas node's Mask input to crop any other generator to a (rounded) box.

• Generators are invisible on their own — connect Image to a Canvas node; layers and blend modes are Canvas features.
• The Width/Height outputs (base size × scale) are ideal for driving a Canvas or aligning other nodes to the rectangle's footprint; they exclude border overhang (Border Mode 1/2) and shadow.
• For a perfect pill, Corner Radius ≥ half of the smaller scaled dimension; going beyond that just clamps to a capsule.
• Rounded Ends only affects the border at slice cuts; a full 360° rectangle ignores it.
• Shadows cost four extra GPU passes — turn Shadow off when it is not visible. Shadow Size + Shadow Blur with zero offset makes a soft ambient glow.
• Antialiasing quality is the global AA multiplier; the per-node toggle only opts this shape in or out.
• Related nodes: Circle 2D (same feature set for circles/arcs), Gradient (gradient fills to mask with this shape), Replicator (grids of rectangles without duplicating nodes).