VectorPaint stencil bridge studies: connect internal islands to surrounding material

English translation of the Chinese original, translated on 2026-11-04. Original publication dates, attribution, code and version notes are retained.

Cutting an entire ring can leave its interior as a detached island. Use an original ring-letter mark to study how retained bridges connect that island to surrounding material. This examines 2D connectivity and recognition, without treating white cover shapes as real holes or guaranteeing any material, tool or production size.

Define retained and removed regions first

Create an 800 by 800 pixel canvas and define light as retained material and dark as proposed removal in a legend. Build a ring-like glyph concept with a large circle and smaller concentric circle: a light inner circle and dark ring. Layered fills can communicate the concept but are not yet a real compound cutting path. Identify outer material, inner island and ring so their meanings follow the legend. Use an original simple design rather than treating protected font outlines as unrestricted production material. Understand the isolated island before adding bridges.

Trace whether the island is disconnected

Without a bridge, try tracing a route from any point in the inner island to the outer retained material while staying in light areas. A continuous dark ring blocks it, indicating isolation regardless of whether the island looks centred. This is manual reading of a colour concept, not an assumed connectivity-analysis button. Keep circle edges clear so accidental overlap cannot make an island seem connected. Save the unbridged baseline for comparison. With more complex glyphs, list every enclosed island; fixing the most obvious opening does not establish that the entire glyph can be retained.

Draw bridges in the retained-material colour

Place a narrow light rectangle across the ring, extending into both island and outer material. Start at a clearly visible top or side location and test width relative to this drawing rather than giving an unverified universal minimum in millimetres. Colour overlay communicates retained material conceptually; it does not automatically cut the dark path underneath. Keep bridge, island and exterior independently selectable. If two bridges are desired, establish one connection first, then add the second and compare recognition and structure. Do not add numerous symmetric strips until the ring is unrecognisable.

Balance bridge placement and recognition

Compare a top bridge with a diagonally placed bridge in an independent copy, keeping width fixed, and ask which better preserves the intended ring-like glyph. Placement can suggest another letter, number or symbol, so judge against the intended use rather than assuming thicker connections are always better. This does not assess physical strength, which also depends on thickness, fibre and process and requires separate validation. Examine two-colour geometry before decoration. A bridge touching another contour creates additional connectivity that must be explained, not treated as an automatically beneficial accident.

Separate the visual mockup from actual path requirements

For explaining the principle, keep the colour concept and clear legend. For cutting, establish actual removal boundaries in the receiving tool’s supported workflow and inspect holes, bridges, closure and duplicate lines. Do not deliver this layered illustration as a finished production file. SVG or PDF extensions do not prove correct toolpaths, and white objects do not automatically mean retained material. Confirm required structure and units with the actual producer before working in a separate copy. Retain the concept source to check that path processing has not changed the intended design.

Remove a bridge to test the reasoning

Hide the only bridge in a test copy and try tracing from island to exterior again; isolation should return. If a route remains, inspect hidden bridges or overlapping objects. Restore the bridge and follow the entire light route, checking both ends for tiny real gaps. Repeat for every island instead of relying on a complete-looking overall silhouette. This establishes connectivity in the two-dimensional representation, not resistance to breakage in paper or other materials. Retain a check record distinguishing intentional connections from those still needing fabrication samples.

Label delivered artwork as a bridge concept

Save the unbridged baseline, bridged version and legend. At actual export size, check bridge visibility and labels around critical areas. Test transparent output on other backgrounds: a light fill may remain a real object rather than material-free space. Include the retain/remove convention when discussing fabrication to avoid reversed interpretation. Name concept and revision and manage production files separately. Reopen the delivery image and check that hidden bridges, test fills and ambiguous boundaries have not been unintentionally included. Any small-size simplification needs renewed connectivity checks rather than an assumption that reduction preserved the bridge.

Inspect bridge endpoints when islands remain disconnected

For an apparent bridge that still leaves a gap, inspect both endpoints entering the island and exterior, then dark objects covering it. If many bridges impair recognition, retain necessary routes and remove irrelevant symmetric decoration. Questions about double cutting lines require inspection in the real receiving tool, not visual assurances from this concept. A purely visual illustration needs no invented physical-performance conclusion. After repair, separately confirm connectivity, recognition, legend and intended use. The concept becomes useful for further discussion when it accurately explains which areas are retained.