VectorPaint watering-can sections: connect cavity, spout and outlet

English translation of the Chinese original, translated on 2026-11-12. Original publication dates, attribution, code and version notes are retained.

A long triangle attached to a body does not establish a spout connected to its cavity. Invent a side-sectional watering can with traceable fill opening, reservoir, spout passage and outlet. Wall thickness and liquid level are pictorial conventions, not manufacturing, sealing or water-flow predictions.

Choose a long-spout section without a rose

Use an 1800×1200 canvas with reservoir left and spout rising right, labelled a side-sectional diagram rather than an exterior photograph. Omit the rose for this exercise: its outlet is one opening, without claiming all cans lack roses. Haws’s parts information shows separately available roses on some products; this design adopts none of their exact structures or capacities. Separate body, wall, cavity, spout passage, handle and labels. Colour proves neither actual material nor pressure performance.

Define shell and cavity deliberately

Draw a rounded or roughly cylindrical exterior, then deliberately construct the inner boundary with visible side and bottom thickness. The fill opening interrupts the top wall so background reaches the cavity; a dark oval painted on a solid lid is insufficient. Reserve a connection in the sidewall for the spout instead of sealing a separate bottle and attaching a tube. Repair local wall contact rather than scaling the entire cavity and moving everything. Thickness may be exaggerated for clarity, explicitly without millimetre or real manufacturing claims.

Carry the passage through the sidewall

Form the spout passage between two edges, joining it to the lower or middle-lower reservoir according to this invented design. No intact sidewall may block the connection: an attached exterior can still hide a disconnected interior. In a checking copy, draw a pale route from cavity to outlet and verify that it stays in empty space. This is a manual continuity check, not a solved flow path. If the root seems embedded in solid material, repair inner/outer joins rather than painting blue over the blocking wall. Also inspect dark wall outlines against one background colour, without blue fill hiding a thin wall. The checking route need not remain visible, but you must identify its openings and show it crosses no wall, rather than accepting a can-like silhouette.

Put the outlet at the spout end

Extend the passage to a visible opening at the upper-right end with a thin rim. It may taper but must not close into a sharp point, which would seal the cavity. An elliptical end suggests a viewing angle; label transitions between sectional and exterior fragments rather than showing a solid rear wall while claiming a full interior view. Check for an unintended transverse blockage. Before removing it, distinguish it from a needed far rim so wall-thickness information survives.

Separate liquid indication from handle identity

Optionally mark a pale horizontal liquid level ending at the inner walls and label it schematic. Do not slope the liquid surface merely to fit the rising spout. This task calculates no flow, pressure or discharge condition, and blue colour proves no passage continuity. Put the handle behind/above the body, attached to solid body areas rather than passing through the spout. Its opening is exterior background, not reservoir. If handle and fill opening become ambiguous, adjust view or position to retain separate boundaries instead of merging them into one hole.

Change one condition in a sealed-spout example

In a checking copy, add only a transverse wall at the spout root and label it blocked. Exterior, colours and outlet remain unchanged, demonstrating that a visible spout need not connect to the reservoir. Remove the false wall and restore both passage edges; moving the entire spout away creates another gap. Keep the incorrect copy out of the valid export and use it for no drilling demonstration. A separate closed-tip error is possible, but name the two controls independently so each repair addresses a known continuity failure.

Check exported cavities before decoration

Hide liquid colour, highlights and text, then manually trace empty space from fill opening through reservoir and spout root to outlet. A route crossing a wall requires object repair; insufficient contrast requires value adjustment before topology changes. Save the editable source and open a PNG to inspect wall thickness, outlet and handle background. Hide ordinary drawn checking lines deliberately. Test another background so openings remain distinguishable beyond white, and retain the sectional label to prevent the diagram being mistaken for a complete exterior view.

Troubleshoot openings and continuity

A solid-looking can suggests cavity-fill trouble; a detached spout suggests root joins; an unintended leak suggests outlet placement; extra handles may be highlights or shadows. Retrace empty space after repair rather than accepting smoother outlines alone. Retain fill opening, reservoir, spout passage, outlet correspondence and blocked example. All lines are manual, with no verification of real level, capacity, flow or sealing. This exaggerated section supports no heating, cutting or drilling of a real container; its result is a clear static vector depiction of one selected structure.