# VectorPaint envelopes and inserts: align the pocket, flap and occlusion

Language: en
Canonical: [VectorPaint envelopes and inserts: align the pocket, flap and occlusion](<https://allluckly.cn/en/guides/vectorpaint-envelope-insert-pocket-occlusion/>)
中文：[中文 HTML](<https://allluckly.cn/guides/vectorpaint-envelope-insert-pocket-occlusion/>)
English: [English HTML](<https://allluckly.cn/en/guides/vectorpaint-envelope-insert-pocket-occlusion/>)
Published: 2026-11-09T00:00:00+08:00
Modified: 2026-11-09T09:37:10+08:00
Author: Bison

Draw pocket, insert and flap separately, checking insertion depth and open/closed states through visible boundaries without claiming a physical paper pattern.

English translation of the [Chinese original](<https://allluckly.cn/guides/vectorpaint-envelope-insert-pocket-occlusion/>), translated on 2026-11-09. Original publication dates, attribution, code and version notes are retained.

A rectangle with a triangle does not necessarily identify an envelope opening. Make three static views—open, card inserted and flap closed—tracking pocket edges and the hidden part of the card. All composition is invented, with no cutting pattern, bonding instructions or postal-size approval, and no automatic folding or animation tool required.

## Establish the pocket and an explicit opening reference

Create a canvas with a pocket outline400 wide and260 high, beginning with a horizontal opening reference. Its upper-left/right corners are the flap-root endpoints, not card corners. Keep pocket, flap and card as separate identified objects, deferring stamps, addresses and shadows. Dimensions are exercise units, not physical millimetres. Preserve a three-component outline view for later opening checks rather than prematurely merging similarly coloured parts into an uninspectable object.

## Attach the open flap to both opening endpoints

Draw the open flap above the opening, with its base endpoints matching both opening ends and its apex upward. Different pale fills reveal a detached corner, a base cutting through the pocket or a flap attached to the card instead. This is the rear flap raised, not an extra unexplained triangle. Round its apex with minimal node edits if desired while preserving root endpoints. You maintain those connections manually; grouping does not understand a fold, so moving the opening requires rechecking them.

## Draw the complete card before inserting it

Set the card340 wide and220 high, leaving60 total width clearance or30 on each side. Draw it completely outside the opening first, with an original short heading rather than private correspondence. In the inserted view expose80 and hide140, retaining total height220 instead of shortening the card. Its bottom remains inside the pocket. A transparent checking copy can show the complete card; the presentation uses front-pocket occlusion. Do not mix both into an unexplained transparent view.

## Keep front fold seams distinct from openings

Optional front seams may run inward from side corners, indicating joined paper rather than transparent cuts exposing the card. They belong to the front-pocket layer and must not move with card text. Change to a dark background to detect background-colour patches. If using such patches to conceal the card, identify a fixed-background illustration requiring rechecking after background changes, not a true cut-out. Available masks or visible segments may suit better, but inspect actual output without assuming universal complex-mask compatibility.

## Hide the card before closing the flap

Duplicate a view, first placing the whole card inside with its top no higher than the opening, then show the flap downward over the front while retaining both root endpoints. Closing over a still80-unit-exposed card suggests it is trapped outside the fold and is not this exercise’s closed state without separate explanation. Keep the pocket fixed rather than turning the whole envelope upside down. These are hand-built outlines, not verified 3D fold projection or paper-thickness behaviour.

## Compare three states against the same pocket

Align open-empty, partially inserted and flap-closed states by the pocket’s lower-left corner, preserving equal outlines. Identify visible/hidden components instead of merely labelling a view “done”. Verify80+140=220 in the partial state and a wholly enclosed card in the closed state. A two-view presentation may omit open-empty while retaining that baseline for checking. Move card text with the card, without moving pocket seams or flap. Inspect card-only selection so its objects are identifiable without dragging the whole illustration.

## Inspect the opening and stray text after export

Save the editable source and open a viewing-size PNG independently. Inspect hidden card text leaking through the pocket and white gaps or doubled strokes at flap roots. Ignore shadows initially and check whether three component outlines explain depth. Hide manual opening references actively if unwanted; their names do not prevent export. If another format differs from the PNG, simplify occlusion incrementally in a copy while preserving the source rather than overwriting or deleting the complete card. Readable actual output completes the visual check.

## Check component ownership before decoration

For an apparently cut card inspect complete height and occlusion; for a floating flap inspect both root endpoints; for visible text in the closed view check full insertion rather than darkening shadows. If seams move with the card, repair grouping instead of locking the whole drawing to avoid the issue. Preserve the complete-card check, three states and actual output, attributing every visible edge. This is an original insertion/occlusion illustration, not a cutting die or automatic assessment of physical foldability.

## Related tutorials and sources

[VectorPaint mask exercise: keep a pattern inside a circular window](<https://allluckly.cn/en/guides/vectorpaint-masks/>), [VectorPaint folded leaflets: verify cover, inside and back with a paper mockup](<https://allluckly.cn/en/guides/vectorpaint-folded-leaflet-order/>).

Checked on November 9, 2026: VectorPaint public version 1.0.8, requiring iOS / iPadOS 17.0 or later. Capability scope follows the [official App Store listing](<https://apps.apple.com/cn/app/id1587272880>) and [Apple public version lookup](<https://itunes.apple.com/lookup?id=1587272880&country=cn>). This is an original exercise to perform independently; use controls in your installed version. Manual construction and external records do not imply new automatic analysis features. No step-by-step physical-device, private-file or all-output-environment testing is claimed.