Add Lattic to Grease Pencil Drawing

Grease pencil Box deform

Blender addon - Modal that create temporary deforming rectangle around selected GP points.

Note : Since Blender 2.91, Box deform is integrated in the official addon Grease Pencil Tools bundled in Blender. You just have to activate it.

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Youtube Demo

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Description

I first created this as a prototype following my request post : Cage deform active tool for grease pencil

Turns out this works really well as it is, so I added some shortcuts for usability and voilà !
Developed for Grease pencil, (mesh might be supported in the future.)

Example with lattice subdiv and spline deformations.

How to use: (same tutorial in addon preferences)
Use the shortcut Ctrl + T in available modes
The lattice box is generated facing your view so be sure to face canvas to avoid unintentional anamorphosis offset
Then use following shortcuts (also displayed in topbar):

Modes and deformation target:

• Object mode : The whole GP object is deformed
• GPencil Edit mode : Deform Selected points
• Gpencil Paint : Deform last Strokes

Shortcuts (also displayed in topbar):

• Spacebar / Enter : Confirm
• Delete / Backspace / ctrl+T / Tab(twice) : Cancel
• M : Toggle Linear and Spline mode at any moment (disable autoswap on first use)
• 1-9 top row number : Shortcut to subdivide box
• Ctrl + arrows-keys : Subdivide the box incrementally in individual X/Y axis

Notes :

If you return in box deform after applying with a ctrl+Z, you need to hit ctrl+T again to revive the modal.

A cancel warning will be displayed the first time you hit Tab (to avoid mis-canceling)

Multiframe edit selection works but you will only see the current frame during the modal

Todo:

• Find a way to detect other modal to use ESC key for cancelling when only one running
• target meshes

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Changelog:

0.2.5 - 2020-06-23:

• fix: paint mode deforming strokes on another layer
• fix: force view overlay during modal to avoid losing sight of lattice
• feature: autoswap mode between Linear and Bspline
• UI: preference checkbox to disable new autoswap feature
• code: refactor, deleted useless property group

0.2.4 - 2020-06-20:

• fix : Disable 'ctrl+Z' shortcut during modal (avoid crash when undoing in)

0.2.3 - 2020-06-17:

• fix : Bug when a layer has no frames (prevent scanning frameless layers)
• UX : Silent cancel if not GPencil object or wrong mode is used

0.2.2 - 2020-06-09:

• fix : Paint mode, use bottom stroke when using 'draw on back' option
• fix : Paint mode, scan strokes from active layer only

0.2.1 - 2020-05-26:

• fix : correct multiframe edit bug

0.2.0 - 2020-05-26:

• Feature : Allow other modes, Object deform whole GP object, GP Paint get the last stroke
• Feature (fix) : possibility to relaunch the modal after returning in lattice edit with ctrl+Z
• UX : temporarily enable release confirm for more natural control
• UX : temporarily lower mouse/tablet drag threshold for more responsive control when moving points
• syntax : renamed ops

0.1.2 - 2020-05-25:

• fix : right depth, apply matrix_world to GP point coordinate

0.1.1 - 2020-05-23:

• first stable version

Add Lattic to Grease Pencil Drawing

Source: https://github.com/Pullusb/Box_deform

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