QuickSDFTool v0.3.0-preview

This preview release focuses on the 0-90 to 0-180 symmetry workflow, generated SDF preview reliability, and timeline toolbar polish.

Recommended Audience

Technical artists authoring toon-shadow threshold maps in Unreal Engine 5.7.
Teams using separate left/right UV islands who want to avoid painting both halves manually.
Users testing the generated SDF material preview and material-slot based workflow.

Item	Status
Unreal Engine	5.7.4 tested development target
Platform	Windows development environment
Project type	C++ Unreal project
Shader model	SM5 or higher

UE 5.6 and earlier are not supported for this preview.

Added UVIslandChannelFlip90 for generating the 90-180 side from island-local mirrored 0-90 data.
Added island mirror data storage on texture sets, plus chart coverage handling and warnings for ambiguous or unpaired islands.
Kept final island-channel output shader-compatible with normal 0-180 threshold maps.
Fixed island-channel mirror direction so self-paired islands flip horizontally, not vertically.
Fixed channel packing so final export uses the expected R/A/B/G swizzle while preserving the historical B-channel behavior.
Fixed UVIslandChannelFlip90 G/A output order.
Added generated SDF material preview mode and auto-preview handoff after successful generation.
Fixed Material Slot row selection in the custom details UI.
Removed the obsolete Shadow paint overlay toggle and its unused icon/property path.
Tightened timeline layout by reserving fixed width only for angle numbers, keeping toolbar buttons stable without wasting header space.
Updated English and Japanese README files with symmetry mode behavior, channel layout, shortcut changes, and verification notes.

This release targets UE 5.7+ only.
The old Shadow quick toggle has been removed. The quick-toggle shortcuts now run from Alt + 2 through Alt + 8.
UVIslandChannelFlip90 writes RGBA16F / HDR-compatible output even in Monopolar mode; it does not use grayscale-only G16 output.
Existing bSymmetryMode assets continue to migrate to the matching enum mode on load.
For island-channel symmetry, large UV shape mismatches, overlapping islands, out-of-range UVs, and unpaired islands can produce warnings and fallback behavior.

Run the automation groups:

Automation RunTests QuickSDFTool
Automation RunTests QuickSDFTool.Core
Automation RunTests QuickSDFTool.Core.Timeline

Enter Quick SDF mode and select a mesh with multiple material slots.
Select rows in Material Slots and confirm the active slot changes.
Generate SDF with Off, Texture Flip, and UV Island Channel Flip, then inspect the generated texture channels.
In UV Island Channel Flip, confirm 90-180 channels are generated from island-local horizontal mirror sampling.
Confirm the generated SDF preview mode can display the newly generated threshold map.
Confirm the timeline header and key angle labels stay stable for 1-, 2-, and 3-digit angles.
Confirm the obsolete Shadow toggle is absent from the timeline toolbar and quick-toggle menu.

UV layout can affect the relationship between brush size and painted area.
GPU JFA shader files exist, but the public generation path currently uses the CPU FSDFProcessor path.

QuickSDFTool-v0.3.0-preview-Win64.zip: packaged plugin build for Windows / UE 5.7.4 testing.
Source archive generated by GitHub from the tag.

Compare with the previous preview: https://github.com/yeczrtu/QuickSDFTool/compare/v0.2.0-preview…v0.3.0-preview