Make files you can reuse.
- Stored height channels, slope strength, box smoothing, inversion and Wrap or Clamp.
- Actual Height and +Y Normal previews, illustrative movable light, and a 2×2 tile check.
- Both Y normal PNGs, processed height, light study, unchanged original, PDF proof, CSV measurements and restorable source-backed JSON — nine files in one ZIP.
- Twenty local projects, eight treatments each. Explicit save, reopen, rename, duplicate and delete.
PNG only: static non-interlaced 8-bit gray/RGB/gray-alpha/RGBA, 8–1024 pixels per side, 12 MB. Source bytes use no gamma/ICC conversion; Luma is weighted code values. Generated normals are numeric opaque RGBA8. Import as non-color/linear and test Y direction in your destination. Wrap does not remove seams. Lighting is illustrative; no measured geometry, AI inference, mesh baking or engine certification.
Support
Email maga40@naver.com with your iOS version and the affected action. Do not send private source images unless you choose to. For unsupported PNGs, export a static non-interlaced 8-bit gray or RGBA PNG within the limits. Save a project before closing; restore a shared Project.json through Files.
Privacy policy
Effective October 3, 2026. Gobling Company does not collect data from Slopefoil. The app has no account, analytics, advertising SDK, tracking, cloud sync or developer-server upload. Sources and project controls stay in local app storage. A project JSON includes its source bytes; sharing a project or ZIP sends those files to the destination you choose through Apple's share sheet. External support links open your browser or mail application under their own privacy practices.
Delete a saved project to remove its retained source. Temporary output copies can remain in app storage until system cleanup or app removal. System device backups follow your iOS settings. Up to 200 MB retained sources. No personal data is requested from children. Contact maga40@naver.com for policy questions.
Terms
Use only images you are entitled to process and share. Slopefoil provides illustrative height derivatives and lighting, not measured shape or physical materials. Verify bytes, normal orientation, dimensions and destination import settings before production use. One purchase unlocks the entire app; no in-app purchases. Apple's standard licensed application terms apply.