# positiveEdgeInset The distance from each positive edge (+X, +Y, +Z) of the clip bounds over which opacity fades to 0, expressed in local coordinate space units. ``` var positiveEdgeInset: SIMD3 ``` ## Discussion Values range from `0.0` to the half-extent of the bounding box on each axis. For example: - `0.0` means no feathering on that edge. - An inset distance value of `2.0`on X axis creates a 2-unit feather zone inward from the +X edge. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)