A BlinkScript-driven utility designed to extrapolate and pad cropped ST maps beyond their original bounding boxes.
STMap Extension
First submitted: 29 April 2026
Author: Marty Blumen
Website: https://www.martyblumen.com/
Compatible Nuke versions: 14.0 or later
Compatibility: Source
ST Map Overscan
Description: A BlinkScript-driven utility designed to extrapolate and pad cropped ST maps beyond their original bounding boxes.
Standard UV pipelines often break down when lens distortion maps or baked UV passes are heavily cropped or fail to cover a required overscan area. This tool places the source ST map into a new, larger format and mathematically synthesizes the missing UV coordinates outside the original boundaries.
Core Features:
Format & Positioning: Defines a new output format. The source map can be automatically centered within the new canvas or manually offset via X/Y pixel controls.
Extrapolation Modes:
Linear (Default): Calculates the per-axis slope of the outermost pixels and projects the gradient outward. This maintains the trajectory of lens distortion or surface UVs into the padded region.
Clamp: Repeats the outermost pixel values (standard edge extend behavior).
Zero: Fills the extended area with
[0, 0]values.Fade: Generates a linear falloff from the edge values down to zero based on the padding distance.
Edge Smoothing: A critical control for
linearmode. It averages pixel samples tangent to the bounding box edge before calculating the outward slope. This prevents microscopic input noise or aliasing at the crop line from being multiplied into infinite streaks across the extrapolated area.
Technical Notes:
Bbox Aware: The internal BlinkScript kernel reads directly from
src.bounds. Any upstreamCropnodes will be strictly respected as the extrapolation boundary.Lens Distortion: When extending real-world lens maps, keep the Edge Smoothing parameter modest (8-16 pixels). Excessive smoothing will average out the mathematical curvature required at the edges of the lens.
Performance: Fully GPU-accelerated via an
ePixelWiseBlinkScript kernel. No compiled NDK plugins required.
Installation: Simply copy and paste the provided code directly into your Nuke Node Graph, or save it as a .gizmo or ToolSet within your pipeline environment.
OpenSource:
https://github.com/bratgot/STMapExtension
MIT License
Copyright (c) [2026] [Marten Blumen]
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