ohif-viewer/platform/docs/versioned_docs/version-3.9/migration-guide/3p8-to-3p9/6-RTSTRUCT.md

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---
id: 6-rtstruct
title: RTSTRUCT
sidebar_position: 6
---
# RTStructure Set has transitioned from VTK actors to SVG.
We have transitioned from VTK-based rendering to SVG-based rendering for RTStructure Set contours. This change should not require any modifications to your codebase. We anticipate improved stability and speed in our contour rendering.
As a result of this update, viewports rendering RTStructure Sets will no longer convert to volume viewports. Instead, they will remain as stack viewports.
Read more in Pull Requests:
- https://github.com/OHIF/Viewers/pull/4074
- https://github.com/OHIF/Viewers/pull/4157