CAD Drawing Redlines
CAD redline markups annotate a drawing to indicate an error or suggest an amendment. There are two primary triggers for redline markups.
Project revisions: When a drawing is in the project/construction phase, it will often undergo several revisions before it is finalised with an as-built status. Redlines provide a convenient method for drawing reviewers to suggest changes to a drawing.
Operations and maintenance: In real-world scenarios, such as on-site surveys or general maintenance work, errors in drawings can be discovered. CAD redline markups offer a practical solution in such situations, allowing these errors to be highlighted and triggering a revision update on the drawing to rectify the issue, thereby maintaining the integrity of the drawing.
When drawings are uploaded to Lunr, a few files are generated in the background:
A thumbnail to support quick previews.
A PDF rendition to enable viewing in the browser and redline markups.
An OCR content file to allow users to search for text inside drawings.
Markups are securely stored against the PDF rendition, enabling easy review on the web. Access to redline markups can be controlled using securities, ensuring only authorised users can view and create them. Typically, read-only users will not have access to redline markups, instead, they will only see the latest as-constructed drawing file, maintaining the integrity of the drawing review process.
When drawings are released from document workflow, markups are kept with the current document version, meaning the new as-constructed version does not include the markups from the previous version.
