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The 3D Warehouse tools by Cadman provide a suite of tools to Quality Check your models for managing and reviewing SketchUp models prior to uploading those files to 3D Warehouse.
Create and edit various kinds of advanced Bezier surfaces from Bezier curves, arcs, circles and lines
Intelligent snapping and detailed part list with price
Fake ambient occlusion inside SketchUp.
by DBS
Extension allows to rotates view around specified element.
Suite of tools for working with imported map data to generate buildings and stepped terrains.
Subdivision, sculpting, and soft selection tools
Auto magic dimensions Sketch-up plugin. Automatically add dimensions easily to your drawing with a click of a button.
Automatically softens and smooths autofolded edges.
A tool to create B-Spline curves that pass through user selected data points