If your SketchUp model contained any geometry before the import, the imported CAD geometry is grouped automatically.
Make sure the CAD geometry is a single group.If the size is incorrect, the Tape Measure tool also enables you to scale the entire model so that the dimensions are correct. Choose an entity with a measurement you know and check its size with the Tape Measure tool ( ). Check the size of the imported CAD geometry.Here's a recommended workflow for getting an imported CAD file ready for modeling in SketchUp: For details about installing extensions, see Adding Extensions to SketchUp This extension can clean up terrain and CAD files for you by simplifying curves and closing gaps. If you need to use your CAD geometry, however, check out the Edge Tools 2 extension by user ThomThom. If you've imported a floor plan, for example, drawing over a floor plan to create a new model is easier than hunting and pecking to find and fix all those gaps.
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Also, imported CAD geometry is likely full of gaps that need to be closed to create faces. When in doubt, re-creating the model with SketchUp's native drawing tools typically produces better and more consistent results than trying to manipulate the imported CAD geometry. Tip: Why use the CAD file as a reference? The main reason is because CAD geometry is often way too complicated to create a useful SketchUp model. Whether you've never worked with a CAD file imported into SketchUp before or have lots of experience importing CAD files, the tips and examples in the following sections can help you quickly start modeling with your file in SketchUp. Hunting down all these little gaps can be tedious - unless you know a few tricks explained in this article. The lines in an imported CAD file often don't connect to form SketchUp faces.(See Importing and Exporting CAD Files for details about matching the units.) This is especially true if you weren't sure what unit of measurement was used to create the CAD file. The size or scale may not import correctly.Here are the known issues that you may find after you import a CAD file into SketchUp: Importing and exporting common CAD file formats has always been part of SketchUp's DNA, but CAD files imported into SketchUp do have a few known quirks that you can sidestep if you know the tips explained in this article. The attributes can be changed with the Attribute tool.Like many SketchUp users, you may want to use your CAD files to create excellent, useful, and lightweight SketchUp models. Blocks with the attributes set to “By Block” will initially adopt the attributes assigned to the layer.The block’s attributes will change if the layer’s attributes are changed. Blocks with the attributes set to “By Layer” will adopt the attributes of the layer they are inserted in to.The block needs to be edited to change any of the attributes. color set to blue, width set to 0.18 mm, etc) will retain those attributes when inserted into a drawing. In addition to the specific attributes, pen attributes (Color, Width, Line Type) also include “By Layer” and “By Block”. Pay particular attention to the Attributes when creating blocks. Generally layer “0” should only be used when creating blocks and should be the only layer in a drawing for a block. More importantly in the context of blocks, it is equivalent to “no layer”, similar in the way that color “By Block” is equal to “no specified color” or line type “By Block” is equal to “no specified line type”.
It is the default layer for new drawings.