Edges and Faces: Thats all there is to it 
Every SketchUp model is made up of just two things: edges and faces. Edges are straight lines, and faces are the 2D shapes that are created when several edges form a flat loop. For example, a rectangular face is bound by four edges that are connected together at right angles. To build models in SketchUp, you draw edges and faces using a few simple tools that you can learn in a small amount of time. It's as simple as that.
Push/Pull: Quickly go from 2D to 3D 
Extrude any flat surface into a three-dimensional form with SketchUp's patented Push/Pull tool. Just click to start extruding, move your mouse, and click again to stop. You can Push/Pull a rectangle into a box. Or draw the outline of a staircase and Push/Pull it into 3D. Want to make a window? Push/Pull a hole through your wall. SketchUp is known for being easy to use, and Push/Pull is the reason why.
Accurate measurements: Work with precision 
SketchUp is great for working fast and loose in 3D, but it's more than just a fancy electronic pencil. Because you're working on a computer, everything you create in SketchUp has a precise dimension. When you're ready, you can build models that are as accurate as you need them to be. If you want, you can print scaled views of your model, and if you have SketchUp Pro, you can even export your geometry into other programs like AutoCAD and 3ds MAX.
Follow Me: Create complex extrusions and lathed forms 
You use SketchUp's innovative, do-everything Follow Me tool to create 3D forms by extruding 2D surfaces along predetermined paths. Model a bent pipe by extruding a circle along an L-shaped line. Create a bottle by drawing half of its outline, then using Follow Me to sweep it around a circle. You can even use Follow Me to round off (fillet) edges on things like handrails, furniture and electronic gadgets.
Paint Bucket: Apply colors and textures 
You can use SketchUp's Paint Bucket tool to paint your model with materials like colors and textures.
Groups and Components: Build smarter models 
By "sticking together" parts of the geometry in your model to make Groups, you can create sub-objects that are easier to move, copy and hide. Components are a lot like Groups, but with a handy twist: copies of Components are related together, so changes you make to one are automatically reflected in all the others. Windows, doors, trees, chairs and millions of other things benefit from this behavior.
Shadows: Perform shade studies and add realism 
SketchUp's powerful, real-time Shadow Engine lets you perform accurate shade studies on your models.
Sections: See inside your models 
You can use SketchUp's interactive Sections feature to temporarily cut away parts of your design, enabling you to look inside. You can use Sections to create orthographic views (like floorplans), to export geometry to CAD programs using SketchUp Pro, or just to get a better view of your model while you're working on it. Section Planes can be moved, rotated and even animated using SketchUp's Scenes feature.
Scenes: Save views and create animations 
We created Scenes to enable you to easily save precise views of your model so you can come back to them later. Need to create an animation? Just create a few Scenes and click a button.
Look Around and Walk: Explore your creations firsthand 
SketchUp lets you get inside your model with a set of simple navigation tools designed to give you a first-person view. Click with Position Camera to "be standing" anywhere in your model. Use Look Around to turn your virtual head. Finally, switch to Walk to explore your creation on foot; you can even climb and descend stairs and ramps, just like you're playing a video game.
Dimensions and Labels: Add information to your designs 
You can use the super-intuitive Dimension and Label tools to add dimensions, annotations and other glorious detail to your work.
The Instructor: Catch on quickly 
SketchUp's Instructor dialog box, which you can choose to activate at any time, provides context-sensitive help.
Layers and the Outliner: Stay organized 
When you're building a big, complicated model, things can get messy very quickly. SketchUp provides two useful ways to keep your geometry manageable:
Google Earth: See your models in context 
SketchUp and Google Earth are part of the same product family, meaning you can exchange information between them easily. Need a building site for your project? Import a scaled aerial photograph, including topography, directly from Google Earth to SketchUp by clicking one button. Want to see your SketchUp model in context in Google Earth? Click another button, and you can. Anyone can use SketchUp to build models which can be seen by anyone in Google Earth.
Sandbox tools: Work on terrain 
SketchUp's Sandbox tools let you create, optimize and alter 3D terrain. You can generate a smooth landscape from a set of imported contour lines, add berms and valleys for runoff, and create a building pad and driveway.
3D Warehouse: Find models of almost anything you need 
The Google 3D Warehouse is a huge, online repository of 3D models which you can search through when you need something. Why build something when you can download it for free?
Import 3DS: Get a head start on your modeling
You can import 3DS files directly into your SketchUp models. Have a piece of furniture in 3DS format that you'd like to use? Import it in, then keep on truckin'.
Import images: Paint walls with photos
With SketchUp, you can import image files like JPGs, TIFFs, PNGs and PDFs. You can use them by themselves (kind of like posters), but you can also stick them to surfaces to create photo-realistic models of buildings, package designs, and more.
Export TIFF, JPEG and PNG
SketchUp lets you export raster images up to 10,000 pixels square, so generating an image which you can send in an email, publish in a document, or project on a wall is as easy as choosing a few options and clicking Export.
PRO Import and Export DXF and DWG: 2D line drawings and 3D models
Google SketchUp Pro allows you to import and export DXFs and DWGs, giving you an easy way to move plans, sections, elevations or even your whole model into (and out of) your favorite CAD program. Imported and exported geometry remains at 1:1 scale, and layers are preserved.
PRO Export PDF and EPS: 2D vector images
With the Pro version of Google SketchUp, you can export views of your models in PDF and EPS format, allowing you to continue to work on them in vector editing programs like Illustrator and Freehand. For 2D images that need to be resolution-independent, nothing beats exporting to these formats.
PRO Export 3DS, OBJ, XSI, FBX, VRML and DAE
If you're using Google SketchUp Pro, you can export your models to a number of useful 3D formats. Pros use a number of different tools, and these exporters allow SketchUp to join most professional workflows by offering interoperability with just about every popular 3D modeling application in existence.
For Windows XP/Vista/7 & Mac OS X (10.5+)
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