By SketchUp has a relatively little-known feature that often helps when it comes to making roofs with lots of pitches: Intersect Faces. Here’s what you need to know about this terrific little tool:. Intersect Faces makes new geometry from existing geometry. It takes faces you’ve selected and creates edges wherever they intersect. Perhaps you want to make a model that’s a cube with a cylinder-shaped chunk taken out of it.

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You’d model the cube and model the cylinder. After positioning them carefully, you can then use Intersect Faces to create edges where the two shapes’ faces come together. After that, you’d use the Eraser to get rid of the edges you didn’t want — the rest of the cylinder, in this case. Intersect Faces and the Eraser tool go hand in hand. Anytime you use Intersect Faces, you need to follow up by deleting the geometry you don’t want. This isn’t a bad thing, but it does mean that you need to be good at orbiting, zooming, and panning around your model. You also need to be handy with the Eraser.

UPDATE: Works with SketchUp 8. The Make Faces plugin created by Todd Burch with Smustard.com is a good tool to make imports from AutoCAD easier to work with.

Most of the time, choose Intersect Faces with Model. This tool has three modes, but the majority of the time, you use the basic one. Here’s what all three modes do:. Intersect Faces with Model: Creates edges everywhere your selected faces intersect with other faces in your model — whether the other faces are selected or not.

Intersect Faces with Selection: Only creates edges where selected faces intersect with other selected faces. This is handy if you’re trying to be a little bit more precise. Intersect Faces with Context: This one’s a little trickier: Choosing this option creates edges where faces within the same group or component intersect; that’s why it’s available only when you edit a group or component. Intersect Faces doesn’t have a button.

To use it, you have to either. Right-click and choose Intersect Faces.

Choose Edit→Intersect Faces.

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Mitchell: Also I think SU comes with a create face utility, it's crude but can help you also. Try widow=preferences= extensions and select/check utilities. This should give you under tools / utilities a create face tool. Select your lines and if it does not create a face it will give some indication why not.There are other plugins,search under make face 1.4.this more robust than create face I am trying to visualize the extrude a round a radius and when an atypical polygon is extruded surfaces are not formed.

I am wondering the problem my be caused by what you are trying to do and how Can you straighten me out?? Thanks jgb 21.09.08 7:48. Hello everyone, I am new to SketchUP and while i watched every single tutorial available, i don't think my problem was covered. I imported a CAD drawing and need to make a 3d out of it. I believe i need to use a push/pull tool but i know that will only work on surfaces and not edges. Which leads to a dilemma: all of the lines on this imported drawing are flat and don't have surfaces. They are just lines.

They are connected and on the same plane. It doesn't look like i can pull them the way they are. Do I need to redraw all of them or is there a trick to make them 3d without having a surface? (re-drawing seems to be extremely unpractical; why then import?) Hoping to resolve this today as i need to actually finish a project in SketchUP by tomorrow morning!

Any help would be appreciated, Thanks, Liz - Show quoted text - Hide quoted text - Thomas Bleicher 21.09.08 10:06. Hi Liz On 21 Sep 2008, at 17:51, wrote: I imported a CAD drawing and need to make a 3d out of it. I believe i need to use a push/pull tool but i know that will only work on surfaces and not edges. Which leads to a dilemma: all of the lines on this imported drawing are flat and don't have surfaces. Do I need to redraw all of them or is there a trick to make them 3d without having a surface? If your CAD drawing was done with end point snap so that most lines where another one starts you can just start redrawing one line of a surface and the rest will be created by following a closed path along the lines automatically - at least that's my experience. However, if you're drawing has lines ending everywhere so that Sketchup can't connect two lines at one point you're out of luck and you will have to redraw the whole thing.

(re-drawing seems to be extremely unpractical; why then import?) If your CAD drawing did only contain lines, how should Sketchup know where 3D faces are supposed to be. I found the CAD import quite sufficient provided that the CAD file did contain the right sort of information. You have to choose the right import settings, too.

It's quite annoying when your simple looking sketchup surface turns out to be made out of lots of triangles that have not been merged to one surface. Also check the information pop up that appears after the import for entities that could not be translated. The faces might be in there, but Sketchup simply can't understand it. Regards, Thomas Gully Foyle 21.09.08 10:10. Ikos; 1) Go to skecthucation, tutorials and look for how a pro builds. ( don't rember the name for sure).

There is a part 1 and 2; 2) This link takes you to youtube video on working with cad files. This is a German link but in English and is part 2, there are about four different parts in total.They say you have to sketch over the plan drawing but it does not take long. I got to this link looking for something else and changing de=www may get the same thing; 3) You have changed this thread some what and may not get the responses you what, start a new thread maybe better for you? My 2 cents worth Mitchell Tatum 21.09.08 10:25. The 'create a face' utility worked! As for what I am doing, imagine a trapezoid where the bottom and top are not parallel to the z axis, but at an angle.

Then draw a circle with the center on the axis, and the radius touching the bottom of the trapezoid. Then, extrude the trap around the circle, and don't complete the entire circle. Sometimes the resulting exposed trap is not filled in.

Sent from my Verizon Wireless BlackBerry -Original Message- From: mac1 Date: Sat, 20 Sep 2008 19:59:55 To: Google SketchUp Help - SketchUp General Subject: Re: How to create a surface from a collection of lines basic.works 21.09.08 12:40. Seth Becker Oakstone Financial Management, LLC (614) 775-9469 office (614) 562-9787 cell (614) 855-4803 fax Integrity, Intelligence and Best Process Seth Becker offering securities through Cadaret, Grant & Co., Inc., member NASD/SIPC. Cadaret Grant One Lincoln Center Syracuse, NY 13202. (315) 471-2191. Oakstone Financial Management, LLC and Cadaret, Grant are separate entities -Original Message- From: mailto: On Behalf Of basic works Sent: Sunday, September 21, 2008 3:45 PM To: Subject: Re: How to create a surface from a collection of lines.

Is there a user's manual, or some time of guide, to using sketchbook? Seth Becker Oakstone Financial Management, LLC (614) 775-9469 office (614) 562-9787 cell (614) 855-4803 fax Integrity, Intelligence and Best Process Seth Becker offering securities through Cadaret, Grant & Co., Inc., member NASD/SIPC. Cadaret Grant One Lincoln Center Syracuse, NY 13202.

(315) 471-2191. Oakstone Financial Management, LLC and Cadaret, Grant are separate entities -Original Message- From: mailto: On Behalf Of jgb Sent: Wednesday, September 24, 2008 6:59 AM To: Google SketchUp Help - SketchUp General Subject: Re: How to create a surface from a collection of lines Gaieus 25.09.08 5:43.