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Importing & Scaling Reference Sketch

1.2_Importing & Scaling Reference Sketch

0:01 Let’s take a minute to review some of the exercise files we’ll be working with in this first course.

0:07 In the ‘References’ folder, you’ll find some sketch JPEGs and a CAD file.

0:13 These files were part of a real project design so we’ve got everything we need to create a detailed and accurate park model.

0:21 As you can see we have a sketch concept plan that we’ll use to supplement the CAD base linework.

0:28 We also have a grading plan and perspective sketch to further reinforce the design intent.

0:35 So with our model now geo-located, we can import and scale the concept sketch plan.

0:43 Before we do that let’s make sure we’re in Parallel Projection mode and plan or top view.

0:51 Now go to ‘File/Import’ and make sure that ‘All Supportive Image Types’ is selected from the dropdown.

0:59 Then check to make sure that ‘Use As Image’ is also selected.

1:03 Then browse to the sketch plan in the ‘References’ folder with your exercise files and click ‘Import’.

1:10 Set the first point of the image at the drawing origin and enter a large number, like 300’ and hit enter to set the second point.

1:19 It’s best to have the drawing larger than its real size because scaling down increases our accuracy when scaling by reference point versus scaling up from a smaller image.

1:30 Once imported, we can assign the image to a layer

1:34 Create a layer calling it ‘X-SketchPlan’.

1:38 The ‘X’ prefix is just for sorting purposes so this layer shows up at the bottom of our layer list.

1:44 The ‘X’ is a carryover from working with CAD XREFs to remind me that the image layer is just for reference in the early modeling stage and will not be needed layer.

1:53 Feel free to use any naming convention you’re familiar with if you have one.

1:59 The next step is to get our image to scale. There’s a few different ways to do this. Let’s explore two of those ways now.

2:07 Let’s start with the first option, which I’ll refer to as ‘Scale by Reference’

2:13 Go ahead and explode the image and group it.

2:16 Now, using the scale bar for reference, if we tried to scale this group using the tape measure tool and starting with one side of the scale bar...

2:25 ...then ending at the other side…you’ll see that it’s prompting us to scale the whole model...which we don’t want to do given the fact that we have terrain and aerial layers already in our model.

2:39 Instead we want just image scaled and nothing else.

2:42 To do this, double-click into the group…then repeat the process with the tape measure tool, or 'T' keyboard shortcut.

2:51 You can see now it’s asking us if we want to resize the active group or component instead of the whole model.

2:57 Yes we do...Now the plan is to scale.

3:02 Note that if you don’t have a scale bar on your sketch you can usually get by with any known fixed distance.

3:10 Parking stalls, drive lanes, or existing adjacent buildings usually work as well since they have standard or know dimensions.

3:19 Let’s check a few other known dimensions in our sketch plan to ensure we’re close enough to continue on.

3:25 Scale bar is measuring 40 feet…

3:29 Sidewalk iat 5 and half feet…

3:33 The curb is about six inches…so looks like we’re good with scale.

3:37 Let’s now import and scale the plan again with the second method.

3:42 Let’s assume the plan doesn’t have a scale bar and maybe we don’t know any fixed dimensions in the sketch.

3:48 So we’ll use two other pieces of information instead.

3:51 I know that the scale of the sketch is 1/8” = 1’ and that the paper it’s drawn on is 18” wide by 24” tall.

4:01 If I multiplied 18 by 8, or the page width by the scale factor, then the page in 1:1 scale ends up being 144’ wide.

4:13 Repeating the step again of importing the image and selecting the first point…all I do now is type 144’ into the measurements box and hit enter.

4:27 And that’s it. I’ll check the same reference the scale bar… the sidewalk…and the curb and see that the dimensions are the same.

4:47 Just another little tip, after exploding the sketch image reference, SketchUp converts it to a material that now shows up in your materials browser.

4:57 If for some reason the sketch changes after importing, you can, at any time, just select the sketch material and then either right-click and choose ‘Edit’ or double-click to bring up some additional editing options.

5:11 Then we can choose to either open and edit the sketch from here or re-load a new version of the sketch.

5:18 For example, say a team member added some additional trees to the design.

5:26 Here I’ll choose ‘Load…’ then locate the revised plan…

5:31 …and now you can see that that there are a bunch of new trees showing up in the middle planting areas where before there weren’t any.

5:38 I’ll undo that last step as we don’t really want those extra trees in there and was just for example.

5:43 Just note that when reloading images, the dimensions of the image need to be the same.

5:49 If you crop or change the scale of your plan then it will change in SketchUp after reloading and you’ll have to repeat the scale process again.

5:58 Let’s wrap this lesson up with one last step.

6:02 We need to move our scaled sketch plan on top of the aerial so it’s positioned correctly in the real world.

6:08 We can do this by turning on the location snapshot and then changing our face style to ‘XRAY’ mode.

6:15 The quality of the aerial is pretty low so it’s hard to line it up exactly.