However, if that angle is unknown, because it’s just related to a graphical line in the image, there is a great option within the Rotate tool called Reference. Of course, it helps to remember that positive-number angles go counterclockwise in AutoCAD, and negative-number angles go clockwise. The Rotate tool in AutoCAD is easy to use if you know the exact angle (say, 45 degrees) that you wish to rotate the selected object. ROTATING AN IMAGE USING A REFERENCE ANGLE First, let’s focus on rotating the image. If the raster image is not rotated properly, those points will be out of alignment, making accurate measurement between the points more difficult. That is, the imaginary line between the points should be square with the computer screen. The reason for this is that the scaling procedure works best if the points that we use for reference in setting the scale factor have an orthogonal relationship to each other. Usually it’s best to do the rotation operation first. Scaling and rotating are separate operations in AutoCAD. The image will usually need to be scaled, and it will often need to be rotated. Now we will discuss how to position the image properly in the CAD model space. To see it, GO TO VIDEO on YouTube, or just view it below. I have also created a video tutorial of today’s topic (this post) and it is available on my YouTube channel.
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