It can be used to generate a sheet cutting layout for a (truncated) cone. This extensions draws the 2D shape which is required to form a 3D cone (or truncated cone) after it's cut out (of whatever material). it will show 10 cm to the left of the scale rule center (labelled 0) and 10 cm to its right. Those will be doubled in the generated scale rule - e.g. Now choose the number of units the scale rule will comprise.If you would like the scale rule to be drawn on the page, check the option 'Generate Scale Rule'.In the 'Custom' field, however, you can also enter values smaller than 1 to upscale a drawing. The dropdowns only offer scale factors for downscaling. Then, in the corresponding dropdown, or in the number entry field, select or enter the scale you would like to use.To do so, first select if you want to use a metric scale factor (based on mulitples of 5) or an imperial one (based on multiples of 2) or if you would like to enter your own scale factor.If you intend to print the drawing, and the original object is bigger than the sheet, consider using a scale factor.Select the unit you used (for your 10.50 m house, select m for your 10 cm cardboard box, select cm).Enter the length of the line you just drew, as it is in the real world (for example, if your house wall is 10.5 m long, enter 10.50.Open the extension dialog: Extensions -> Scaling -> RealScale.Select the line, then add the drawing to the selection.Draw a straight line that connects two points in that drawing of which you know the distance in real life (for example, if you know how long a wall of your house in the drawing is, draw the line from one end of the wall to the other). Make sure it is a single object (group it, if necessary). into Inkscape or open a file containing one.
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