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Open the file ACA2-02.dwg. How many lines have a lineweight of 0.50mm?
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This question introduces the quick select tool. It's used on occasions where it would be faster to select objects automatically by set criteria.
You will find the quick select tool on the right mouse pop up menu, providing the command line is clear.
Start at the top of the dialogue box and work you way down, push ok when you are happy with all of the selection criteria.
The number of lines found that match up to your criteria will be shown on the command line.
There are additional lines with a width of 0.50 mm which are visible as thick lines on screen provided the LWT toggle is on or you type LWD, shortcut for Lineweight display.
The reason that they were not selected by the quick select tool, is that they were created with the property of lineweight "By layer" and Autocad treats this as different to a property to lineweight of 0.50 mm.
The same holds true for colours. So for example 2 objects can appear in the colour Red where one is colour by layer because the default colour for that layer is red. The other can be on any layer but has the colour Red property.
Normally this is not an issue as the norm is to create objects with the default "By layer" property. The colour and lineweights etc. are then determined when the layer is created or modified in the layer properties manager.
In practice before using quick select you should play detective and check out the properties of the items you wish to find, using the click and grip - right mouse properties - method. You can then use in the quick select tool criteria to find the desired objects.