But used for a long time, slowly there are small partners found some problems, such as the following two charts.
Normally, the next picture is the desired effect, but the first picture of this situation.
The operation does not seem to be a problem, TR, and then select all the objects, click on the lines to be trimmed, the steps are not wrong, the results are unexpected.
See the reason why everyone thought of here?
We re-enter the TR process once
1, TR, Enter, prompted to select the object to cut the boundary & lt; Select All & gt;, Enter
2, prompted to select the entity to be trimmed, or hold down the Shift key to select the object to be extended, or [Edge Mode (E)/Fence (F) Window Intersection (C)/Projection (P)/Delete (R)/ Abandon (U)]:
The key is here, if you try typing E to see what this edge mode is, then you probably get the idea.
Prompt for input option [Extend (E)/Not Extend (N)<Not Extend (N)>]:
The default is Not Extend, but if it is set to Extend then this is what happens in Figure 1.
By extension, it means that the graphic that is the boundary of the crop will be extended indefinitely, trimming the rest of the graphic.
So it is clear that after the extension of the red center line of Figure 1, it is also used as the boundary limit of the cropping, and eventually this situation in Figure 1 occurs.
Summary: do pruning, if the pruning object is not complex but the overall complexity of the graphic, as far as possible, you can select the boundary of a single point object. Extension of many commands for CAD, try to try to use as much as possible, many problems are solved in this way