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When using the Haochen CAD software to create drawings, those who are just starting to learn CAD may often encounter various issues with the display of CAD drawings or graphics, such as text not being visible or fill patterns not showing up. These problems arise due to incorrect settings of certain parameters or options. There are also some common display issues; when double-clicking the middle button on a CAD drawing, the drawing disappears or turns into a small dot ； After double-clicking the middle button, the graphic is not centered; it appears in a corner of the graphic display window ； The graphic can be seen in the layout viewport, but not in model space ； The layer isn’t closed, but the viewport boundaries are just not visible, etc. To this end, some common issues and their solutions in this area have been summarized for those who are just starting to learn CAD; take a look! If the graphics are not visible in the model space of a CAD file, first check whether the CAD layers are turned off or frozen. If the graphics are visible in model space but not in layout space, then it’s necessary to check whether the layers are frozen in the current viewport. If the layer is not closed or frozen, check whether the graphic is hidden or isolated. If it is not due to these two reasons, then it is an abnormality in graphic display, and the cause needs to be analyzed based on the specific symptoms. The issue of abnormal display, where the graphics disappear or turn into a small dot after double-clicking the middle mouse button, is quite common. In some cases, the CAD drawings appear normally when opened, but after double-clicking the middle button (so that the entire image is displayed), the graphics disappear or turn into a small dot; or the graphics shown are not the same as those originally there. Such drawings are quite common, but the reason behind their creation remains a mystery. It was later discovered that many of these drawings were created using the Z-axis zeroing method or certain plugins; yesterday, a user shared a drawing that encountered similar problems after using the Z-axis zeroing function of a certain tool kit. Problem phenomenon: Extra graphics are generated at distances extremely far from the graphic, with these distances ranging from 10 to the 30th power to 10 to the 99th power; 10 to the 99th power is a distance that is well beyond the boundaries of the universe as known to humans. Verification method: Do not select any objects, open the properties panel (CTRL+1), and check the dimensions of the view to see if the values are unusually large, as shown in the figure below. The view size of this drawing reaches 10 to the 36th power, and the size of the unnecessary graphics is also large; it’s still possible to see them. However, when the entire image is zoomed in, many of these graphics appear as just a few dots, or not at all. It becomes impossible to tell which ones are unnecessary graphics and which ones are the actual useful ones. Moreover, using the scroll wheel to zoom in doesn’t help in displaying the graphics that one needs. Solution: 1. First, enable the PU cleanup function to check for geometric objects with zero length or empty text objects; if such objects exist, clean them up first. 2. First, find a way to display the required graphics. If the graphic was displaying normally before double-clicking the middle button, quickly revert (CTRL+Z) to restore the previous view. If it is already not functioning properly when opened, one can only try to scale it in order to display a normal view; at this point, using the regular scroll wheel for scaling or selecting a region of the window for scaling is no longer sufficient to solve the problem. Generally, the graph is drawn near the origin; it can be scaled using the window, but the window cannot be selected by framing it – window coordinates need to be entered instead. Enter Z and press Enter, then enter W and press Enter. For the coordinates, enter 0,0 and 100000,100000 respectively (it’s best to enter these values in the command line; if entered through the dynamic input in the graphics window, the values are assumed to be relative coordinates). This will display the graph within the range from the origin to 10000,10000. This state may display the entire graphic, or only a portion of it; then, by using translation and scaling, we can show the whole of the graphic that we want to retain. However, for some drawings whose view center is far away from the origin and the above method does not work, you can try using center scaling. The steps are as follows: enter Z and press Enter, then enter C and press Enter; enter 0,0 for the center point and press Enter, and then enter a height based on the approximate size of the graphic, such as 100000 or 1000000. If part or all of the graphic is visible, manually zoom and pan to display the entire graphic. This method won’t work; in that case, the only option is to create a new image and then copy and paste this image into it. However, since the coordinates of this image are very large, the result after pasting might not be correct. In short, we need to find a way to display all the graphics we need; for example, the result of scaling the previous image is shown in the figure below. 3. Find a way to select and delete the extra graphics. It’s easy once you’ve found the graphics you want to keep: press CTRL+A to select everything, then hold down the SHIFT key and click to select the graphics you want to retain; this will highlight the unnecessary graphics. Press DELETE or type E and hit Enter to remove those unnecessary graphics. Usually, after doing this, double-clicking the middle mouse button works normally. Sometimes there are special cases where some tiles have part of them within the normal graphic range, but the graphics inside are located at a great distance, which can be quite troublesome. In the above operations, to select the retained graphics by inversion, you can select them from left to right, thereby filtering out such elements and deleting them. For those who are just starting to learn CAD, when using the HaoChen CAD software to create drawings, if the graphics disappear or turn into a small dot after double-clicking the middle button of the mouse, there are various reasons for this phenomenon, and different solutions should be chosen depending on the specific situation.