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When using the HaoChen CAD drawing software to create CAD drawings, one often encounters various difficult problems; for example, when trying to apply CAD fill patterns, it’s not possible to do so at all. What causes this? Let me give you a detailed introduction below! Reasons why CAD fill patterns are ineffective: 1. The area is not closed: Zoom in on the graphic to check if there are gaps at the junctions of the lines; fill these gaps by extending the lines with straight segments. 2. Issue with ratio settings: An excessively high or low ratio is not suitable for areas that need to be filled. The filling ratio can be reset. 3. Turn off solid filling: Enable the “Solid Filling” function in the software’s “Options” settings. Solution 1 for invalid CAD hatch patterns: First, open the HaoChen CAD software, then activate the “BH” command to bring up the “Hatch and Gradient Colors” dialog box. As shown in the figure below: in the \"Hatch\" section, select the \"Boundary\" tab. Find the “Add: Select Entity” button. Then use the mouse to select the block that needs to be filled, right-click and choose “OK”. Solution 2 for invalid CAD hatch patterns: Open the HaoChen CAD software, enter the “OPTIONS” command in the CAD command line, and press Enter to confirm execution. The “Options” dialog box appears automatically; at this point, switch to the third tab, the “Display” dialog box, and check the “Apply solid filling” checkbox. Then click the “OK” button to complete the settings. As shown in the figure below: Solution 3 for invalid CAD hatch patterns: After opening the HaoChen CAD software, enter the “FILLMODE” command in the command line, then press Enter to execute this command. Enter the new value for FILLMODE as prompted in the command line: 1, then press Enter to confirm. The above are the reasons why CAD hatch patterns do not work in the Haochen CAD drawing software, along with the solutions to these issues. I hope this will be helpful to everyone.