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Hiding in the CAD drawing process is used to reduce distractions and improve the efficiency and accuracy of CAD drawing. Hiding in CAD during image viewing refers to the occlusion relationships between different parts of a model, which helps people quickly understand the spatial hierarchy and facilitates the interpretation of the diagram. This is similar to the differentiation in brightness, shade, and thickness of lines when printing; it serves to enhance the hierarchical structure of the drawings, facilitate quick understanding of them, and also improve their aesthetic appearance. How to hide the content of a drawing? People’s first reaction might be to use layers for hiding. So, besides layers, can we achieve hiding? Yes, and it is possible to achieve a more precise and subtle hiding. Next, the editor will use HaoChen CAD 2020 to introduce to you several \"cutting-edge techniques\" related to partial hiding in CAD. 1. Isolate command: After selecting an element, right-click and find the [Isolate] command; or go to the menu, select [Tools] – [Isolate], and then choose from the three options available in its sub-menu. The purpose of the isolation object is to hide all elements except the selected ones. The purpose of hiding an object is to temporarily hide the selected object; it complements the function of isolating objects. Ending object isolation means displaying all the objects that were hidden by the command to hide and isolate objects. The above commands are not restricted by the layer on which the object is located. It should be noted that hidden elements do not mean they no longer exist. When using automatic functions such as \"Quick Select\" to count quantities, be sure to review the results to avoid including hidden quantities in the count. Moreover, when selecting all elements, hidden ones can still be selected; we just cannot see the selection status of hidden objects. 2. Regional coverage (WIPEOUT): Many users want the blocks to cover the graphics behind them, so as to prevent the drawing from looking messy. To this end, HaoChen CAD provides the [Region Cover] command, which allows creating a region matching the outline of a block to cover the elements behind it. In this regard, ACAD does not support area coverage generation for circular or polyline boundaries with arcs, whereas HaoChen CAD 2020 supports it. Menu location: [Draw] - [Region Coverage]. To undo hiding the corresponding command: there are three methods – one is to display the boundary lines and then delete them ； 2. Close the layer containing the boundary line ； The layer where the three frozen boundary lines are located. Haocheng CAD also provides commands for breaking objects and blocks, which are used to create overlay areas automatically when creating pipelines or inserting blocks, in order to hide the elements behind them. 【Shortcuts: BREAKOBJECT for breaking objects, BLOCKBREAK for breaking blocks】 Breaking objects, breaking blocks; 3. Trim command. Location of the command: 【Modify】-【Trim】-【Xref】, shortcut key: xc. Applicable objects: Reference objects, including blocks and external references. This command is used primarily to control the display area of references based on the clipping boundary; it allows for both forward clipping (keeping the elements within the clipping boundary) and reverse clipping (hiding the elements within the clipping boundary). You can use grips to adjust the clipping boundary. In the above image, select to turn off the cropping boundary to remove the hiding. Have you mastered the “secret tricks” for local hiding in CAD? Everyone can use the Haochen CAD software on their own to practice diligently*, in order to make more efficient use of CAD drawings!