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Currently, most of the time spent on 3D design is devoted to sketching. Unlike traditional 3D design software, which is \"inefficient and difficult to use,\" engineers can quickly create engineering drawings using the intelligent geometric constraint commands in HC3D software, and they can also establish geometric constraints and perform parametric definitions with precision. Today, I’ll share with you how the HaoChen 3D software can be used effectively to apply geometric constraints in sketch mode, thereby enabling fast drawing. What are geometric constraint relationships? Geometric constraint relationships refer to the function of adding geometric relations to certain elements in a sketch, thereby establishing positional constraints between them. These mainly include connection, horizontal, vertical, tangent, parallel, equal, symmetric, concentric, perpendicular, and collinear relationships. How to use geometric constraint relationships? Select \"Sketch\" - \"Relations\" from the toolbar, choose the desired geometric constraint command, and then select the sketch on which the constraint is to be applied to complete the application of the constraint. Tip: The second-selected pixel will serve as a reference and remain unchanged, while the first-selected pixel will move to the position of the second-selected pixel to be constrained. To delete or remove unwanted geometric constraints, simply select the geometric relationship in the sketch; the corresponding icon will turn green, after which you can press \"Delete\" to remove it. If there is overlapping geometric constraint, \"Quick Selection\" can be used for selective deletion. How to show and hide geometric constraints? Select the toolbar option \"Sketch\" – \"Related\" – \"Relationship Handle\"; this command is enabled by default. During the sketching process, geometric constraint relationships are automatically displayed in the sketch environment. When there are many constraints, the interface prompts can interfere with engineers’ rapid design. Therefore, the display of geometric relationships can be turned off manually to keep the sketch interface tidy. How to maintain geometric constraints? Select from the toolbar \"Sketch\" - \"Related\" - \"Maintain Relationships\"; this command is enabled by default. When this command is enabled, HaoChen 3D software will automatically make judgments based on the engineer’s drawings and add the corresponding geometric constraints. If this command is turned off, the drawn content will not have geometric constraints applied to it. Therefore, please keep this command active. The sketch constraint features in HaoChen 3D software enable engineers to quickly create predefined sketch outlines and fully define the sketches, thus achieving twice the result with half the effort. Of course, the strengths of HaoChen 3D software go far beyond this; the editor will share more related 3D design tutorials in the future.