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The sketch outline is the foundation of 3D design modeling: this function is needed whether drawing regular or irregular structures. Therefore, to master a 3D design software quickly, it is necessary to be proficient in using the \"sketching\" function. The HaoChen 3D software offers both \"sequential modeling\" and \"rapid modeling\" approaches, enabling it to handle the innovative design of native models as well as the utilization of heterogeneous CAD data, thus simplifying complex design processes. For the basic \"sketching\" function, HaoChen 3D offers significant advantages, enabling a substantial improvement in design efficiency. The editor has compiled relevant application tips for the \"sketching\" functions of \"sequential modeling\" and \"rapid modeling\" – take a look right away. 1. Default modeling mode settings: Designers can freely set the default modeling mode according to their usual design habits and specific design requirements. The method of setting it is as follows: (1) Open the HaoChen 3D design software, then go to the software’s start menu, select “Applications” – “Settings” – “Options”」 ； (2) Switch the \"Options\" window to the \"Assistant\" tab, and select \"Sequential Modeling\" or \"Quick Modeling\" to create a new design. https://pic1.cad8.net/forum/202101/13/161050bs7n8e0nwwcaznwz.gif2. Sketch drawing in sequential modeling: HaoChen 3D’s sequential modeling approach is similar to that of mainstream 3D design software, thereby ensuring continuity in work flow. The usage logic of HaoChen 3D Sketch is very simple; it can be thought of as writing or drawing on a flat surface. And this plane can be horizontal or inclined, as well as the surface plane of an object. Method to create a new sketch: Select the \"Sketch\" tab, choose one of the three default reference planes or create a new one, and then start drawing the sketch. https://pic1.cad8.net/forum/202101/13/161047cy7n30brnubr37ky.gif On the General tab, check the option \"Align window to selected plane\" so that the window is automatically aligned with the selected plane. Once selected, HaoChen 3D Design Software will automatically draw in front-view perspective when creating new sketches. (2) Automatic generation of geometric relationships ensures that options such as \"Maintain Relationship,\" \"Relationship Assistant,\" and \"Relationship Color\" remain selected and highlighted at all times. When creating new geometric shapes in this way, the software will automatically generate relationships such as connections and perpendicularity, and sketches that are \"fully defined\" versus those that are \"not fully defined\" will be distinguished by blue and black colors. (3) Settings for intelligent sketch options: whether to draw the shape first and then define the dimensions, to create dimensions while drawing, or to automatically generate dimensions first and then define the shape by modifying those dimensions. Haicheng 3D design software can provide excellent support for these diverse drawing* practices. (4) DWG/DXF drawings can be used directly in HaoChen 3D software – by selecting the \"Engineering Drawing Template\" to open the CAD file, it is possible to copy and paste DWG/DXF drawings, thereby enabling efficient reuse of drawing resources. https://pic1.cad8.net/forum/202101/13/161055t6s4ddixbt9446tg.gif（5）The \"Relationship Assistant\" feature allows for quick definition of sketches; with this feature in HaoChen 3D software, geometric relationships can be created with just one click. This applies to graphics copied from 2D CAD into HyperCAD as sketches; dimensions and relationships can be generated quickly without the need for re-labeling or creating new constraints. https://pic1.cad8.net/forum/202101/13/161052snu1nwb3hpizkcbq.gif3. Sketch drawing for rapid modeling: Compared to the complicated steps involved in \"sequential modeling,\" the sketch drawing feature in HaoChen 3D’s \"rapid modeling\" approach is more flexible. Without the need for environment switching, \"Quick Modeling\" allows for direct sketching. Unlike the single, closed contour of a sequential sketch, a quick sketch can create intersecting contours without the need for sketch trimming. The specific steps are as follows. First, select the shape to draw (line, rectangle, circle, etc.) ； Place the mouse over the drawing plane; once it is highlighted, click the \"little lock\" icon next to it or press \"F3\" on the keyboard」 ； Use the combination key «ctrl+h» to align the sketch vertically, then draw the shape ； https://pic1.cad8.net/forum/202101/13/161054l6269ooum6z20a06.gif When performing planar division, select a model plane to draw an unclosed graphic sketch, and then use \"Extrude\" or \"Cut out\". https://pic1.cad8.net/forum/202101/13/161104ye*2as*l16chhe.gif As can be seen from the above tutorial, in the HaoChen 3D design software, \"rapid modeling\" has advantages over \"sequential modeling\" – not only are the operation steps simpler, but the connection between sketch creation and feature generation is also better. Regarding specific drawing tasks such as contour drawing, dimension definition, and relationship definition, the \"sequential modeling\" and \"rapid modeling\" methods are consistent with each other, so they will not be explained again here.