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How to put 3D in CAD in 2D space?
This command must be used in layout space. The following is a description of the cad help file. Try it and you'll know how to use it. Need to be reminded that this command will automatically create two layers, PV and PH (described in detail below), and the two blocks will fall on the plane of z=0. If it is not found, it may overlap with the entity (just open the PV and you can see the pH layer).

Drawing menu: Entity => "Settings" = >; "outline"

Command line: solprof

Select Object: Use the object selection method.

Show hidden outlines in a separate layer? [Yes (Y)/ No (n)]: ENTER Y or N, or press Enter.

be

Only two blocks are generated: one for the visible straight line of the whole selection set and the other for the hidden line of the whole selection set. When generating hidden lines, entities can partially or completely hide other entities. The linetype used for drawing visible outline blocks is By Layer, and the linetype used for drawing hidden outline blocks is Hidden (if loaded). Visible lines and hidden line blocks are placed on layers named according to the following naming rules:

PV viewport handles are used for visible contour layers.

The PH- viewport handle is used to hide the outline layer.

For example, if you create an outline map in a viewport with handle 4B, blocks containing visible lines will be inserted into the PV-4B layer, and blocks containing hidden lines (if necessary) will be inserted into the PH-4B layer. If these layers do not exist, the command will create them. If these layers already exist, these blocks will be added to the information that already exists on the layers.

Note: To determine the viewport handle, select the viewport in paper space and use the LIST command. Select the layout tab to be converted from model space to paper space.

V does not change the display of layers; If you only need to observe the newly created contour, close the layer containing the original solid (usually the current layer).

no

Treat all contours as visible lines and create a block for the contour of each selected entity. All contours of each element in the selection set are created, regardless of whether it is completely or partially obscured by another element. Draw a visible outline block with the same line type as the original solid, and place it on a uniquely named layer according to the naming rules described in the Yes option.

Note that if you want to delete hidden lines, overlapping entities (* * * use some common parts) will produce overhanging edges. This is because edges must be broken at the point where they enter another entity, so that they can be distinguished whether they are visible or hidden. Before generating the outline, you can eliminate the protruding edges by merging overlapping entities (using the UNION command).

The next prompt determines whether to use two-dimensional objects or three-dimensional objects to represent the visible and hidden lines of the outline.

Do you want to project the outline onto a plane? [Yes (Y)/ No (n)]: ENTER Y or N, or press Enter.

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AutoCAD will use 2D objects to create contour lines. The three-dimensional contour is projected onto a plane perpendicular to the observation direction and passing through the origin of UCS. SOLPROF can clean the two-dimensional contour by eliminating the straight line parallel to the observation direction and converting the arc and circle observed from the side into straight lines.

no

AutoCAD will use 3D objects to create contour lines.

The next command determines whether tangent edges are displayed. Trimming refers to the boundary edge between two tangent planes, which is just an imaginary edge where two edges intersect and are tangent. For example, if you want to fillet the edges of a box, a tangent edge will be created at the junction of the cylindrical surface and the plane of the box. Most graphics applications do not display tangent edges.