c361630954
Adds File > Export > Current View as DXF: the visible bodies projected from the current camera onto 2D LINE/LWPOLYLINE entities, with hidden edges omitted or dashed. Co-authored-by: cronos <19868002+crono2250@users.noreply.github.com> Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
35 lines
2.3 KiB
Markdown
35 lines
2.3 KiB
Markdown
# Export the current view as DXF
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Choose **File → Export Current View as DXF…**, choose whether to omit hidden edges or
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export them as dashed lines, then choose **Export DXF…** and a destination. The hidden-edge
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choice is remembered between runs. The Japanese menu is **ファイル → 現在の表示をDXFでエクスポート…**.
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The drawing uses the camera when Export is pressed, including roll, the world's up axis
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and perspective. Only shown bodies are exported, at their current component/occurrence
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placements. Hidden bodies neither draw nor hide other bodies. The complete projected
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geometry is exported, including geometry beyond the viewport's edges. Grid, sketches,
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dimensions, selection highlights and other overlays are excluded. Turn off section analysis
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before exporting.
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Coordinates are 2D, Z=0, in millimetres. Orthographic views retain 1:1 dimensions in the
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view plane. Perspective views retain foreshortening, projected onto the plane through the
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camera target; they are intended for illustrations rather than dimensioned fabrication.
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Curves and curved silhouettes are approximated with straight segments at a default
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model-space chord tolerance of 0.01 mm. This is not an exact analytic curve export.
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The AutoCAD 2000 ASCII DXF contains `VISIBLE` (continuous) and, when requested, `HIDDEN`
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(2 mm dashes / 1 mm gaps) layers. Hidden curves use connected `LWPOLYLINE` entities with
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continuous linetype generation so the pattern does not restart on each chord. The pattern
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is embedded in the file. The polyline flags follow the
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[Autodesk DXF reference](https://help.autodesk.com/cloudhelp/2017/ENU/AutoCAD-DXF/files/GUID-748FC305-F3F2-4F74-825A-61F04D757A50.htm).
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Edges are split where another surface occludes them, including partial occlusion by another
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body. Hidden edges are never included in omit mode. Triangle diagonals and smooth seams
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are excluded; curved-body silhouettes are included. Very complex drawings fail with an
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error rather than returning an incomplete export. If geometry crosses the perspective
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camera's eye plane, zoom out before exporting.
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Programmatic callers use `file.export_view_dxf` with `camera: Camera`, `hidden: "omit"` or
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`"dashed"`, optional `tolerance` (0.0001–1 mm) and optional `path`. Without `path`, the
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command returns the DXF text. The command does not modify the design or its undo history.
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