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betti drawing

Draw a model as an engineering drawing (PDF, DXF).

No licence required No sign-in needed.

Usage

Shell

betti drawing [flags] model out

Draws a model as an engineering drawing on a sheet: the front view, the view from above and a view from the side, each with its visible lines thick and its hidden lines thin and dashed; the overall width, height and depth dimensioned; a shaded view from the front, right and above in the corner the views leave free; a frame, and a title block with the title, drawing number, creator, date, scale, units and the projection symbol.

The views are placed in first angle projection, as ISO prefers (-projection third for third angle). The front looks along +y with z up. The scale is the largest standard one at which the views fit the paper (-scale sets it). Lengths are taken as millimetres.

The model is any surface mesh, a volume mesh (its outside), or, with the cad module, a CAD model, whose lines are where its faces meet. A mesh's lines are where its faces meet at -feature degrees or more, its open edges, and its outlines as seen.

In a script this is drawing(…), its flags as keywords; for coding agents, the tool drawing.

Examples

Shell

betti drawing part.step part.pdf
betti drawing -paper A4 -portrait -projection third part.stl part.svg
betti drawing -scale 1:2 -title Bracket -number B-001 -drawn VK part.step part.dxf

Formats, by the extension of out

.dxf	for CAD programs (AutoCAD R12): lines on layers, text as text; the shaded view is left out
.eps	Encapsulated PostScript, for LaTeX with dvips
.pdf	a page to print or send
.svg	for the web and drawing programs

Flags

Flag	Takes	Default	Meaning
`-approved`	text	none	who approved it
`-checked`	text	none	who checked it
`-date`	text	`today, as 2006-01-02`	the date of issue
`-dpi`	number	`200`	the shaded view's resolution, in dots an inch
`-drawn`	text	none	who drew it
`-feature`	number	`30`	for a mesh, the angle in degrees at which faces meeting make a line
`-hidden`	switch	`true`	draw hidden lines, dashed
`-iso`	switch	`true`	add a shaded view from the front, right and above
`-material`	text	none	the material, as "EN AW-6082 T6"
`-note`	length or number	none	a general note, written above the title block, numbered; repeat for more
`-number`	text	none	the drawing number
`-owner`	text	none	the legal owner, as a company
`-paper`	text	`A3`	the paper: A0, A1, A2, A3, A4 (landscape)
`-portrait`	switch	off	turn the paper upright
`-projection`	text	`first`	first or third angle projection
`-revision`	text	none	the revision, as A or 2
`-scale`	text	`auto`	the scale, as 1:2 or 5:1, or auto: the largest standard scale that fits
`-sheet`	text	`1/1`	the sheet, as 1/1
`-title`	text	`the file's name`	the title
`-tolerances`	text	none	the general tolerances, as "ISO 2768-mK"

Output flags

Flag	Takes	Default	Meaning
`-json`	switch	off	print the result as JSON
`-q`	switch	off	print nothing but errors
`-skip`	names	none	switch off steps of the work by their names, separated by commas, as the built-in help lists them
`-v`	switch	off	also show the stages of each step, and their times

This page is generated from betti help drawing. Lengths are absolute, or a percentage of the part's bounding-box diagonal, as in -size 1%.