Let’s open up a sample floor plan raster file here. Today, I’m gonna be showing you how to use Scan2CAD to convert either raster or vector images into a DXF file format that you can open up on LibreCAD. With the raster files, you’ll have to trace over them to vectorize them, and when it comes to vector files, it can only really handle its native DXF vector file. This feature was added to make it easier in Path workbench to select all the faces for a 3d pocket, but can be useful for other purposes.įull documentation can be found on github: FCBmpImport.LibreCAD is a nice piece of software but it gets kind of tricky when you try to import different image files into it. For example, if you wish to select all the faces at the same Z coordinate on the XY plane select one of the faces, click the Select Objects button, select Z in the dialog, and wait while all the faces in the object that match this criteria are added to the FreeCAD selection mechanism. The Select Objects button is used to select subobjects that share the same boundbox limits on one of the axes. See the documentation on github for more details. The points in these objects can be edited with the macro. These are mainly in dealing with imported Wires, which are Draft workbench wires. The macro also offers some other tools for wire editing. This is the main reason SVG imports are preferred. Some of the imports will be, frankly, quite ugly. Even high resolution images will be pixelated if you zoom in far enough. Images with curves and diagonals will tend to be highly pixelated. Such images can be imported as sketches and extruded in Part workbench. The best images are those with clean 90 degree angles, all horizontal and vertical with no diagonals and no curves. The progress bar is functional as long as it is the macro that is working, but when the macro completes and gives FreeCAD the object it can sometimes take a long time for FreeCAD to digest and render and may appear to be nonresponsive. Where the adjacent pixels on a line are all the same color they are combined into a single object and when importing as a single fused solid these are further combined as new lines are added. This is still 14,400 pixels! The algorithm goes raster line by raster line, so there would 120 lines. Consider the case of a relatively low resolution image of 120 x 120. If you see error messages go ahead and abort the import. The process can be quite slow depending on the resolution and complexity of the image. It's possible even to run out of memory and crash FreeCAD or even the entire computer, so be sure to save anything important you are working on. These will tend to produce too many objects for FreeCAD to be able to manage. High resolution images should be avoided. The best way is to convert to SVG and import as geometry for most cases. It should be noted there are better ways to import images into FreeCAD. With Points you can elect whether to create a new sketch with the points added as links to external geometry. With Wires imports you can elect whether to have faces made of the wires. For example, Solid offers the Lithophane option. Some of these buttons bring up dialogs for extra options. Below the Open Image button are buttons to be used for doing the import. See the screenshot below where the cross has been moved. You can add negative values to the X Offset and Y Offset boxes to move the origin prior to doing the import. The red and blue cross represents where the origin will be relative to the imported object. After opening the image it will appear in the preview pane. You can use a color BMP image for lithophane, but it will be internally interpreted as grayscale during import. These must be monochrome 1 bit per pixel unless importing as a lithophane, in which case grayscale bmp is supported. Usage: Click the Open Image button and select your image in the open file dialog. A grayscale BMP image can also be imported as a lithophane. Options for monochrome 1 bit per pixel images include importing as sketches, solids, wires, faces, or points. This macro is used to import BMP images into FreeCAD as FreeCAD objects.
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