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LDraw SlicerPro Description

Allows to stamp a flat pattern over a 3D former

SlicerPro utility allows to stamp a flat pattern over a 3D former. Each set is provided to the utility as separate LDraw files. A third file containing the raised pattern is created.

It is a simple console application, source code is provided below to anyone willing to integrate it in a more palatable user interface.

Usage

*Prepare the input LDraw pattern file. Pattern file may contain lines, triangles and quads, as well as flat primitives (see details below). Other LDraw line types are ignored.
*The 3D former file only deals with triangle and quads. Primitives may be inlined using -sf command line switch. Other LDraw line types are ignored.
*Launch a command prompt
*Type the command line: Slicerpro [options] LdrawPatternFile Ldraw3DFile Ldraw3DPatternFileOut. SlicerPro will create Ldraw3DPatternFileOut, containing the raised pattern surface. Note that if file Ldraw3DPatternFileOut exists it will be overwritten without warning.
* SlicerPro outputs file with 6 digits after decimal point, this precision is excessive for most usages and values should be rounded.

How SlicerPro works

* 3D former file is read and parsed. If -sf is specified, subfiles are recursively inlined. All surfaces are stored in an array.
* Pattern file is read and parsed. If -sp is specified, subfiles are recursively inlined. All elements are stored in an array.
* Vertices of elements in both arrays are "unified". To do so, points very close to each other are replaced by their center of mass. "Very close" means their distance is lower than threshold defined by -ut parameter, 0.005 is the default value. This helps to close small gaps existing in the part because of rounding errors. It is possible do disable this step using -ui option.
* If -x or -z options are specified, pattern and former arrays are re-oriented
* A copy of the former array is done to keep 3D information.
* Pattern and former arrays elements are flattened, and their winding is unified.
* Former array is then processed one surface at a time.

o For each former surface, overlapping elements from the pattern are selected.
o The pattern elements (except subfiles!) are cut along the edges of the surface.
o The surface cutting process may provide more pieces than needed. We get the convex hull of these elements (since the intersection of two convex shape is convex) and re-triangulate it to get an optimum number of elements. Note that this re-triangulation may be disabled with -t parameter.
o Unless -n is specified, all these elements are projected on the 3D former. For each apex of lines/triangles/quads, y coordinate of the 3D former at (x,z) point is calculated. (x,y,z) is then the 3D coordinate of the resulting apex. For primitives, projection of the primitive origin is calculated. Orientation of the 3D file facet that contains the projected origin is then used to construct the transformation matrix of the projected primitive. This is meaningful only for flat primitives that extend in x-z plane. It is the case of all disc, ndisc and ring primitives. Again, non-inlined primitives are not cut, so they must project completely on one former element or weird results will occur.

* Vertices of elements in output are "unified". This can be disabled with -uo parameter.
* Output file is written.

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