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# functions in slice3.i - s

 slice2 ``` slice2, plane, nverts, xyzverts or slice2, plane, nverts, xyzverts, values Slice a polygon list, retaining only those polygons or parts of polygons on the positive side of PLANE, that is, the side where xyz(+)*PLANE(+:1:3)-PLANE(4) > 0.0. The NVERTS, XYZVERTS, and VALUES arrays serve as both input and output, and have the meanings of the return values from the slice3 function. It is legal to omit the VALUES argument (e.g.- if there is no fcolor function). In order to plot two intersecting slices, one could slice (for example) the horizontal plane twice (slice2x) - first with the plane of the vertical slice, then with minus that same plane. Then, plot first the back part of the slice, then the vertical slice, then the front part of the horizontal slice. Of course, the vertical plane could be the one to be sliced, and "back" and "front" vary depending on the view point, but the general idea always works. interpreted function, defined at i/slice3.i line 880 ``` SEE ALSO: slice3,   plane3,   slice2x,   slice2_precision

 slice2_precision ``` slice2_precision= precision Controls how slice2 (or slice2x) handles points very close to the slicing plane. PRECISION should be a positive number or zero. Zero PRECISION means to clip exactly to the plane, with points exactly on the plane acting as if they were slightly on the side the normal points toward. Positive PRECISION means that edges are clipped to parallel planes a distance PRECISION on either side of the given plane. (Polygons lying entirely between these planes are completely discarded.) Default value is 0.0. keyword, defined at i/slice3.i line 1017 ``` SEE ALSO: slice2,   slice2x

 slice2x ``` slice2, plane, nverts, values, xyzverts Slice a polygon list, retaining only those polygons or parts of polygons on the positive side of PLANE, that is, the side where xyz(+)*PLANE(+:1:3)-PLANE(4) > 0.0. The NVERTS, VALUES, and XYZVERTS arrays serve as both input and output, and have the meanings of the return values from the slice3 function. interpreted function, defined at i/slice3.i line 863 ``` SEE ALSO: slice2,   slice2_precision

 slice3 ``` slice3, m3, fslice, nverts, xyzverts or color_values= slice3(m3, fslice, nverts, xyzverts, fcolor) or color_values= slice3(m3, fslice, nverts, xyzverts, fcolor, 1) slice the 3D mesh M3 using the slicing function FSLICE, returning the lists NVERTS and XYZVERTS. NVERTS is the number of vertices in each polygon of the slice, and XYZVERTS is the 3-by-sum(NVERTS) list of polygon vertices. If the FCOLOR argument is present, the values of that coloring function on the polygons are returned as the value of the slice3 function (numberof(color_values) == numberof(NVERTS) == number of polygons). If the slice function FSLICE is a function, it should be of the form: func fslice(m3, chunk) returning a list of function values on the specified chunk of the mesh m3. The format of chunk depends on the type of m3 mesh, so you should use only the other mesh functions xyz3 and getv3 which take m3 and chunk as arguments. The return value of fslice should have the same dimensions as the return value of getv3; the return value of xyz3 has an additional first dimension of length 3. If FSLICE is a list of 4 numbers, it is taken as a slicing plane with the equation FSLICE(+:1:3)*xyz(+)-FSLICE(4), as returned by plane3. If FSLICE is a single integer, the slice will be an isosurface for the FSLICEth variable associated with the mesh M3. In this case, the keyword value= must also be present, representing the value of that variable on the isosurface. If FCOLOR is nil, slice3 returns nil. If you want to color the polygons in a manner that depends only on their vertex coordinates (e.g.- by a 3D shading calculation), use this mode. If FCOLOR is a function, it should be of the form: func fcolor(m3, cells, l, u, fsl, fsu, ihist) returning a list of function values on the specified cells of the mesh m3. The cells argument will be the list of cell indices in m3 at which values are to be returned. l, u, fsl, fsu, and ihist are interpolation coefficients which can be used to interpolate from vertex centered values to the required cell centered values, ignoring the cells argument. See getc3 source code. The return values should always have dimsof(cells). If FCOLOR is a single integer, the slice will be an isosurface for the FCOLORth variable associated with the mesh M3. If the optional argument after FCOLOR is non-nil and non-zero, then the FCOLOR function is called with only two arguments: func fcolor(m3, cells) interpreted function, defined at i/slice3.i line 203 ``` SEE ALSO: mesh3,   plane3,   xyz3,   getv3,   getc3,   slice2,   plfp

 split_bytscl ``` split_bytscl(x, 0) or split_bytscl(x, 1) as bytscl function, but scale to the lower half of a split palette (0-99, normally the color scale) if the second parameter is zero or nil, or the upper half (100-199, normally the gray scale) if the second parameter is non-zero. interpreted function, defined at i/slice3.i line 1253 ``` SEE ALSO: split_palette

 split_palette ``` split_palette or split_palette, "palette_name.gp" split the current palette or the specified palette into two parts; colors 0 to 99 will be a compressed version of the original, while colors 100 to 199 will be a gray scale. interpreted function, defined at i/slice3.i line 1226 ``` SEE ALSO: pl3tree,   split_bytscl