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STEP Export: include colors and alpha 

The implementation may be sub-optimal, since the colour and alpha is
defined for each NURBS surface instead of on group level, but the STEP
export currently does not represent group structure at all and I am not
familiar with the format in order to change this.

Fixes: https://github.com/solvespace/solvespace/issues/452
pull/767/head
ruevs 2020-10-21 22:16:37 +03:00 committed by phkahler
parent b3cd92899e
commit 32e695bfee
1 changed files with 28 additions and 1 deletions
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29
src/exportstep.cpp
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@ -273,9 +273,36 @@ void StepFileWriter::ExportSurface(SSurface *ss, SBezierList *sbl) {
}
fprintf(f, "),#%d,.T.);\n", srfid);
fprintf(f, "\n");
advancedFaces.Add(&advFaceId);
// Export the surface color and transparency
// https://www.cax-if.org/documents/rec_prac_styling_org_v16.pdf sections 4.4.2 4.2.4 etc.
// https://tracker.dev.opencascade.org/view.php?id=31550
fprintf(f, "#%d=COLOUR_RGB('',%.2f,%.2f,%.2f);\n", ++id, ss->color.redF(),
ss->color.greenF(), ss->color.blueF());
fprintf(f, "#%d=SURFACE_STYLE_TRANSPARENT(%.2f);\n", ++id, 1.0 - ss->color.alphaF());
fprintf(f, "#%d=SURFACE_STYLE_RENDERING_WITH_PROPERTIES(.NORMAL_SHADING.,#%d,(#%d));\n",
++id, id - 2, id - 1);
fprintf(f, "#%d=SURFACE_SIDE_STYLE('',(#%d));\n", ++id, id - 1);
/* // This also works but is more verbose.
fprintf(f, "#%d=FILL_AREA_STYLE_COLOUR('',#%d);\n", ++id, id - 1);
fprintf(f, "#%d=FILL_AREA_STYLE('',(#%d));\n", ++id, id - 1);
fprintf(f, "#%d=SURFACE_STYLE_FILL_AREA(#%d);\n", ++id, id - 1);
fprintf(f, "#%d=SURFACE_STYLE_TRANSPARENT(%.2f);\n", ++id, 1.0 - ss->color.alphaF());
fprintf(f, "#%d=SURFACE_STYLE_RENDERING_WITH_PROPERTIES(.NORMAL_SHADING.,#%d,(#%d));\n", ++id, id - 5, id - 1);
fprintf(f, "#%d=SURFACE_SIDE_STYLE('',(#%d, #%d));\n", ++id, id - 3, id - 1);
*/
fprintf(f, "#%d=SURFACE_STYLE_USAGE(.BOTH.,#%d);\n", ++id, id - 1);
fprintf(f, "#%d=PRESENTATION_STYLE_ASSIGNMENT((#%d));\n", ++id, id - 1);
fprintf(f, "#%d=STYLED_ITEM('',(#%d),#%d);\n", ++id, id - 1, advFaceId);
fprintf(f, "\n");
id++;
listOfLoops.Clear();
}