update

.gitignore

@@ -3,3 +3,4 @@
 *.step
 *.gcode
 *.3mf
+*.FCBak

boxes/tcc-book-box-2-BodySketch005.step

@@ -0,0 +1,83 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('FreeCAD Model'),'2;1');
+FILE_NAME('Open CASCADE Shape Model','2023-11-14T20:22:00',(''),(''),
+  'Open CASCADE STEP processor 7.7','FreeCAD','Unknown');
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
+ENDSEC;
+DATA;
+#1 = APPLICATION_PROTOCOL_DEFINITION('international standard',
+  'automotive_design',2000,#2);
+#2 = APPLICATION_CONTEXT(
+  'core data for automotive mechanical design processes');
+#3 = SHAPE_DEFINITION_REPRESENTATION(#4,#10);
+#4 = PRODUCT_DEFINITION_SHAPE('','',#5);
+#5 = PRODUCT_DEFINITION('design','',#6,#9);
+#6 = PRODUCT_DEFINITION_FORMATION('','',#7);
+#7 = PRODUCT('Sketch005','Sketch005','',(#8));
+#8 = PRODUCT_CONTEXT('',#2,'mechanical');
+#9 = PRODUCT_DEFINITION_CONTEXT('part definition',#2,'design');
+#10 = GEOMETRICALLY_BOUNDED_WIREFRAME_SHAPE_REPRESENTATION('',(#11,#15),
+  #44);
+#11 = AXIS2_PLACEMENT_3D('',#12,#13,#14);
+#12 = CARTESIAN_POINT('',(0.,0.,0.));
+#13 = DIRECTION('',(0.,0.,1.));
+#14 = DIRECTION('',(1.,0.,-0.));
+#15 = GEOMETRIC_CURVE_SET('',(#16,#23,#30,#37));
+#16 = TRIMMED_CURVE('',#17,(#21,PARAMETER_VALUE(0.)),(#22,
+    PARAMETER_VALUE(0.5)),.T.,.PARAMETER.);
+#17 = LINE('',#18,#19);
+#18 = CARTESIAN_POINT('',(-120.6,32.,0.));
+#19 = VECTOR('',#20,1.);
+#20 = DIRECTION('',(0.,1.,0.));
+#21 = CARTESIAN_POINT('',(-120.6,32.,0.));
+#22 = CARTESIAN_POINT('',(-120.6,32.5,0.));
+#23 = TRIMMED_CURVE('',#24,(#28,PARAMETER_VALUE(0.)),(#29,
+    PARAMETER_VALUE(1.9)),.T.,.PARAMETER.);
+#24 = LINE('',#25,#26);
+#25 = CARTESIAN_POINT('',(-122.5,32.5,0.));
+#26 = VECTOR('',#27,1.);
+#27 = DIRECTION('',(1.,0.,0.));
+#28 = CARTESIAN_POINT('',(-122.5,32.5,0.));
+#29 = CARTESIAN_POINT('',(-120.6,32.5,0.));
+#30 = TRIMMED_CURVE('',#31,(#35,PARAMETER_VALUE(0.)),(#36,
+    PARAMETER_VALUE(0.5)),.T.,.PARAMETER.);
+#31 = LINE('',#32,#33);
+#32 = CARTESIAN_POINT('',(-122.5,32.,0.));
+#33 = VECTOR('',#34,1.);
+#34 = DIRECTION('',(0.,1.,0.));
+#35 = CARTESIAN_POINT('',(-122.5,32.,0.));
+#36 = CARTESIAN_POINT('',(-122.5,32.5,0.));
+#37 = TRIMMED_CURVE('',#38,(#42,PARAMETER_VALUE(0.)),(#43,
+    PARAMETER_VALUE(1.9)),.T.,.PARAMETER.);
+#38 = LINE('',#39,#40);
+#39 = CARTESIAN_POINT('',(-122.5,32.,0.));
+#40 = VECTOR('',#41,1.);
+#41 = DIRECTION('',(1.,4.861608192043E-14,0.));
+#42 = CARTESIAN_POINT('',(-122.5,32.,0.));
+#43 = CARTESIAN_POINT('',(-120.6,32.,0.));
+#44 = ( GEOMETRIC_REPRESENTATION_CONTEXT(3) 
+GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#48)) GLOBAL_UNIT_ASSIGNED_CONTEXT(
+(#45,#46,#47)) REPRESENTATION_CONTEXT('Context #1',
+  '3D Context with UNIT and UNCERTAINTY') );
+#45 = ( LENGTH_UNIT() NAMED_UNIT(*) SI_UNIT(.MILLI.,.METRE.) );
+#46 = ( NAMED_UNIT(*) PLANE_ANGLE_UNIT() SI_UNIT($,.RADIAN.) );
+#47 = ( NAMED_UNIT(*) SI_UNIT($,.STERADIAN.) SOLID_ANGLE_UNIT() );
+#48 = UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(2.E-04),#45,
+  'distance_accuracy_value','confusion accuracy');
+#49 = PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#7));
+#50 = MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION('',(#51),
+  #44);
+#51 = STYLED_ITEM('color',(#52),#15);
+#52 = PRESENTATION_STYLE_ASSIGNMENT((#53,#59));
+#53 = SURFACE_STYLE_USAGE(.BOTH.,#54);
+#54 = SURFACE_SIDE_STYLE('',(#55));
+#55 = SURFACE_STYLE_FILL_AREA(#56);
+#56 = FILL_AREA_STYLE('',(#57));
+#57 = FILL_AREA_STYLE_COLOUR('',#58);
+#58 = COLOUR_RGB('',0.800000010877,0.800000010877,0.800000010877);
+#59 = CURVE_STYLE('',#60,POSITIVE_LENGTH_MEASURE(0.1),#61);
+#60 = DRAUGHTING_PRE_DEFINED_CURVE_FONT('continuous');
+#61 = DRAUGHTING_PRE_DEFINED_COLOUR('white');
+ENDSEC;
+END-ISO-10303-21;