
blocklyThis project creates a double curved parametric model by lofting surface from interpolated periodic bspline curves. By using our new OpenCascade (OCCT) components we modelled the solid geometry. This object can thus be exported and 3D printed. This small example demonstrates how to draw 2D curves on 3D double curved surfaces, split edges, loft and sew faces to form shells and thick solid objects.
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<block type="variables_set" id=".|z.PlNc:)4IVkPeHT)9">
<field name="VAR" id="e/$DaRE5=XZ{x#TU~wUs">curve3</field>
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<statement name="Then">
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<mutation name="makeUvParams">
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<block type="variables_get" id="A]%pKmuwuR#D;.a4*-3p">
<field name="VAR" id="3ZsSD-.`eXDI9gfdsbxI">face1</field>
</block>
</value>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="N}ZXGB~;ow.]{?:d)XDM">
<field name="VAR" id="O2DS:5q7f[YJK*wE`T[P">uvParams2</field>
<value name="VALUE">
<block type="base_time_await_return" id="a7dz5W1F5@J0-=a[K()F">
<value name="Promise">
<block type="procedures_callreturn" id="VCi_P24c9hsKjx+)rKED">
<mutation name="makeUvParams">
<arg name="face">
</arg>
</mutation>
<value name="ARG0">
<block type="variables_get" id="!$yrdQ=/$s5(e(lH%(6$">
<field name="VAR" id="85.A(S/.oO4yqw%tD^8|">face2</field>
</block>
</value>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="mTN,`HfUA*M~6/pkO|4D">
<field name="VAR" id="DKAISb%*M~+$/_,:ECDc">ellipsesOnSurface1</field>
<value name="VALUE">
<block type="base_time_await_return" id="+Bgyh^LFn|*HR2Lu,hic">
<value name="Promise">
<block type="procedures_callreturn" id="egx6Wh$kLkS.LaQjwk_3">
<mutation name="ellipsesOnSurface">
<arg name="uvParams">
</arg>
<arg name="srf">
</arg>
<arg name="ellipseMinor">
</arg>
<arg name="ellipseMajor">
</arg>
</mutation>
<value name="ARG0">
<block type="variables_get" id="Hf`(]MO$!twV=Icmbjt:">
<field name="VAR" id="Jb}OqCmeVh~H-cDIX%{e">uvParams1</field>
</block>
</value>
<value name="ARG1">
<block type="bitbybit.occt.geom.surfaces.surfaceFromFace" id=",=dVi{P,Zy0je,NnP|-+">
<value name="Shape">
<block type="variables_get" id="#a~5]u]EfCfPq%pKQ0p^">
<field name="VAR" id="3ZsSD-.`eXDI9gfdsbxI">face1</field>
</block>
</value>
</block>
</value>
<value name="ARG2">
<block type="math_number" id=",~rqhJ:g^yo%~+tS:`~n">
<field name="NUM">0.02</field>
</block>
</value>
<value name="ARG3">
<block type="math_number" id="J73fz:2qEvYwx(G:%1Qr">
<field name="NUM">0.04</field>
</block>
</value>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="QtU#z!cz`chcz^w+TdPm">
<field name="VAR" id="6$-:{2?d3;2Ey92n.xr4">ellipsesOnSurface2</field>
<value name="VALUE">
<block type="base_time_await_return" id="t!EtPPP+uSV5.iTNY7?C">
<value name="Promise">
<block type="procedures_callreturn" id="FxdCpHKXe,pf}9]qZ`?p">
<mutation name="ellipsesOnSurface">
<arg name="uvParams">
</arg>
<arg name="srf">
</arg>
<arg name="ellipseMinor">
</arg>
<arg name="ellipseMajor">
</arg>
</mutation>
<value name="ARG0">
<block type="variables_get" id="zR?i`(J:.B}YsdU~q#5f">
<field name="VAR" id="O2DS:5q7f[YJK*wE`T[P">uvParams2</field>
</block>
</value>
<value name="ARG1">
<block type="bitbybit.occt.geom.surfaces.surfaceFromFace" id="RPy7Bux5B4kpl0I@tgg5">
<value name="Shape">
<block type="variables_get" id="I]xhwturSkmkG!bh1cJ3">
<field name="VAR" id="85.A(S/.oO4yqw%tD^8|">face2</field>
</block>
</value>
</block>
</value>
<value name="ARG2">
<block type="math_number" id="^0B34{d}[a5GefT0p%|{">
<field name="NUM">0.01</field>
</block>
</value>
<value name="ARG3">
<block type="math_number" id="6P,-_|Pcf?i0*5/VCAMz">
<field name="NUM">0.01</field>
</block>
</value>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="R1t+=kG}{ie4xNDhhg/c">
<field name="VAR" id="6Uobshv).d$BLqg6z[/f">toSew</field>
<value name="VALUE">
<block type="lists_create_with" id="Y?]J?8PEu_H:W?Y2Z}Or">
<mutation items="0">
</mutation>
</block>
</value>
<next>
<block type="controls_for" id=",,J#W@pUp|RL{Dmi:mR}">
<field name="VAR" id="APfT.`+4@$eBae(4%o(O">j</field>
<value name="FROM">
<block type="math_number" id="kBdk1*[_o?S?sTo:GrDK">
<field name="NUM">1</field>
</block>
</value>
<value name="TO">
<block type="lists_length" id="%oGUe]Vl/q`@+]OShH$c">
<value name="VALUE">
<block type="variables_get" id="|sNrqwr8GzQ3KB7BQ[+R">
<field name="VAR" id="DKAISb%*M~+$/_,:ECDc">ellipsesOnSurface1</field>
</block>
</value>
</block>
</value>
<value name="BY">
<block type="math_number" id="]8mupjBLaBtyzeS}/gFQ">
<field name="NUM">1</field>
</block>
</value>
<statement name="DO">
<block type="variables_set" id="9b4/W(pY*P6~/BdgsDdX">
<field name="VAR" id="m!J4oi0a0k5gLjuS2aU2">e1</field>
<value name="VALUE">
<block type="lists_getIndex" id="ZauN.m1R^C2,YziXrYLt">
<mutation statement="false" at="true">
</mutation>
<field name="MODE">GET</field>
<field name="WHERE">FROM_START</field>
<value name="VALUE">
<block type="variables_get" id="{)hs^coS(ocNLn:0-aFv">
<field name="VAR" id="DKAISb%*M~+$/_,:ECDc">ellipsesOnSurface1</field>
</block>
</value>
<value name="AT">
<block type="variables_get" id="l*M9`a3]GpigKdt~0+a1">
<field name="VAR" id="APfT.`+4@$eBae(4%o(O">j</field>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="8s`R?K!)@8ZHEgaVQ-M~">
<field name="VAR" id="FGrDwhNZ]G{|YJ-Wwq5S">e2</field>
<value name="VALUE">
<block type="lists_getIndex" id="2J02n_`m@GVoum#(ur)H">
<mutation statement="false" at="true">
</mutation>
<field name="MODE">GET</field>
<field name="WHERE">FROM_START</field>
<value name="VALUE">
<block type="variables_get" id="xk0nKlw$QHU+)L?qkjV$">
<field name="VAR" id="6$-:{2?d3;2Ey92n.xr4">ellipsesOnSurface2</field>
</block>
</value>
<value name="AT">
<block type="variables_get" id="9I5yzp,ndCz/r15XV8/`">
<field name="VAR" id="APfT.`+4@$eBae(4%o(O">j</field>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set" id="Ne8K;=RFvC;jiC`Yh?Au">
<field name="VAR" id="EW(,TM7|IXP0/Ba}#T9.">loft</field>
<value name="VALUE">
<block type="bitbybit.occt.operations.loft" id="uaNP4_XvRHhSRys^76;_">
<value name="Shapes">
<block type="lists_create_with" id="}[h](/UU^l_Ho1x!A]mC">
<mutation items="2">
</mutation>
<value name="ADD0">
<block type="variables_get" id="6;)qkqR#{(,O*%;3*!EK">
<field name="VAR" id="m!J4oi0a0k5gLjuS2aU2">e1</field>
</block>
</value>
<value name="ADD1">
<block type="variables_get" id="RC^~6UCS7b:fD89eS_t]">
<field name="VAR" id="FGrDwhNZ]G{|YJ-Wwq5S">e2</field>
</block>
</value>
</block>
</value>
<value name="MakeSolid">
<block type="logic_boolean" id="=_?cU[++$4HGF`:A6Nu/">
<field name="BOOL">FALSE</field>
</block>
</value>
</block>
</value>
<next>
<block type="lists_setIndex" id="i3#W`zB8@i$WOOpvZb9^">
<mutation at="false">
</mutation>
<field name="MODE">INSERT</field>
<field name="WHERE">LAST</field>
<value name="LIST">
<block type="variables_get" id="?odelcd?b*S,kaC8+D_H">
<field name="VAR" id="6Uobshv).d$BLqg6z[/f">toSew</field>
</block>
</value>
<value name="TO">
<block type="variables_get" id="L(keG)|uedex*LgbU:%H">
<field name="VAR" id="EW(,TM7|IXP0/Ba}#T9.">loft</field>
</block>
</value>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</statement>
<next>
<block type="lists_setIndex" id="jkzI)587G*KvOOW~KPtg">
<mutation at="false">
</mutation>
<field name="MODE">INSERT</field>
<field name="WHERE">LAST</field>
<value name="LIST">
<block type="variables_get" id="5)fD?%#@pj9w{rY;)^HR">
<field name="VAR" id="6Uobshv).d$BLqg6z[/f">toSew</field>
</block>
</value>
<value name="TO">
<block type="bitbybit.occt.shapes.face.reversedFace" id="_JE@lg:TH@6-n.xbGYN7">
<value name="Shape">
<block type="bitbybit.occt.shapes.face.getFace" id="-QW]s);GJm2Hx+/kDndM">
<value name="Shape">
<block type="bitbybit.occt.operations.splitShapeWithShapes" id="JD!8nW~F]0s-Z(pP=+t-">
<value name="Shape">
<block type="variables_get" id=":v{x5X[muP+-Rl7ln3f]">
<field name="VAR" id="3ZsSD-.`eXDI9gfdsbxI">face1</field>
</block>
</value>
<value name="Shapes">
<block type="variables_get" id="x8D8LW,B7SE+Fpe%du%h">
<field name="VAR" id="DKAISb%*M~+$/_,:ECDc">ellipsesOnSurface1</field>
</block>
</value>
</block>
</value>
<value name="Index">
<block type="math_arithmetic" id="K#|!V12X:5c2KF/$}%^L">
<field name="OP">MINUS</field>
<value name="A">
<block type="lists_length" id="R85IM-GWE=Ai^w`yEG#x">
<value name="VALUE">
<block type="variables_get" id="s3#|q*Rs/Dc/uKQ*}-Q~">
<field name="VAR" id="DKAISb%*M~+$/_,:ECDc">ellipsesOnSurface1</field>
</block>
</value>
</block>
</value>
<value name="B">
<block type="math_number" id="ZyK7*yp-40HUQ9V4SP.G">
<field name="NUM">1</field>
</block>
</value>
</block>
</value>
</block>
</value>
</block>
</value>
<next>
<block type="lists_setIndex" id="bb:Th$y`#@?f=`=R`SFT">
<mutation at="false">
</mutation>
<field name="MODE">INSERT</field>
<field name="WHERE">LAST</field>
<value name="LIST">
<block type="variables_get" id="~MK!GvAjp|wi}.wupcns">
<field name="VAR" id="6Uobshv).d$BLqg6z[/f">toSew</field>
</block>
</value>
<value name="TO">
<block type="bitbybit.occt.shapes.face.createFaceFromWire" id="#(2m|%H_m;DYFmIN|J[.">
<value name="Shape">
<block type="variables_get" id="Pl(Mt*6-IkXiX-`xcDA$">
<field name="VAR" id="Hc+aQ,@M,j{Qx2DhN*W:">curve1</field>
</block>
</value>
<value name="Planar">
<block type="logic_boolean" id="?%v}-FM*{}ld/_T)Qa!o">
<field name="BOOL">TRUE</field>
</block>
</value>
</block>
</value>
<next>
<block type="bitbybit.draw.drawAnyAsyncNoReturn" id="_/4BHHAR0|NDx/jiphbs">
<value name="Entity">
<block type="bitbybit.occt.operations.makeThickSolidSimple" id="#ru0BJeQV$.`$s{zS^PM">
<value name="Shape">
<block type="bitbybit.occt.fillets.filletEdges" id="N-L2n=/y#*4D5Pbse9q[">
<value name="Shape">
<block type="bitbybit.occt.shapes.shell.sewFaces" id="Uk40VNCvG-ol1mZ-4O(8">
<value name="Shapes">
<block type="variables_get" id="P:_PNdiJTDV@.1SX%(5x">
<field name="VAR" id="6Uobshv).d$BLqg6z[/f">toSew</field>
</block>
</value>
<value name="Tolerance">
<block type="math_number" id="$2O+2LyKURmb5E]R9C99">
<field name="NUM">0.001</field>
</block>
</value>
</block>
</value>
<value name="Radius">
<block type="math_number" id="/MMBpi(us7#1S,e{a)]L">
<field name="NUM">0.65</field>
</block>
</value>
</block>
</value>
<value name="Offset">
<block type="math_number" id="sEoIRG*:-+pSVLlNH8}T">
<field name="NUM">-0.2</field>
</block>
</value>
</block>
</value>
<value name="Options">
<block type="bitbybit.draw.optionsOcctShapeMaterial" id="`c:MG]n)x4NwT7~YZrzw">
<value name="Precision">
<block type="math_number" id="!4[3BQOBk84[6p4:/oVd">
<field name="NUM">0.1</field>
</block>
</value>
<value name="FaceMaterial">
<block type="bitbybit.babylon.material.pbrMetallicRoughness.create" id="BPQRGva8aPQS#nL(oZzj">
<value name="Name">
<block type="text" id="/4hY):vy^ZDF/-;wGQv~">
<field name="TEXT">MyMaterial</field>
</block>
</value>
<value name="BaseColor">
<block type="colour_picker" id="!LD2A|*zOpnJQE[{nz!?">
<field name="COLOUR">#cc33cc</field>
</block>
</value>
<value name="Metallic">
<block type="math_number" id="ryGQgSUOAxJ9.-UJn}x}">
<field name="NUM">1</field>
</block>
</value>
<value name="Roughness">
<block type="math_number" id="O(Ljk},esz0i7#C^WGzW">
<field name="NUM">0.2</field>
</block>
</value>
<value name="Alpha">
<block type="math_number" id="D:%fWp90u=uM_5NU/!pg">
<field name="NUM">1</field>
</block>
</value>
<value name="BackFaceCulling">
<block type="logic_boolean" id="?1Vq|!UxQ!8@`~Nh+jrv">
<field name="BOOL">TRUE</field>
</block>
</value>
<value name="ZOffset">
<block type="math_number" id="#=`GmYgriBI8,fUN@eu?">
<field name="NUM">2</field>
</block>
</value>
</block>
</value>
<value name="DrawEdges">
<block type="logic_boolean" id="7@qVc:h.[KtAHHNv;u:h">
<field name="BOOL">TRUE</field>
</block>
</value>
<value name="EdgeColour">
<block type="colour_picker" id="`n4#B?VvrA-GrUw?JGaR">
<field name="COLOUR">#ffffff</field>
</block>
</value>
<value name="EdgeWidth">
<block type="math_number" id="?r:AQkGQo@y~!CJZR_E@">
<field name="NUM">2</field>
</block>
</value>
</block>
</value>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</statement>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
</next>
</block>
<block type="procedures_defreturn" id="U-ZYLrri*D+08,.93-Z)" x="549" y="114">
<mutation>
<arg name="face" varid="0dvp3:dj5bz%K/6-t#s+">
</arg>
</mutation>
<field name="NAME">makeUvParams</field>
<comment pinned="false" h="80" w="160">Describe this function...</comment>
<statement name="STACK">
<block type="variables_set" id="N;:rIBL-{t$/5u`PlgYW">
<field name="VAR" id="TC`ZX(-AgXb{8E~@6^u/">uvParams</field>
<value name="VALUE">
<block type="bitbybit.occt.shapes.face.subdivideToUV" id="{J(e+p(c[K~Di|``TrI9">
<value name="Shape">
<block type="variables_get" id="P|E/j~fY#2{pKscBO)~7">
<field name="VAR" id="0dvp3:dj5bz%K/6-t#s+">face</field>
</block>
</value>
<value name="NrDivisionsU">
<block type="math_number" id="cU?P#~wDiBNZ)2YD)WEL">
<field name="NUM">20</field>
</block>
</value>
<value name="NrDivisionsV">
<block type="math_number" id="|4qY-H!iudk7V|r:]N,+">
<field name="NUM">8</field>
</block>
</value>
<value name="ShiftHalfStepU">
<block type="logic_boolean" id="a3/7Xf4vyfoC;BobF?U-">
<field name="BOOL">TRUE</field>
</block>
</value>
<value name="RemoveStartEdgeU">
<block type="logic_boolean" id="TV:PlQS#^ZoAUY]nt1EV">
<field name="BOOL">FALSE</field>
</block>
</value>
<value name="RemoveEndEdgeU">
<block type="logic_boolean" id="Q]Pd5S[3It[ur;?i1x2a">
<field name="BOOL">TRUE</field>
</block>
</value>
<value name="ShiftHalfStepV">
<block type="logic_boolean" id="2I.*c*)kAaw[*w2Ky?a+">
<field name="BOOL">FALSE</field>
</block>
</value>
<value name="RemoveStartEdgeV">
<block type="logic_boolean" id="3^j.z#zaF_YVAQ^V%NVN">
<field name="BOOL">TRUE</field>
</block>
</value>
<value name="RemoveEndEdgeV">
<block type="logic_boolean" id="MYHk03,Tz(Se?O2nxCf[">
<field name="BOOL">TRUE</field>
</block>
</value>
</block>
</value>
</block>
</statement>
<value name="RETURN">
<block type="variables_get" id="1fu=4hb,I!WlU/oJ|!ef">
<field name="VAR" id="TC`ZX(-AgXb{8E~@6^u/">uvParams</field>
</block>
</value>
</block>
<block type="procedures_defreturn" id="nn1,}s5IR`5TwM:]a9~w" x="559" y="808">
<mutation>
<arg name="uvParams" varid="TC`ZX(-AgXb{8E~@6^u/">
</arg>
<arg name="srf" varid="2^Q-N!%M(5QY*3,SjZjY">
</arg>
<arg name="ellipseMinor" varid="-?PFj;sqp]dunhz|[/PQ">
</arg>
<arg name="ellipseMajor" varid=")D|z+SUVIRkTL.Wg(m]~">
</arg>
</mutation>
<field name="NAME">ellipsesOnSurface</field>
<comment pinned="false" h="80" w="160">Describe this function...</comment>
<statement name="STACK">
<block type="variables_set" id="%0HWfzU[dP@9YcsApSl~">
<field name="VAR" id="#|0hz9A,rSrp.T]4,1Hk">ellipsesOnSurface</field>
<value name="VALUE">
<block type="lists_create_with" id="jW%SV@V./kHxu!9Z)I7J">
<mutation items="0">
</mutation>
</block>
</value>
<next>
<block type="controls_forEach" id="-#RYa+#?a~;(ng0$U!g9">
<field name="VAR" id="4td}#E)?F*lX^:2WOINn">i</field>
<value name="LIST">
<block type="variables_get" id=":P5B=zk_b[,p2Fh|r}=[">
<field name="VAR" id="TC`ZX(-AgXb{8E~@6^u/">uvParams</field>
</block>
</value>
<statement name="DO">
<block type="lists_setIndex" id="q!zb1Q{hGFAAJDbS5Bx/">
<mutation at="false">
</mutation>
<field name="MODE">INSERT</field>
<field name="WHERE">LAST</field>
<value name="LIST">
<block type="variables_get" id="Tti($kT@~#=WW{FlYp1y">
<field name="VAR" id="#|0hz9A,rSrp.T]4,1Hk">ellipsesOnSurface</field>
</block>
</value>
<value name="TO">
<block type="bitbybit.occt.shapes.wire.combineEdgesAndWiresIntoAWire" id="!DqS]1}9Sss[=LjRBMot">
<value name="Shapes">
<block type="lists_create_with" id="b,rzV)(=v{vIB%pL=[zx">
<mutation items="1">
</mutation>
<value name="ADD0">
<block type="bitbybit.occt.shapes.edge.makeEdgeFromGeom2dCurveAndSurface" id="=`oNnzI9T}4,ASv{/;[q">
<value name="Curve">
<block type="bitbybit.occt.geom.curves.geom2dEllipse" id="B]l2{Q[S4=tMGQL{fS45">
<value name="Center">
<block type="variables_get" id="JCbe93HRt%QSKb%Olpk/">
<field name="VAR" id="4td}#E)?F*lX^:2WOINn">i</field>
</block>
</value>
<value name="Direction">
<block type="bitbybit.vector.vectorXY" id="-{E/pK6+g0c8bY~.WA~^">
<value name="X">
<block type="math_number" id="f=Ny_j6y-wC5l%bufL@4">
<field name="NUM">0</field>
</block>
</value>
<value name="Y">
<block type="math_number" id="7Ilu8s8RKl,bRTHM0#!;">
<field name="NUM">1</field>
</block>
</value>
</block>
</value>
<value name="RadiusMinor">
<block type="variables_get" id="V,JU?0yl#TRO~{:2eoki">
<field name="VAR" id="-?PFj;sqp]dunhz|[/PQ">ellipseMinor</field>
</block>
</value>
<value name="RadiusMajor">
<block type="variables_get" id="-WFWNf=0q(NJtGttzY8v">
<field name="VAR" id=")D|z+SUVIRkTL.Wg(m]~">ellipseMajor</field>
</block>
</value>
<value name="Sense">
<block type="logic_boolean" id="yCyI|(Q)rO-Bij#4uXf9">
<field name="BOOL">TRUE</field>
</block>
</value>
</block>
</value>
<value name="Surface">
<block type="variables_get" id="J=eyRwnTcQ[JI/Z8ffTg">
<field name="VAR" id="2^Q-N!%M(5QY*3,SjZjY">srf</field>
</block>
</value>
</block>
</value>
</block>
</value>
</block>
</value>
</block>
</statement>
</block>
</next>
</block>
</statement>
<value name="RETURN">
<block type="variables_get" id="cr!}`xNk^Y~NY:k+Y~#=">
<field name="VAR" id="#|0hz9A,rSrp.T]4,1Hk">ellipsesOnSurface</field>
</block>
</value>
</block>
</xml>
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