https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279267#M3311 For some reason it won't work with REVOLVE.<BR /> Instead use REVOLVE{2}, then everything is fine. Tue, 29 Jun 2021 11:22:28 GMT runxel 2021-06-29T11:22:28Z https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279266#M3310 <DIV class="actalk-migrated-content">I'm trying to make object with complex wholes. To simplify that made that with basic figures, but as i see subgroup works fine only when revolve's angle =360. Otherwise i see no effect. I was hoping that if j=1 in mask (closed top, side surfaces it), programme would consider that this object is closed/whole, same as when angle 180.<BR /> <PRE><I> </I>project2 3,270,2 !please in settings make 3D as wired - to see holes inside blocks model solid pen 1 building_material 10 !concrete - just to see fill in section view group "solid block" add -0.25*a,-0.5*b,-0.5*zzyzx block A,B,ZZYZX endgroup group "revolve romb 360" si=1 put 0,0,si put A*0.25, B*0.25, si put A*0.5, 0, si j1=1: j2=1: j3=1: j4=1: j5=1: j6=1: j7=1: j8=0: j9=0 maskRevolve = j1 + j2*2 + j3*4 + j4*8 + j5*16 + j6*32 + j7*64 + j8*128 + j9*256 revolve nsp/3, 360, maskRevolve, get(nsp) endgroup result = subgroup ("solid block", "revolve romb 360") placegroup result group "revolve romb 180" model solid si=1 put 0,0,si put A*0.25, B*0.25, si put A*0.5, 0, si j1=01: j2=01: j3=01: j4=01: j5=01: j6=01: j7=01: j8=01: j9=01 maskRevolve = j1 + j2*2 + j3*4 + j4*8 + j5*16 + j6*32 + j7*64 + j8*128 + j9*256 revolve nsp/3, 180, maskRevolve, get(nsp) endgroup add A*2,0,0 result3 = subgroup ("solid block", "revolve romb 180") ! HAS NO EFFECT - second cube remains the same, without any hole placegroup result3 del top </PRE> </DIV> Tue, 14 Sep 2021 07:04:02 GMT https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279266#M3310 A_ Smith 2021-09-14T07:04:02Z https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279267#M3311 For some reason it won't work with REVOLVE.<BR /> Instead use REVOLVE{2}, then everything is fine. Tue, 29 Jun 2021 11:22:28 GMT https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279267#M3311 runxel 2021-06-29T11:22:28Z https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279268#M3312 Yeah, you're right. Thank you Tue, 29 Jun 2021 12:25:53 GMT https://community.graphisoft.com/t5/GDL/substract-from-block-with-help-of-revolve-if-angle-360/m-p/279268#M3312 A_ Smith 2021-06-29T12:25:53Z