Extrude Command with tape Angle ?

Sakko
Sakko
in 2D Drafting

Hi all,

Unfortunately it is difficult sometimes to describe matters without a Screenshot (a picture is worth of 1000...++++ words !)

I am extruding  an   4+  sided  closed planar Polyline (2D or 3D)  with  at  least ONE not CONVEX (CONCAVE)  vertex.

Command Sequence :

: Extrude
Select entities:
Entities in set: 1
Select entities:
Specify height of extrusion or [Direction/Path/Taper angle] <500>: T
Specify angle of taper for extrusion <315>: 45
Specify height of extrusion or [Direction/Path/Taper angle] <500>: 10

As you can see a Taper angle of 45 grad and a Height of 10 is used.

The result is a tapered Prisma (Frustum) with a horizontal Bottom (having the shape of the extruded Polyline)

and  a  horizontal Top having a smaller similar shape to the bottom.  So Long so good....

You can easily reproduce it!    Now the problem :

The vertexes that are concave at the basis don't come as vertices at the Top Face of the 3D Extruded Solid.

In other Words the imaginary enclosing Contour (edges) of the Top Face   i s  f i l l e t e d   with an arbitrary Radius

at the vertexes corresponding to the concave Basis vertexes !

SO, what do i do wrong ?

Do i miss a System Variable like LOFTPARAM or LOFTNORMALS or just a configurable feature of the extrude command ?

Thanks

Konstantin

 

PS. It's time for this forum to allow for small Screenshots to be able to explain and show things better !!!

concave

 

 

Comments

  • Roy Klein Gebbinck
    Roy Klein Gebbinck

    Konstantin a lot will depend on the shape and size of your polyline. You could try posting an entity list of your LWPOLYLINE so that others can use the lisp function (entmake) to recreate the polyline. This won't be very exact, but it might work.

    To get an entity list copy-paste this code on the command line:
    (entget (car (entsel)))
    and select your polyline.

    The result should look something like this:

    ((-1 . <Entity name: 026f9468>) (0 . "LWPOLYLINE") (5 . "636") (330 . <Entity name: 022254c0>) (100 . "AcDbEntity") (67 . 0) (410 . "Model") (8 . "Dim") (284 . 0) (100 . "AcDbPolyline") (90 . 5) (70 . 1) (43 . 0.0) (38 . 0.0) (10 -22677.9 2318.78) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -22680.0 2364.45) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -22620.9 2365.16) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -22620.6 2332.98) (40 . 0.0) (41 . 0.0) (42 . 0.226892) (10 -22639.8 2291.09) (40 . 0.0) (41 . 0.0) (42 . 0.0) (210 0.0 0.0 1.0))
  • Sakko
    Sakko

    Hi Roy and thanks for responding !

    Here is the Polyline entity list

    ((-1 . <Entity name: 03082000>) (0 . "LWPOLYLINE") (5 . "403") (330 . <Entity name: 03083720>) (100 . "AcDbEntity") (67 . 0) 
    410 . "Model") (8 . "0") (347 . <Entity name: 03083338>) (62 . 4) (284 . 0) (100 . "AcDbPolyline") (90 . 10) (70 . 1) (43 . 0.0) 
    38 . 0.0) (10 -2573.94 -21198.7) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -2573.94 -24235.8) (40 . 0.0) (41 . 0.0) (42 . 0.0) 
    10 -1825.64 -24235.8) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -1825.64 -25775.2) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -6398.62 -25775.2) 
    40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -6398.62 -25054.1) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -4929.72 -25054.1) (40 . 0.0) (41 . 0.0) 
    42 . 0.0) (10 -4929.72 -22724.2) (40 . 0.0) (41 . 0.0) (42 . 0.0) (10 -5705.74 -22724.2) (40 . 0.0) (41 . 0.0) (42 . 0.0) 
    10 -5705.74 -21212.6) (40 . 0.0) (41 . 0.0) (42 . 0.0) (210 0.0 0.0 1.0))
  • Sakko
    Sakko

    Roy,  you can reproduce the extruded solid created

    my command sequence is

    _extrude
    Select entities:
    Entities in set: 1
    Select entities:
    Specify height of extrusion or [Direction/Path/Taper angle] <1000>: t
    Specify angle of taper for extrusion <315>: 45
    Specify height of extrusion or [Direction/Path/Taper angle] <1000>:

    and the produced entity has the following entity list

    just reproduce it with (entmake EntityList)

    ((-1 . <Entity name: 031cfb60>) (0 . "3DSOLID") (5 . "456") (330 . <Entity name: 0ec26a68>) (100 . "AcDbEntity") (67 . 0) (410 . "Model") (8 . "0") (347 . <Entity name: 0ec26680>) (62 . 3) (284 . 0) (100 . "AcDbModelerGeometry") (70 . 1) (1 . "700 0 1 0 ") (1 . "@33 Open Design Alliance ACIS Builder @14 ACIS 21.0.2 NT @24 Fri Jul 15 10:03:04 2011 ") (1 . "1 9.9999999999999995e-007 1e-010 ") (1 . "body $-1 -1 $-1 $1 $-1 $2 #") (1 . "lump $-1 -1 $-1 $-1 $3 $0 #") (1 . "transform $-1 -1 1 0 0 0 1 0 0 0 1 -6645.871601711784 0 0 1 no_rotate no_reflect no_shear #") (1 . "shell $-1 -1 $-1 $-1 $-1 $4 $-1 $1 #") (1 . "face $-1 -1 $-1 $5 $6 $3 $-1 $7 forward single #") (1 . "face $-1 -1 $-1 $8 $9 $3 $-1 $10 forward single #") (1 . "loop $-1 -1 $-1 $-1 $11 $4 #") (1 . "plane-surface $-1 -1 $-1 -3799.9084467894722 -23559.153913641054 1000 -3.4992294850189391e-030 -3.8355965508956372e-030 1 1 0 3.4992294850189391e-030 forward_v I I I I #") (1 . "face $-1 -1 $-1 $12 $13 $3 $-1 $14 forward single #") (1 . "loop $-1 -1 $-1 $-1 $15 $5 #") (1 . "plane-surface $-1 -1 $-1 -2573.9416874070162 -21198.700779253923 0 0.70710678118654857 0 0.70710678118654657 0 1 0 forward_v I I I I #") (1 . "coedge $-1 -1 $-1 $16 $17 $18 $19 reversed $6 $-1 #") (1 . "face $-1 -1 $-1 $20 $21 $3 $-1 $22 forward single #") (1 . "loop $-1 -1 $-1 $-1 $23 $8 #") (1 . "plane-surface $-1 -1 $-1 -2573.9416874070162 -24235.839021167354 0 0 0.70710678118654635 0.70710678118654879 -1 0 0 forward_v I I I I #") (1 . "coedge $-1 -1 $-1 $24 $25 $26 $27 forward $9 $-1 #") (1 . "coedge $-1 -1 $-1 $28 $11 $29 $30 reversed $6 $-1 #") (1 . "coedge $-1 -1 $-1 $11 $31 $32 $33 reversed $6 $-1 #") (1 . "coedge $-1 -1 $-1 $34 $35 $11 $19 forward $36 $-1 #") (1 . "edge $-1 -1 $-1 $37 -1.5707963267948966 $38 -1.0252945668175664 $18 $39 forward @7 unknown #") (1 . "face $-1 -1 $-1 $40 $41 $3 $-1 $42 forward single #") (1 . "loop $-1 -1 $-1 $-1 $43 $12 #") (1 . 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  • Sakko
    Sakko

    Roy,

    the better method to reproduce the Extruded Solid is the following

    ACIS Code that i produced using the acisout command in Bricscad.

    Just copy the provided code into a text file and save as  ExSol.sat

    Then imort the file into Bricscad with the command acisin !

    Now you can see the Solid

    700 0 1 0 
    @33 Open Design Alliance ACIS Builder @14 ACIS 21.0.2 NT @24 Fri Jul 15 10:42:36 2011 
    1 9.9999999999999995e-007 1e-010 
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  • Roy Klein Gebbinck
    Roy Klein Gebbinck

    Konstantin, the shape you are trying to extrude and the result you probably want to achieve, are very similar to the hipped roof in this 'how-to':
    An easy way to draw a 3d roof

    But instead of 'sharp' valleys, as in the how-to, Bricscad produces smooth transitions that are like segments of the inside of an inverted cone. I have tried playing around with the variables you mention but was unable to get a different result. But I have very little 3D experience, so somebody else may know better.But you probably can get the same result by adding several separate solids, but that would be a lot more work.

    Regards, Roy.

    P.S. For others who want to import the ACIS file in post #5: Make sure there is an empty line after 'End-of-ACIS-data'.

  • Sakko
    Sakko

    Roy ,  I am aware of this Tip Thanks !  meanwhile there is an update at

    http://topcadexperts.net/blog/2009/05/17/hip-tip-3d-roof-in-autocad-20042010/

    As you propably have noticed my polyline comes from this tip...

    Anyway I installed Bricscad 10 to experience the same problem and deinstalled it.

    So now all of a sudden the problem doesn't exist any more and I can follow this tip without any problem !

    in AutoCAD and Bricscad.  I don't know why ??

    It is propably something undocumented or subtile...who knows

    Maybe Bricsacad support. I would appreciate an answer if any

    Thanks, Regards

    Konstantin

This discussion has been closed.