draw 3d poly not on main access
I need to draw a complex shape in 3D space for future push or extrusion. What I do fails to create a uniform plain in space . Any advice or link to tutorials will be most appreciated
Ruvy
Comments
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As I'm sure you are aware, while only three points are required to define a plane, multiple points are not necessarily coplanar. It's not entirely clear to me what you're attempting to define. Perhaps a drawing would help?
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@Ruvy
Do not create a 3D polyline but use a 'normal' polyline, which can be created on any plane in 3D space, instead.0 -
Same Problem here.
Imported Geoemtry. Is "Surface" instead of Solid - as they are missing some faces
to close the Volume. So I exploded Surface to Regions and tried to draw a
standard Polyline to create a "3D Polygon".Those "2D-like" Regions aren't suitable for establishing a wanted DUCS.
Could be that Adaptive Grid is heavily counteracting drawing here,
but what I miss is a way to draw 2D-like Objects free in 3D Space by
Entity Snapps.
If DUCS does not work, do I really need to set an UCS first ?
Or is there a way that just my first three 3D Entity Snaps will define
the orientation in Space ?In this case I would basically just need Rectangles to close my holes.
In VW, 2D Objects basically draw only in XY plane, or DUCS or Screen Plane.
So it has an additional "3D Polygon" Tool that draws by snapping to any
3D Entity points in 3D Space.So what would be the best Bricscad Workflow,
to draw something 2D Rectangle on available Snapping Points from Region's
Vertices, free in 3D Space.0 -
Model : Meshes : 3D Polygon (DUCS OFF)
does basically do what I want.
But somehow it shows Entity Snap Symbols but does not exactly
snap to these points. Just somewhere near.0 -
Don't know what happened to Snapping ?
I can only about 15% of snap attempts to really snap to
a Regions Corner, with 3D Polygon Tool.In this case I can close my Holes best with
Direct Modeling : Extrude Edge0 -
@Michael Mayer
I do not recognize the '3D polygon' command/tool.
In the Meshes submenu I do see a '3D face' and a 'Polygon mesh' entry.It may help if you post a dwg.
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Sorry, of course, it is 3D Face ....
My 2D Polyline snap problems may be just related to DUCS OFF,
Negative Z Snap setting and finally being forced to XY Layer plane.
But I don't get what happens to Entity Snaps with 3D Face snapping
on Regions.0 -
@Michael Mayer
While hovering over a region the DUCS does not kick in (strange!) so the only settings I can think of that may cause your problems are OSNAPZ and Snap Tracking.
Note that a 3D face with 4 points need not be planar.0 -
In this case they are real rectangles and planar.
Beams of a broken steel stair that miss one or more top or bottom caps.
Basically all vertical.
DUCS won’t work as I would need the missing face to align ...
I have to retry with lines or solids instead of regions for 3D Face snapping.An example for my situation would be just a rectangular solid.
Explode, delete one Face, maybe convert to regions if needed.
Finally try to recreate the missing Face, either with
something 2D or a 3D Face.0 -
@Richard Webb said:
As I'm sure you are aware, while only three points are required to define a plane, multiple points are not necessarily coplanar. It's not entirely clear to me what you're attempting to define. Perhaps a drawing would help?Thank you Richard and Roy. Yes, I am aware... Let me try to better explain my issue. I am trying to create a rather rather complicated vertical shape for future sweeping along center access of a road that is curved both horizontally and vertically. looking on it in top vies this shape is angular to X&Y coordinates.. Drawing it in place I fail to control verticality of lline so it never gets to a point where all point are co-planar. So question is really how to lock to Z.
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@Ruvy said:
So question is really how to lock to Z.Like Vectorworks, Bricscad seems to lack a real 3rd Axis Lock in XZ or YZ plane.
It works ok in XY. They are both "2.5D".
Meaning XY plane is preferred plane, not all 3 Axes or planes are treated equally.
(Which is generally quite useful in Architecture, which mostly happens in
XY and is just extruded in Z)I think you first have to enable "ignore entity snap elevation" to force
to project Snap points from Z to XY Layer Plane "Elevation".
While "XY Layer Plane" depends on current UCS or DUCS.
(I think it works in a Top View (with 2D Wireframe Mode only ?) too)So for your Drawing in Place you will need to establish such circumstances,
meaning to place XY in Space where you need it,
either by defining a UCS or getting picking a suitable DUCS and locking it by
SHIFT key.
Drawing in XY Top View and re-aligning your profile may be faster.0 -
@Michael Mayer said:
An example for my situation would be just a rectangular solid.
Explode, delete one Face, maybe convert to regions if needed.
Finally try to recreate the missing Face, either with
something 2D or a 3D Face.I tested that simple example and the first try worked fine.
But when I try again and look more closer, there is a problem.
(Maybe just on v19 Mac)
Maybe because of Adaptive Grid in general.
It may not be always, but in many cases there is definitely a
priority of (Adaptive) Grid Snap over Entity Snaps.
And when I show my Snap Aperture, I can't snap to a Entity Snap
as long as a potential Grid Point, at my current dynamic Grid Resolution,
inside of the Aperture Box.
It seems to even prevent the Entity Snap Cursor Cues from appearing
in many cases.Not sure if that is a Problem with Regions and some other special
Geometry Types only, but I am sure that needs some Fine Tuning.(Same as Perpenicular Snap on an Entity Edge - far from any of its
Vertex Points, needs some priority over snapping to such Vertex,
without warning, with the final click)0 -
If it works for you, it is broken on Mac.
It doesn't even snap with Adaptive Grid OFF here ...BTW,
I customized my Adaptive Grid Resolution from 3 to 100 -
@Michael Mayer
Working with snap switched on in 3D is indeed tricky.3 remarks:
- The grid display may be set to adaptive (or 'dynamic' as you call it), but the snap units are fixed. You seem to suggest otherwise.
- If snap is on, the cursor becomes 'jumpy' and this can prevent you from accurately hovering over an entity to acquire an object snap (esnap) point. This is one of the reasons why I would not have snap on by default.
- The keyboard shortcut for toggling snap is Ctrl+B.
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I have (grid) snap off most of the time.
But if Adaptive Grid is on, it will overwrite "SNAP" OFF
and do a grid snap, but to the adaptive grid.It does not seem to be related though as it behaves the same when
I deactivated Adaptive Grid and have Snap Off.And as I see snapping with 2D Polylines or 3D Face in 3D works fine
on Solids. But when I explode my Solid to Regions, to delete one Face,
entity snapping get havoc.
Haven't tried if the same is true for a Mesh Object or a Surface object,
or if it works in v18 Mac0 -
OK I tried in v18 Mac and it works fine,
when drawing 3D Face on Regions from exploded Solids.will SR ...
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According to the V19 Release Notes that version indeed has 'an adaptive snap step size'. I am still on V18.
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Yes, you have to look at the whole new v19 adaptive grid system.
It is great.
Adaptive Grid Step Size is just a sub-setting to scale the grid steps
according to your zoom level. I prefer it a bit more coarse or
restrictive grid size to force "nice numbers" than the default
setting value of 3 (I use 8-10)
https://www.youtube.com/watch?v=57VFM54Tr1Ahttps://blog.bricsys.com/new-bricscad-v19-adaptive-grid-snap/
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@Michael Mayer said:
OK I tried in v18 Mac and it works fine,
when drawing 3D Face on Regions from exploded Solids.will SR ...
Is SR'ed.
And snapping inaccuracy happens in v19 Windows too.0
