UCS with a view and clipping planes

I have to adjust some existing saved views and can't
seem to get the ucs to work with respect to clipping
planes.

(command ".ucs" "3" "0,0" "1,0,0" "0,0,1") gets me close
to where I want to be but when I try and draw a line it
appears to be "behind" the clipping plane.

I can pick 3 points manually (using some existing line work
to establish the points) but I have about 50 views to "fix"
and would like to do this in one shot.

What is it that I am overlooking? Hope I explained this
well enough.

 

PS: (command "ucs" "v")

gives the same results.

 

Perhaps I could explain this a bit better. As an example,
I've got a 4 sided box (3d solids) that I need to view each
'wall' in elevation from the inside looking out.

I initially set up all these views manually and adjusted
clipping planes to obscure objects in front of and behind
the 'wall' I am viewing.

Now one of these walls have moved, so I need to redefine
the view and clipping planes.


Some questions:

Are clipping planes relative to the target point? If I adjust
the target point, should the clipping planes follow?
(I'm finding that not to be the case)

What does using the view option within the ucs command base
it's position on? (in and out of the paper).

 

Ok, try this:

(command ".rectangle" "0,0" "@20',20'")
(command ".extrude" (entlast) "" "6'-0" "")
(setq outter (entlast))

(command ".rectangle" "6,6" "@19',19'")
(command ".extrude" (entlast) "" "6'-0" "")
(setq inner (entlast))

(setq target '(6.0 120.0 0.0))
(setq camera '(6.25 120.0 0.0))

(command ".subtract" outter "" inner "")

(command ".dview" ""
"points" target camera
"clip" "f" "0.25"
"clip" "b" "-6.25"
""
)

(command ".ucs" "view")

(command ".zoom" "e")
(command ".zoom" ".95x")

(command ".view" "save" "test")

Now, draw a vertical line crossing the 'wall' and issue
the hide command. The line is placed behind.

Now, with ortho on do a 3 point ucs, for the first point
pick the bottom of the 'wall' using the near osnap then
pick a point in the x direction and pick a point in the
y direction.

Draw another vertical line and issue the hide command.
The line is now visible.

Question, how can I establish that 3 point ucs by using
the dxf codes defined in the saved view?

 

Let me understand this a little better.

You have existing views that are already DVIEW clipped, and you're trying to set a ucs to match the view AND reside within the clipped boundaries. Is that an accurate partrayal of your problem?

Build a macro to set the UCS ORIGIN to reside in the plane by selecting some point within the plane.

(defun c:ucor ()
(command "ucs" "v")
(command "ucs" "o" "*0,0,0")
(setq ptzo (GETPOINT "\nPick For UCS Z Elevation : "))
(command "ucs" "o" (list 0.0 0.0 (caddr ptzo)))
(princ)
)

 

Yes, that is accurate.

Was what I was after, thanks OC.

I will end up usnig this in the future just to avoid the
user pick point. Looks like the "o" option changed
to "m" at some point but both work.

(setq data (tblsearch "view" "test"))
(setq p (trans (cdr (assoc 12 data)) 0 1))
(command "ucs" "m" p)

--

Autodesk Discussion Group Facilitator

to match the view AND reside within the clipped boundaries. Is that an accurate partrayal
of your problem?

 

Glad to help. Yeah the ORIGIN changed to MOVE somewhere between r14 and 2002. The little routine I posted has been around since R10 or R11.

Ohhh... I like the little view read proggy. Never thought of that, thanks.

 

Have you seen the attached?

 

I've got something similar that I've used for a while
but never could quite figure out the origin thing, so
it was not complete but still helped in getting these
views setup.