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hencoop
en respuesta a: cadffm

@cadffm Maybe I don't understand you?  

I am using WORLD coordinates; I have used the command PLAN and set the viewport to WORLD;  Using DVIEW to check the target I see the angle from the XY plane is -90, and, the angle in the XY plane from the X axis is -90, The system variable AUPREC=8

 

I have just proven to my satisfaction that the cause of this problem is the DVIEW command.  Specifically, the following will jack up/down the values of TARGET and BACKZ:

(COMMAND "._dview" "" "tw" 3.44489 "").  I have a routine that calculates the desired angle and feeds it as a variable name instead of 3.44489 (or 3.444889250415612, the calc'd value to 16 places)

I tested this, it makes no difference whether each individual entry is manually keyed in at the command line or entered by an autolisp function as shown (whether angle is rounded to 4-places or not rounded at all).

 

What is [wrong with/designed into] DVIEW TWIST that it jacks the TARGET and BACKZ system variables?

 

Apparently, I cannot twist my viewport to this angle (and likely many other angles) without jacking TARGET and BACKZ and causing these jacked values to be assigned to objects operated on by CHSPACE.

 

Am I using DVIEW TWIST incorrectly?

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