@Phillip_McIntosh wrote:
Hi all, Now days I view myself as an intermediate level Rhino user but the one thing I have never got my head around is construction planes and viewing angles even though I have seen most of the videos on it. In normal situations I rarely have problems but lately I've been using a digisizing arm to import the control points and it always goes badly as far as the construction planes and viewing angles go. Once I get the correct methodology I'll be right but presently I waste hours if not days trying to get the views and planes to line up. Once I have my coordinates inside Rhino my method at present is as follows: Regardless of how complex the shape is I always digitise a rectangle (polygon actually) on the surface of the object as this gives me a reference to set my Cplane to. First I use "Planarize curve" on the rectangle then "set Cplane to object OR to 3 points" then "view normal to Cplane". As you can see in the attached screen shots, the Cplane and viewing angle in perspective is normal (other than the Z axis pointing downwards instead of up. (A) Anyone know how to fix this?). (B) The top & right views are normal but the front view has the sketch on an angle (i.e. not flat as per the right view). What caused this and how do I correct it? (C) In the second shot which is Top View with a true rectangle, you'll notice that the drawing sits on the screen on an angle yet "analyse" claims it is horizontal (0degrees) and also look at the XYZ thingy (coordinate triad?) at bottom left which is square to the screen. What's wrong and how do I correct this? (D) Although you don't see it here, most times I get the origin point correct in one view (bottom corner of the rectangle) but in other views the origin is nowhere near the rectangle. How do I correct this? Thanks in advance for your help.
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