3D view facing North

[Anonymous]

Hi

After a while I have started on the automatic 3D views creation again, still with no luck.

The North direction is still wrong.

When I use the eye, Up, Forward settings as below, North is turning Right insted of up

XYZ eye = new XYZ((SecBMin.X + SecBMax.X) / 2, (SecBMin.Y + SecBMax.Y) / 2, 1); // in the middle of the section box

XYZ up = XYZ.BasisY;
XYZ forward = XYZ.BasisZ;

If I swap the Up and Forward Z/Y:

XYZ eye = new XYZ((SecBMin.X + SecBMax.X) / 2, (SecBMin.Y + SecBMax.Y) / 2, 1);

XYZ up = XYZ.BasisZ;
XYZ forward = XYZ.BasisY;

Now I got the direction right, but the eye target is not placed in the midtel af the outer walls don't seem prarallel.

What do I do wrong ?

Isn't it possible to create a 3D perspective facing North ?

If not, is it possible to rotate the view after creation ?

Best Regards

Anders

[jeremytammik]

Dear Anders,

Thank you for your query.

I cannot say off-hand what might be wrong, but I am certain that you can create the view oriented in the manner you need.

Have you taken a look at The Building Coder topic group on Creating and Setting Up a 3D View?

http://thebuildingcoder.typepad.com/blog/about-the-author.html#5.37

I hope some of the discussions and examples there help resolve the issue.

Please let us know how you end up solving this and what the problem was.

Thank you!

Best regards,

Jeremy

[Anonymous]

Hi Jeremy

I have tried, and the view is perfect with crop, eye Target etc, if it is in the right direction !!

The 3D view have settings like this

Up Direction         (-1, 0, 0)

Right Direction     (0, 1, 0)

View Direction     (0, 0, 1)

When I manualy correct the view with Top facing North

The settings look like this

Up Direction         (-1.57009245868378E-16, 1, -2.20937357914267E-16)

Right Direction     (1, -1.57009245868378E-16, -1.53018136212116E-31)

View Direction     (1.18328928261845E-31, 2.20937357914267E-16, 1)

Can you get something out of those settings ?

For you information, We started the subject at:

http://forums.autodesk.com/t5/revit-api/setting-3dview-to-topview-and-north-upwards/m-p/5612946#M979...

Best Regards Anders

[jeremytammik]

Dear Anders,

Thank you for your update.

You understand the exponential notation xxxE-16, where x are digits, I assume?

E-16 and E-31 means 'multiplied by 10^-16' and 10^-31, respectively.

In other words, very small numbers indeed.

In other words, these numbers can be equated with zero.

In other words, the manually generated settings are

  Up Direction     (0, 1, 0) = XYZ.BasisY
  Right Direction  (1, 0, 0) = XYZ.BasisX
  View Direction   (0, 0, 1) = XYZ.BasisZ

Does that help?

Did you look at the background documentation that I pointed to responding to your other related query?

http://forums.autodesk.com/t5/revit-api/setting-3dview-to-topview-and-north-upwards/m-p/5612946

The description of the views in the developer guide:

Welcome to Revit 2016 Learning

http://help.autodesk.com/view/RVT/2016/ENU

Revit API Developers Guide

http://help.autodesk.com/view/RVT/2016/ENU/?guid=GUID-F0A122E0-E556-4D0D-9D0F-7E72A9315A42

Basic Interaction with Revit Elements

http://help.autodesk.com/view/RVT/2016/ENU/?guid=GUID-54D8EFF1-5274-43D8-BD0C-68209F36BBD2

Views

http://help.autodesk.com/view/RVT/2016/ENU/?guid=GUID-A7CE4D5C-8839-4CD8-817F-BE8B17F91D97

View3D

http://help.autodesk.com/view/RVT/2016/ENU/?guid=GUID-A7FA8DBC-830E-482D-9B66-147399524442

I hope this helps.

Best regards,

Jeremy

[Anonymous · Accepted solution]

Hi Jeremy

Finally I got I right 

I am not sure it is "by the book" but it is working 

I  put in an negativ value in the XYZ forward, then all the 3D view are in the right view, facing North.

XYZ eye = new XYZ((SecBMin.X + SecBMax.X) / 2, (SecBMin.Y + SecBMax.Y) / 2, 1); // Center of the sectionBox
XYZ up = XYZ.BasisY;
XYZ forward = -XYZ.BasisZ;

view.SetOrientation(new ViewOrientation3D(eye, up, forward));

Then I locked the view 

view.SaveOrientationAndLock();

and at last set the eye and target elevation to the right value

Parameter EYE_ELE = view.get_Parameter(BuiltInParameter.VIEWER_EYE_ELEVATION);
EYE_ELE.Set(....

Parameter Tar_ele = view.get_Parameter(BuiltInParameter.VIEWER_TARGET_ELEVATION);
Tar_ele.Set(.....

Have a nice weekend

Anders