Rhino CPlane in Wrong Position

Hey,

By now, I am sure you've noticed that I am a novice and very new to Rhino and Grasshopper - three blog posts already!

Anyway, I've got this problem which I really cannot seem to solve. I attended the Intro to Grasshopper Webinar with David Rutten on Thursday 9th of December. There, he showed an example of how to project section planes into a building. Now, I am trying to do the exact same thing.

In his case, one of the corner of his building touched the Origin Point of the CPlane, and seeing that he used the XYZ Vector component in order to porject the section planes on the Z-Axis the section planes automatically were projected from the origin point along the facade of the building. This is where my problem lies!

My CPlane is very far from my model, and I have tried to set the Origin Point to the edge of my building, but it just own't work. I even tried setting the CPlane to Object and CPlane by Three Points, and none worked.

Please, see images for a clearer description of the issue. The above image is David Rutten's example and the nether image is my model.

Thanks

Marios

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Comment by Marios on December 13, 2010 at 10:20am: Danny Boyes,

I did as you showed me and it worked :) I have now the floor planes exactly where I want them.

Thank you so much

Marios

Comment by Marios on December 13, 2010 at 8:44am: Thank you Danny Boyes,

I will follow your solution and see if the problem can be solved :)

Comment by Danny Boyes on December 13, 2010 at 5:40am: All Planes in Grasshopper are in World Co-ordinates, so manually setting the CPlane in Rhino won't help. However, you should still be able to use the Rhino Origin to carry out what is needed, ie, Plane|BRep intersection as those planes are infinite, what you see on screen is only a representation of them and if you wanted to change how large you view them there is a setting for Plane Radius in the View Menu, close to the bottom.

Alternatively you can set a plane anywhere by supplying a co-ordinate to that plane's input. For example: put a bounding box around your geometry in GH and extract the lowest point from one of the corners by Exploding the BRep.

Here I have used the Bounding Box, Explode (Brep), List Item (default 0), XY Plane, Series, Z, Move and BRep|Plane components.

[Draw Icons and Fancy Wires from the View menu are turned on]