How to do 3D blocking for such a geometry
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I have been trying out different possible ways of blocking to follow the geometry. could anyone suggest me with any ideas ?

two methods
Method 1:
Follow the 2d pipe junction and also see this video : https://vimeo.com/86772893 Method 2: create one block for the larger pipe and make splits at the junction. Now create block from four vertices 
@ Far .. Why is it to hard to move vertices for a 3d blocking when compared to 2d planar block. I assume due to the dimensions of the geometry. Is there any other way to move the vertices freely for a 3d block

@Far
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I have uploaded the tin file. I am unable to create the block using the 4 vertices. Could you once have a look

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Hallo Far,
I have gone through your blocking. Could you explain me how did you manage to get so many points on the circles . 
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