Possible confusion with cross reference

Replies to This Discussion

Permalink Reply by Hannes Löschke on April 3, 2013 at 2:04pm

Your definition is all right. It's your coordinate space, that's wrong. Here's how to create the bowl with a better UV grid for your task.

Attachments:

• FruitBowl_2April2013_UV.3dm, 105 KB
• FruitBowl_2April2013_UV.gh, 9 KB

Permalink Reply by david b golding on April 3, 2013 at 2:29pm

Thanks Hannes,

 

I'm hoping you didn't change the 3dm. file as I couldn't open that - I'm still on Rhino4!

 

Thank you for your version, I  had something similar set up in the first place, but thought that it was a bit wasted and over-kill. Can you explain why it is good practice to set it up  like that?

I'm still not 100% sure that the aesthetic is right. I imagined the pattern to be muh more symmetrical and central. 

 

I think I might try extruding the surfaces after they have been mapped . . .

Permalink Reply by Hannes Löschke on April 3, 2013 at 2:44pm

The rhino fil was actually the key... so here you go.

Your spiral is constructed on a cartesian coordinate system. When you create a surface by rotation, the UV coordiantes will resemble a polar sytem. So the spirals center will be projected to the UV cross point on the left. X coordinates will go along the radials while Y coordiantes wil lbe wrapped around the circumference. The bolder line to the right is actually the seam, where the extremes of the UV "plane" are joined to get a closed surface.

I constructed a sweep2 surface from sections of the inscribed circle of your bowl. The sweep will create a subsection of the sphere with an almost rectangular UV grid.

Attachments:

• FruitBowl_2April2013_UV_4.3dm, 105 KB

Permalink Reply by david b golding on April 4, 2013 at 12:34pm

Thanks Hannes.

 

Just to make sure, is this the aesthetic you recieved?

I want to create a spiral aesthetic on the surface of the bowl, so if this is what you saw as well, I think I will go back a few stages and re-work it.

 

I did something similar to this a while back now, when Cross Reference was an option on each function, so it may still have something to do with that. . .but to be honest, I never really understood why it worked.

 

Here is a grab from that pice of work,

Anythoughts?

 

Dave

Permalink Reply by david b golding on April 4, 2013 at 1:07pm

OK, So I have just figured it out!!

I totally get what you are saying now Hannes!

Thanks for putting me on the right track!

Really appreciate it,

Dave.