Cylindrical image mapping problem

I'm working on a form generating script for a Canstruction project, and I want to add a bit of realism, so I'm trying to map a can label onto a mesh cylinder. But I just can't get the image to cohere. Any ideas of what I'm doing wrong here?

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Permalink Reply by djordje on December 18, 2012 at 11:33am

Hi Paul,

I can not help you with solving this problem in Grasshopper.
But you can definitively solve it in Rhino, in this way:

0) Bake your cylinder from Grasshopper.

1) Select it in Rhino

2) In the Properties drop box menu (on the right) choose "Material".

3) Choose "Basic" from the radio buttons below

4) Check "Texture"'s checkbox

5) Define your texture "Map file". In your case, use "Carrots small.jpg" file.

Permalink Reply by Florian Frank on December 18, 2012 at 11:53am

Hi Paul,

it's easy...once you know how the image sampler works...its confusing sometimes.

You have to input point coordinates that corrispond to the pixel coordinates on the picture and not those from the mesh directly. See pic above.

You can imagine it as a UV map. I've added the display for the points with the same color on the construction plane. So you see how these point coordinates are beeing mapped onto the cylinder.

Cheers FF

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MappingStudy.gh, 101 KB

Permalink Reply by djordje on December 18, 2012 at 12:14pm

Very nice Florian.
Thank you!

Permalink Reply by Paul Morel on December 18, 2012 at 12:22pm

Thanks dude!

Permalink Reply by Florian Frank on December 18, 2012 at 12:25pm

your welcome...just for interest...why do you need this as a vertex color on the mesh? are you going to print it with the zcorp or some crazy shit??? ;-)

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