Help needed with a model based on Image Sampler: architectural stuff!

Ok,

As you can see in the ghx, the model molds to shape with help of the (contrast-)image put in Image Sampler.

I'm wondering why my model (that has a (morfing) grid-overlay) deviates from the surface it originated from. For instance with a simple gradient image of a cross, a 'church', the model shows inward deviations around the left and right 'wing', which are not meant to be. Also, the overlaying pattern is not distributed evenly around its surface.

Can anyone perhaps explain to a beginner as myself why the code does this and how it will be possible to get detailed results while using more complex gradient-images.

Hope to learn something new and helpful!

Attachments:

Try 07-15 4.jpg, 288 KB
Image Sampler Shape - Church.gh, 3.6 MB

Replies to This Discussion

Permalink Reply by Dont Ask on July 19, 2013 at 8:26am

This is the cross image, I forgot.

Attachments:

try 6.png, 897 KB

Permalink Reply by Dont Ask on July 21, 2013 at 7:11am

A kick for the boards; can anyone help?

Permalink Reply by David Rutten on July 21, 2013 at 8:40am

You're interpolating your samples which results in a weird surface to begin with.

Aren't all subsequent oddities just a result of this wonky nurbs?

David Rutten

david@mcneel.com

Tirol, Austria

Permalink Reply by Dont Ask on July 21, 2013 at 10:50am

I see, is it easy to set up a mesh that makes up for the surface? I have no clue how to make a mesh that uses my samples..

Permalink Reply by David Rutten on July 21, 2013 at 11:24am

Would it perhaps make the most sense to create your lines on the floor and then move the end-points according to the image?

David Rutten

david@mcneel.com

Tirol, Austria

Permalink Reply by David Rutten on July 21, 2013 at 11:37am

Like so:

David Rutten

david@mcneel.com

Tirol, Austria

Attachments:

moveafterthefact.gh, 3.1 MB

Permalink Reply by Dont Ask on July 21, 2013 at 1:04pm

Thats exactly what I meant, thanks! I think what you propose is more sensible though. I have tried but can only come so far:
(btw how does that nifty preview feature work in Grasshopper?)
As you see, the pattern doesnt follow the loft surface.. how come?

Permalink Reply by Dont Ask on July 21, 2013 at 1:15pm

With GHX this time!

Attachments:

Image Sampler Shape - Church.gh, 3.6 MB

Permalink Reply by David Rutten on July 22, 2013 at 3:51am

The nifty preview is only for exporting. Press Ctrl+Q to create one of those images.

I don't understand what "the pattern doesn't follow the loft surface" means though.

David Rutten

david@mcneel.com

Tirol, Austria

Permalink Reply by Dont Ask on July 22, 2013 at 4:08am

Hi David, if you observe the Rhino image you will see that the 'under'laying pipe pattern does not wrap itself around the surface that I lofted previously.. Is this a result of my loft settings (namely: 'straight' instead of 'normal')?

Oh and thanks for showing how the preview thing works.

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