map a graph

Replies to This Discussion

Permalink Reply by Hannes Löschke on March 3, 2012 at 3:28am

I'd try some vectorization program like illustrator...

The color scheme is hard to sort out and the grid confuses the image sampler component so it's hard to extract a height field to begin with.

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Permalink Reply by Giulia Arcadi on March 3, 2012 at 3:33am

thanks for the suggestion, however, it's possible to hide the grid and have the image as clean as this.

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Permalink Reply by Hannes Löschke on March 3, 2012 at 3:39am

if you have control over the image, can you apply a different gradient and save in a lossles format such as PNG?

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Permalink Reply by Giulia Arcadi on March 3, 2012 at 3:50am

yes,i can save the image in PNG format.

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Permalink Reply by Hannes Löschke on March 3, 2012 at 4:37am

JPG introduces some heavy artefacts, that make isocurve extraction difficult.

Here's a rather dirty shot at the problem.

Height is derived from hue. hue values wrap around halfway through the colors. that's why I had to remap the values to create continuous height values. Sure are better approaches for that.

After creating the height surface, I extract contour curves as a proof of concept. It would be better to intersect the surface only at heights where points were present.

Attachments:

• height_mapping.gh, 288 KB

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Permalink Reply by Giulia Arcadi on March 6, 2012 at 2:07pm

thanks a lot .. this is a good option for plan surfaces ...if I had a three-dimensional surface such as this there would be a way to draw the curves follow the colors?

This is an helicoidal surfaces and the graph with color it's exported by a software FEM for static analysis but I would like to obtain curves that are resistant beams.

This is the surface.

Attachments:

• 1.pdf, 309 KB
• 2.pdf, 318 KB
• 3.pdf, 290 KB

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Permalink Reply by taz on March 6, 2012 at 2:14pm

Most FEM software should be able to display results as stress contours.  Is that what you're after?

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Permalink Reply by Giulia Arcadi on March 6, 2012 at 2:35pm

yes, i need to continuous curves but this software display the results as graphs or vectors indicating the direction of the curves

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Permalink Reply by Hannes Löschke on March 6, 2012 at 4:14pm

Looking at the PDFs I can see, they are a very dense set of triangles.

It seems you have access to the program generating the pictures. Can't you export the mesh geometry?

Permalink Reply by Giulia Arcadi on March 7, 2012 at 2:35am

To make analysis in SAP2000 I need a mesh, preferably quad

I create it with rhino and then I import it in Sap2000 ... after the static analysis I can only export data into Excel, or images.

if I want I can see the quad mesh tessellation with the colors or only the colors.

Attachments:

• mesh.pdf, 347 KB

Permalink Reply by Hannes Löschke on March 7, 2012 at 2:50am

What's the content and data format of the excel file? There are several components that read excel.

You have the original 3d mesh and may have raw data for the mesh. Schould be easy enough to combine those in GH.

All that said, there even is a GH component with ssi that links GH with SAP2000.

Permalink Reply by Giulia Arcadi on March 7, 2012 at 3:20am

I show you what I got to get with Excel data.

Vectors you see indicate the directions of the curves but it is difficult to link them correctly and create continuous curves.

colors can help me the colors but I do not know how to combine the information.

Attachments:

• 120225_TesiG.gh, 32 KB
• ELICOIDE OK.3dm, 82 KB
• Cartel1.xlsx, 280 KB

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