Grasshopper

algorithmic modeling for Rhino

hello, 

i think i have a fairly simple question.  i have imported a set of 9 points from a spreadsheet and i'd like to make a surface from those points.  i have set my u value to number of points + 1  (10) because i believe from reading elsewhere that is what i should do.  i receive the error message that the u count is not valid for this operation.

any suggestions?

files attached. 

thank you,

prentiss

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the u value should correspond to the number of points per row (3), not the total number of points (9). in this case, with your total of 9 points arranged 3x3 set the U input to "3" and it will work.

thank you, gustav!

i've made some progress and i have a surface but it is a flat plane and does not show variation in the z direction.  any ideas on what is going on and how to fix it?  files attached. 

thank you

oops, files attached now.

i think the problem has to do with the way the information is arranged in the spreadsheet. i could make 5 separate lines of 7 points and then loft the 5 lines, as an alternative to what i've done here. 

do you have suggestions as how to create a line from the first 7 points (that run along the x axis from left to right)?  i'm having trouble with that in grasshopper. 

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ok, i've solved my problem.  just needed to put a line component on the end of the xyz component and then loft the separate lines together.  

no need of a line component. 

You have to cull the first line of your coordinate list. That's causing an issue in the point component. Then set the U count to 5 and toggle Interpolate in the surface component. 

file attached, need to update the path for your spreadsheet

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wonderful, that was really helpful.  thank you, martin.

hmm, it worked when i opened your file, and now i can't get it to work again.  

i think when you said "need to update the path for your spreadsheet" you just mean i need to right click on the path component and set one file to the spreadsheet, yes?

what could be happening?

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you might have opened the spreadsheet in excel

these are the latest files.  

if i understand correctly, the problem is having the excel file open and then grasshopper won't work.  this is what you were referring to, yes?

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You need to have a proper grid, so in your case 35 points. Don't cull the first point.

Leave away the cull component and set U Count to 5

i can see the surface now, but it appears as a flat plane whereas it had a change in z value when i had it working the first time i tried your definition (the one with the cull).

i'm so puzzled why the cull worked the first time but now now....

thank you, i do appreciate your help.

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