Triangle Pattern Cutout in Surface by Image Sampling

Hi i am very new to Grasshopper so forgive my poor knowledge

this work is for my graduation project and i am in hurry so please help!

what i am trying to do is making a triangular pattern that is cutout in a surface and the cutout size is controlled by an image sampling that's it

what i did so far is using the Triangle panels component by lunchbox to draw my pattern and after that i am stuck i watched so many tutorials and tried but something always go wrong,

the result i am looking forward to achieve is exactly like the attached image.

thanks in advance

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Permalink Reply by Laurent DELRIEU on June 19, 2015 at 8:02am

Hello

here is an example of what you can do. It seems strange that you didn't find examples !

Get center of your triangle with area component (not trivial isn't it ! )
Project these points on your surface and get UV (coordinate in 2d on your surface)
As these UV have not the same domain as your image (image domains are by default [0 1] you need to remap theses UV coordinate
Theses remapped coordinates are put on image sampler
Put for example brightness as output of "image sampler" and use that as factor to scale your triangles
Triangles are scaled with an origin which is its center. Scale is red because some Factor is zero. You can put a function between "image sampler" and "scale" for example x/(max-min)+min in order to have no scale factor more big than max and no scale less than min. Up to you to choose.