Hi all, How can i draw a polyline or a spline based on a raster image like the one attached? Because i have several images and i’m trying to find a way to make this tracing automated. Thank you. EDIT: all the images i’ve to treat have this color red lines and the background transparent. [prova] …

Thank you for your reply. I haven’t tried anything yet, because i usually draw my outlines in AutoCAD and then i import them in Revit. I asked on purpose because I’m not practical to dynamo and maybe there is a simple command to do my task. If my request is not clear, please let me know and i’ll …

I remembered doing something similar but had to do it with python, outside of dynamo (which uses ironpython): Look at this https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_contours/py_table_of_contents_contours/py_table_of_contents_contours.html#table-of-content-c…

Thank you @GregX I was looking for something similar, like the function ConvexHull of OpenCV. It’s ok if i have to do something in Python because the images i’ve to analize come from an automated custom object detection model written in pyhton. Maybe to make it more flexible for Dynamo i was thinki…

I can’t remember well but when I ran my python script with opencv it exported a txt file with a list of polylines with its points coordinates, so you should just be able to read that in dynamo and do what you have to do!

It sounds more practical doing something like this! Thank you again, i’ll try to modify my code on python!

If you manage to make It work could you post your solution in order to help other members of the forum that may stumble upon this post? Thanks!

For sure i’ll post the Dynamo’s implementation if i ever find a solution :smile:

@Francesco_Cavazzini Managed this on a small part of your image. [img0] imgTrace.dyn (36.1 KB) [imgTrace] Note: To group contiguous points a variation of the Group Curves definition is used

Thank you very much!!! I’m trying it right now! How long did it take to complete the process?

Drawing shapes from raster to vectorial

Revit

Tom_Kunsman October 4, 2018, 10:55am 2

please see this FAQ - posting some things that you have tried, or searched for and did not work would help: How to get help on the Dynamo forums

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Drawing shapes from raster to vectorial

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