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Suspended Ceiling using Grasshopper and Rhinoscript
AOP
4 Comments
I finally finished the script for the exhibition space we have designed where we suspend 3024 mason jar lids from a T-bar ceiling. In order to streamline the process, I used the Grasshopper plug-in to parametrically control several aspects of the design. Below, I try to explain each step of the process and how the script works. This script is much more detailed than the previous version, as now all of the steps are embedded into 2 scripts: one grasshopper definition which deals with all of the math behind the project, and one rhinoscript that deals with exporting the data to Microsoft Excel for easy access.
The files you will need to create the suspended ceiling are as follows:
New Update: I have modified the source files to be consistent with the release of the Grasshopper plugin on 10.10.2008. You can download all of the source files for the suspended ceiling here.
Step 1: The script needs a surface that is larger than the point grid area in order to function properly, so the first step is to generate a sufrace using any of Rhino's surface creation methods. This is the only step that is required prior to launching Grasshopper and running the definition. Click image for more detail.
Step 2: The first part of the definition creates a staggered point grid based on a variable offset distance (inches) which is parametrically driven by an integer slider labeled "point spacing". It is important that the point grid is created above the surface (z-axis). Click image for more detail.
Step 3: The next part of the definition duplicates the staggered point grid created in Step 2 and moves them along the z-axis so that the copies are below the given surface. Next, a vertical line is created between the original point grid and the duplicates. Click image for more detail.
Step 4: The definition uses a surface-curve intersection event to create a new point at the location where the vertical lines created in Step 3 intersect the surface. A new line is then created from the new intersection points and the original point grid created in Step 2. Click image for more detail.
Step 5: The script then uses a few components and functions to create a label that defines what panel the vertical line will be attached to, what lid will be attached to the vertical line, and the length of each line. A text tag is placed at the midpoint of each line similar to: "Panel1_Lid1 72.000". The distance is measured in inches and rounds the length of the line to the nearest one thousandth. All text tags must be baked into the scene in order to export the data to excel. (special thanks to Troy Zezula for collaborating on this part of the script). Click image for more detail.
Step 6: Once all of the text tags have been baked into the scene, use the "Load Script" command and locate the rhinoscript called "Export_curvedata_excel.rvb". The use the "Run Script" command and select the loaded rhinoscript from the menu. Follow the on screen directions in the command prompt and select all of the text tags. Excel will automatically open, and a new file will be created with the panel labels and lengths organized for easy access. Within Excel you can convert the length stored from Rhino (rounded to the nearest one thousandth) into a more managable dimension using feet and inches and a specified tolerance. Click image for more detail.
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Reader Comments (4)
if not secret - what render engine do you use to be able to render the points like that? thx.
No secret. It's a simple hidden line drawing exported from Rhino. First, I flatten the model to make a 2d drawing. I make sure that I check the box to "Maintain Source Layers" so that my "points" layer will be seperate from my "surface" layer... etc. Then it's just a matter of exporting the 2d linework to Adobe Illustrator and adjusting the line weights and transparency. I did render a very quick image (using the built in Rhino rendering engine) of the surface and used it as a backdrop for my linework. Other than that, it's pretty straightforward. I hope this helps.
..the work is very interesting. i'd like to know more about the connection with excel, but i didn't find the file "Export_curvedata_excel.rvb"...?
thanx!
Hi Marc,
I actually took the .rvb down because you can now stream data directly to a text file from a post-it panel within grasshopper. The .rvb is actually an extra step, and it was needed in the early stages of grasshopper, when the "stream to file" wasn't available. If you really need the .rvb file, I might be able to dig it up and email it to you.