le with you.
I am trying to achieve the minimal path algorithm of Steiners tree in Python using the minimal path algorithm.The syntax would be as followsFirst I need to create a cube of any dimension.
Then I need to specify one origin say point A and destination point say B.
Now for this point A,B I need to create a machine based network which will automatically enroute A to B.
Where the angle will be constant i.e 120, length can be a variable, triangular node(steiners tree)using these constraints it will create a network.
Now, I should iterate the program in such a way that I should specify the further points say like A1 and B1 so on.The program will contain a limit constraint where it will come out of iteration loop and start a new loop,forming the network.
By this I will get a dense network of 120 deg branches.
The branching gets denser the moment I add source and destination points.
There can be 100 iterations to reach from A to B but the algorithm chooses the one following the minimal path.
I would be highly thankful to you if you would please share the python syntax and grasshopper definitionCapture.JPG for the same
Thank you for your time in advance
I would be highly grateful if you help me through
warm regards
Arya
12.gifShortest%20path%20algorithm.gh
min-paths.jpgcc.henn.studyimagesminimalpaths.jpg …
Grasshopper. So, I once made an attempt to bind ms sqlServer in order to get frozen definitions at some states, to avoid managing baked objects in Rhino and also be able to retain whole results without using the GH state manager that rebuilds everything.
But at that time GH's VB.Net component didn't properly read referenced dlls and I forgot it since then.
At first, I was surprised by Slingshot's extensive interface : I was still having in mind my own old project, a tool that would have acted at the Rhino's geometry object level, and auto creating the needed tables.
The bd would have consisted of a main table, owning the objects ID and name, and related tables containing the necessary information relative to the main objects.
For example, a Brep is made of so and so underlying objects, passed to respective tables, according to GH objects definition layout (just the way they are written in the xml schema).
Then, on a db, query an object by name, and retrieve the whole object or underlying objects (e.g. at the bounding curves level, or points level for a Brep).
With Slingshot, I made a few attempts to cheat GH with BLOB data fields, but no way to get a whole object. It seems that GH simply provides an object.toString ... and GH is definitely not conceived to produce persistence outside of Rhino. If I have some spare time, I will try to extract
About points and colors, I am now simply using a single field with CHAR(asLargeAsNeeded...), as GH parses String to every Point (or Vector or Color) entry of any component.
I do so because it need less to display on the canvas...
Whatever I wrote before, I really like your conception, as opened to relational interactions between ...whatever you need or dream of !
One last thing : GH can't open the definition file "Genome_DB_Template.gh" that I've downloaded from your site : http://slingshot-dev.wikidot.com/database-genome. I was expecting to learn a lot from your very smart stuff ! (I am running GH 08.00.13 and Slingshot 0.7.2.0)
Slingshot is running great, opened to any use...Thanks again.
Best,
Stan
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Refinement component at first, possibly using MeshMachine instead which is slow but actually gives many fewer triangles and adaptive meshing for tight curves too. Neither are easy to adjust on a deadline!
Then you have to sneak up on workable settings, using only a few lines, or Grasshopper will freeze perhaps indefinitely for 200 lines with extreme settings, especially the CS (Cube Size) setting that can blow up into a huge number if your scale is big.
Cocoon gives lots of nearly flat split quad faces so I quadrangulated those for fun:
Or MeshMachine can refine the mesh to make it efficient:
Whereas the Cocoon Refine component will merely return an equally fine mesh with more equilateral triangles but no serious remeshing to rid so many tiny triangles where they are not needed? Actually, it does seem to remesh also:
David said he used some of Daniel's MeshMachine code in there.…
rld.wolfram.com/EnnepersMinimalSurface.html
when i type the equations for z,y,z it says a syntax error so i obviously do not understand how to construct an expression. (screen capture attached)
Any help/explanation of using this function would be greatly appreciated
thanks so much
Capture.JPG…
on 2: I think the reason to draw a fitness landscape is to highlight graphically the presence of local minima, even in a simple optimisation problem. In architectural terms, this means getting an idea of how many sub-optimal solutions there are in a problem, which helps while exploring conceptual design proposals.
Have a look at this very basic example (which I published with two colleagues on "Shell Structures for Architecture", chapter 18): a shell footbridge (24m x 4m footprint), which is generated by two parabolic section curves (the two apex heights are the two design variables). The maximum displacement of the structure under gravity load and self-weight is the objective function. Simple example, but several local minima and interesting shell forms (image below).
@AB,
The expression used by David in the Number of Samples Input is a simple “x+1”. By grafting the Divide Curve Output, he got 81*81 lenghts (6,561 values). You have to make sure that number is divisible by the no. of samples. The second expression used for the Length output is only a scaling factor (my guess), to control the height of the fitness landscape drawing.
Cheers…
n account of the position of the sun and weather cannot be expressed in terms of a single set of luminous intensity values (which is what IES files do).
With regards to your example files, I agree with Chris. The primary reason for the low illuminance levels is that the light bounces are getting lost in the tube. Have you checked with the manufacturer/distributor if the location of the IES file should be inside the tube and not flush with the ceiling? Physically modelling such tubes in lighting software like Radiance (which is what HB uses) or AGI32 is a fairly expensive proposition. This is one of the reasons why manufacturers provide photometric data for such devices (however simplistic that data might be).
The candelamultiplier increases or decreases the luminous intensity values. So it will have a direct impact on the calculation. The primary reason for having that input was to enable users to do some testing with different lamp types and environmental factors such as dirt depreciation. You need not change them for your simulation. Assuming that the IES file is inside the tube, in order to make this calculation work inside HB you'd have to crank up the calculation settings to a very high level (start with -ab 10 -ad 4096).
Finally, due to shortcomings in the annual simulation software (Daysim), IES files will not work directly work with annual calculations. However, there is a fairly easy workaround for that issue. In case you are planning to run annual calculations with IES files, please let us know here.
Sarith…
ing illuminance and limiting exposure (lux hours). Hours with direct solar irradiance are likely to exceed the limiting illuminance thresholds, which range from (200 to 50 lux as per Table 3.4 in CIE 157:2004). It makes sense to consider direct illuminance (an ab=0 simulation in Honeybee) separately from a normal illuminance calculation.
Assuming that the museum exhibits have low to high responsivity to light, an ideal solution would minimize direct sunlight. For daylight from the sky and reflected light, it might be enough to keep the illuminance levels below the recommended thresholds and then sum up lux-hours.
Daysim, the annual daylighting engine used by Honeybee and DIVA, is not very accurate for direct-sun calculations. You will get more accurate results if you run your analysis with Radiance directly.
Instead of considering the horizontal illuminance grids, one can create grids that correspond to the dimensions of the exhibit and then average those values. I think single points, as shown in your gh file might not suffice. Calculating lux-hours is by far the simplest part of such a simulation. It will only require averaging these points, extracting them into an array and then summing up that array.…
a pain to use sometimes. I recently found this great post:
http://www.grasshopper3d.com/forum/topics/formatting-numbers-in-grasshopper
which points to the msdn .net framework standard numeric format strings:
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
and the custom ones too:
http://msdn.microsoft.com/en-us/library/0c899ak8.aspx
Sooo... today I was trying to make a 2D array generator for RGB values to use with a RGB LED and an Arduino. For instance, declaring a 2D array in Arduino:
int color[3][3]={{255,0,0},{0,255,0},{0,0,255}};
I'm using the blend color component to spit out transitions between two colors. I want the list in the panel to be in the format above, so I used both the expression component and the string format component (are they the same under the hood?). In any case, if I have R, G and B values coming into the component, I want to format them so the come out looking like {R,G,B}, so I can just copy the output in a panel and paste it into the Arduino IDE. But what about {curly braces}. If the expression/format component uses them in it's syntax, for instance:
Format ("{R:0},{G:0},{B:0}",R,G,B)
how do I get them into the formatting string? I tried escaping them like:
Format ("\{{R:0},{G:0},{B:0}\}",R,G,B)
but that just makes the component angry
Escaping characters is explained in the formatting references above. Is it implemented in this component? Should I be looking at a different approach?
I've included a sample file below.
Thanks!
~BB~
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ing-in-python?commentId=2985220%3AComment%3A628495
For the most part, I got the serial port to work and I could share the port with other components without wiring the components together using a sticky Python dictionary. There were a couple of issues with closing the port (Rhino had to be restarted).
In any case, I'm back at it. I am however going the C# component route with an eye towards writing my own components with visual studio. I am trying to create bidirectional communication with a serial device in grasshopper. I need more control over the serial port that the generic Firefly components can afford. Furthermore, I would like to understand how to program this myself. The first goal would be to create a few components that could handle various serial tasks, one to open/close port, one to read from port and one to write to it. This is not unlike how I got it to work in python, and is also similar to the logic in Firefly's serial components.
The thing that has me stumped with C# is how one shares the port between components? If one component is responsible for creating and opening/closing the port, how do the read/write components address the instance of the port created in the other component? Python has the sticky dictionary, is there something similar in C#? I'm a novice when it comes to C# and how it works within grasshopper, so maybe I'm missing something simple.
I've attached a klunky definition that uses C# to open/close a serial port. I've tried accessing the port with other components, but I don't know enough to make it work. Again, I'm mainly interested in the mechanics of how one component can access the serial port instance created in another component. If I could get some user objects going for now, I'd be happy. In the future, I want to roll my own components. If anyone has any suggestions, code snippets, or any other forms of enlightenment, I'd be greatly appreciative!
Rhino5 x64 + GH version 0.9.0056
Thanks,
~BB~
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try to get the output. In this case the output needs to be set before requesting for it. I am doing it with this call:
ret = gsaobj.Output_Init_Arr(1,"Global","A1",14003001,3)
In API help the call is documented like this:
short Output_Init_Arr (long iFlags, string sAxis, string sCase, enum ResHeader header, long num1dpos)
so this call has 5 arguments (long, string, string, long, long) (the enums are defined as longs)
This call works, because when I print the ret, i get 0 that is "succeded" so everything works so far.
Then I request the output with the following:
results = []
ret = gsaobj.Output_Extract_Arr(10,results,numcomponents)
In API help the call is documented like this:
short Output_Extract_Arr(long iRef, SAFEARRAY(struct GsaResults)*arrayResults, long* numComponents)
I am getting the error "
Runtime error (ArgumentException): Could not convert argument 1 for call to Output_Extract_Arr."
So it seems that is not accepting 10 as a long in the beginning (assuming that argument 1 is the first). I already tried passing a variable as long, using long(10) there, nothing works.
Furthermore I don't know if the other two variables are correct like that. I come from VBA where I need to declare everything but AFAIK python is more permissive in this sense. "results" should be a dynamic array of objects and "numcomponents" a long.
Any help would be appreciated!
Thanks! :)
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