algorithmic modeling for Rhino

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Added by David Stasiuk at 11:10am on July 9, 2015

Topic: Butterfly beta release for Grasshopper and Dynamo: ly has finally metamorphosed to have all known major bugs fixed and is ready to be used by a larger number of people in our community. Butterfly is powered by OpenFOAM, which is a validated and open-source engine for Computational Fluid Dynamics (CFD). Primarily, Butterfly assists with exporting geometry and other input parameters from the CAD + scripting interface to the OpenFOAM engine. The Grasshopper plugin supports live results visualization that updates as the CFD simulation iterates. The Dynamo plugin supports results visualization once the analysis is over or paused. For installation instructions and guidance on getting started, check out the Butterfly wiki page. There, you can find step-by-step installation directions and tutorial videos. There also 3 YouTube playlists for getting you started with installing OpenFOAM for Windows and using Butterfly for Grasshopper and Butterfly for Dynamo. Similar to other ladybug tools, Butterfly uses an external validated engine (in this case, OpenFOAM) and you need to install it first to get the insect up-and-running. However, unlike Radiance and EnergyPlus, OpenFOAM doesn’t have a native installation for Windows and it requires Linux to run. Accordingly, the current version of “OpenFOAM for Windows” uses a technology called docker to run a Linux virtual machine on your system, inside which OpenFOAM operates. While this sounds complicated, the good news is that all of this setup has been packaged into the installer for “OpenFOAM for Windows.” So running this installer with all its defaults should give you everything you need. The bad news is that the installation can fail if you don’t check your Windows system properly beforehand or don’t follow every step carefully afterwards. You will also need to run Rhino, Revit, and OpenFOAM as an administrator to ensure Butterfly works properly (by right-clicking each launcher for the program and selecting “Run As Administrator"). This said, if you follow the steps carefully, you should have no issues with the installation. You can find some of the issues that people faced during the alpha testing and the solutions to them here. Butterfly is the first plugin that is fully developed based on the structure that I discussed before which consists of a core library and [+] libraries for specific software (in this case Grasshopper and Dynamo). We hope this structure to extend ladybug tools to more platforms by re-using the current code. We will provide a better documentation with more details on this matter in the near future but for now you can use the API for butterfly, butterfly_grasshopper and butterfly_dynamo for customizing or extending the current development. Finally, having access to a powerful CFD engine from inside parametric/generative modeling environments is a great power and as Spider-Man or Uncle Ben once said: “with great power comes great responsibility!” We believe in learning by doing and we don’t expect you to be a CFD expert to get started with butterfly however we expect you to educate yourself along the way. If you have never used OpenFOAM before here is a great presentation to get started. We also highly recommend checking out the official OpenFOAM User Guide that goes through most of its functionality. Finally, we have also collected a number of other learning resources on this page that can be a good starting point. We understand that you will have questions about the plugins which you can post to this forum or Dynamo discussion forum however CFD related issues and questions should be posted to CFD Online. I like to thank everyone who have helped us with the development and testing during the last year or so, and special thank to Theodore who single-handedly educated me through the process of migrating to OpenFOAM and developing butterfly. Butterfly wasn’t possible without Theodore! As always let us know about your comments and suggestions. Happy flying the butterfly! Happy Spring! …; Added by Mostapha Sadeghipour Roudsari to Ladybug Tools at 11:06am on March 20, 2017

Comment on: Topic 'DataTree(of object) > GH_Structure(of ?)': 3. receiver gets data from sender via input (0) < the data here may be changed in the meantime, for instance if its a double then I would like to add 1 to it. 4. receiver sends data to sender's input(2) 5. go to 1. VS 2013 studio project folder SENDER Public Class loopStart Inherits GH_Component Dim cnt As Integer Friend Property counter() As Integer Get Return cnt End Get Set(value As Integer) cnt = value End Set End Property Dim iData As New GH_Structure(Of IGH_Goo) Friend Property startData() As GH_Structure(Of IGH_Goo) Get Return iData End Get Set(value As GH_Structure(Of IGH_Goo)) iData = value End Set End Property Public Sub New() MyBase.New("loopStart", "loopStart", "Start the loop with this one.", "Extra", "Extra") End Sub Public Overrides ReadOnly Property ComponentGuid() As System.Guid Get Return New Guid("bdf1b60d-6757-422b-9d2d-08257996a88c") End Get End Property Protected Overrides Sub RegisterInputParams(ByVal pManager As Grasshopper.Kernel.GH_Component.GH_InputParamManager) pManager.AddGenericParameter("Data", "dIn", "Data to loop", GH_ParamAccess.tree) pManager.AddIntegerParameter("Steps", "S", "Number of loops", GH_ParamAccess.item) pManager.AddGenericParameter("<X>", "<X>", "Please leave this one alone, don't input anything.", GH_ParamAccess.tree) pManager.Param(2).Optional = True End Sub Protected Overrides Sub RegisterOutputParams(ByVal pManager As Grasshopper.Kernel.GH_Component.GH_OutputParamManager) pManager.AddGenericParameter("Data", "dOut", "Data to loop", GH_ParamAccess.tree) End Sub Public Overrides Sub CreateAttributes() m_attributes = New loopStartAttributes(Me) End Sub Protected Overrides Sub SolveInstance(ByVal DA As Grasshopper.Kernel.IGH_DataAccess) Dim numLoop As Integer DA.GetData(1, numLoop) Dim loopDt As New Grasshopper.Kernel.Data.GH_Structure(Of IGH_Goo) If cnt = 0 Then Me.startData.Clear() DA.GetDataTree(0, Me.startData) loopDt = startData.Duplicate DA.SetDataTree(0, loopDt) End If If cnt < numLoop - 1 And cnt > 0 Then DA.GetDataTree(2, loopDt) DA.SetDataTree(0, loopDt) Me.ExpireSolution(True) Else DA.GetDataTree(2, loopDt) DA.SetDataTree(0, loopDt) End If cnt += 1 End Sub End Class RECEIVER Public Class loopEnd Inherits GH_Component Dim aData As New GH_Structure(Of IGH_Goo) Friend Property anyData() As GH_Structure(Of IGH_Goo) Get Return aData End Get Set(value As GH_Structure(Of IGH_Goo)) aData = value End Set End Property Public Sub New() MyBase.New("loopEnd", "loopEnd", "End the loop with this one.", "Extra", "Extra") End Sub Public Overrides ReadOnly Property ComponentGuid() As System.Guid Get Return New Guid("3ffa3b66-8160-4ab3-87c9-356b2c17aadd") End Get End Property Protected Overrides Sub RegisterInputParams(ByVal pManager As Grasshopper.Kernel.GH_Component.GH_InputParamManager) pManager.AddGenericParameter("Data", "dIn", "Data to loop", GH_ParamAccess.tree) End Sub Protected Overrides Sub RegisterOutputParams(ByVal pManager As Grasshopper.Kernel.GH_Component.GH_OutputParamManager) pManager.AddGenericParameter("Data", "dOut", "Data after the loop", GH_ParamAccess.tree) End Sub Protected Overrides Sub SolveInstance(ByVal DA As Grasshopper.Kernel.IGH_DataAccess) Me.aData.Clear() DA.GetDataTree(0, Me.aData) runner() DA.SetDataTree(0, Me.aData) End Sub Sub runner() Dim doc As GH_document = Grasshopper.Instances.ActiveCanvas.Document Dim docl As list(Of iGH_DocumentObject) = (doc.Objects) For i As Integer = 0 To docl.count - 1 Step 1 Dim comp As Object = docl(i) If comp.NickName = "loopStart" Then Dim compp As IGH_Param = comp.Params.input(2) compp.VolatileData.Clear() compp.AddVolatileDataTree(anyData) Exit For End If Next End Sub End Class …; Added by Mateusz Zwierzycki at 2:47pm on November 28, 2013

Comment on: Topic 'Thoughts on bouancy driven natural ventilation': looked at autodesk simulation cfd 2015 and was optimistic because it had an export plugin from revit, which i use anyway for material takeoffs and etc, but found that it did not take solar radiation into account. This was a downer because I have heard that solar radiation could effect indoor airflow - convection - as much as 50 percent at a time. Then I searched again and found that Hyperworks, a software by altair technology can be coupled with a radiation software. So I went through the trouble of obtaining an educational license of Hyperworks. However, though some email exchange I have found that the coupling is a one-way. The radiation analysis software was used, I think, for understanding the solar loading for a SOM project called church of light. The support guy said : "Unfortunately our coupling with Hyperworks is really a one way coupling. We can accept H coefficients from their software in RadTherm, but they will not read in our wall temps. That said, it still can be a useful coupling in the sense that you can run the analysis in Hyperworks, send H coefficients to RadTherm, and run the analysis to better understand radiation and conduction. Most importantly, that analysis can be done for longer transient analysis, but will require much less compute time and resources." Not only did I not understand what he means by the H coefficients, my wanting to get a CFD understanding coupled with solar radiation was again, unsatisfied. In the mean while I had to finish a presentation so I haven't had the time to try to get some result on the natural ventilation. I would probably need to look into how their solutions work before I can understand if their software would "do the job" Thank you for letting me know about your work on this. I downloaded the Honeybee_Set EP Natural Ventilation component and made sure that it is allowed, but it does not show up in grasshopper. You pointed out that "The component (and the corresponding equation) is mostly meant for cases where you have zones with windows that are NOT connected by an air wall (or a larger airflow network)." I wondered if you are suggesting it would be a code violation for zones to be connected by an air wall for fire safety reasons. It would be a violation I guess, like not putting an fiber insulation or some kind of smoke stop between Spandrel panels and the edge of a floor plate would be a code violation for a typical office building. There is a project by kevin daly architects where you can see a section drawing with what seems like a cfd analysis (could be an illustration) it was my initial visualization/simulation goals were for a facade design I am working on 1) an average air velocity across a zone at noon, for example, if a passive design strategy like this was used. for this I am guessing cfd is not entirely necessary. probably means that it could be used earlier in a design process, too. This would be more about user comfort. 2) at a later phase, like in detailing facade components, if airflow is indeed as expected for a zone that is connected to an air wall / chimney like feature (and to see if there is a proper mixing of air) 3) and a projection of energy savings, of course. After seeing a video of simulation cfd I was optimistic, but like I said sim cfd does not take account of solar loading. I think I would probably go ahead start with one zone with sim cfd first, try three zones stacked on top of each other, then try hyperworks and try to factor in solar radiation. For analyzing multiple zones on different levels, being able to add a chimney would be especially useful, I think. Having said that, I don't have a lot of experience of using honeybee except for the daylight component so it would take some time for me to understand the components. I hope some of the information here is useful for you. after all, both sim cfd and hyperworks are commercial softwares and somewhat different than the e plus project you are working on, I guess but still trying to address a similar problem. so.. in cased you missed it I was asking I downloaded the Honeybee_Set EP Natural Ventilation component and made sure that it is allowed and placed in the user object foler, but it does not show up in grasshopper. what could be the reason? …; Added by yj to Ladybug Tools at 9:32am on January 10, 2015

Comment on: Topic 'Voronoi relaxation (vorlax, voronax), kangaroo': o express my gratitude. I've been experimenting with your definitions (and still am), but let me extend my question. Actually what I'm trying to achieve, is to recreate another project by Andrew Kudless, the spore lamp (I mentioned the Chrysalis at the beginning just because of the animation, which wasn't included in the Spore Lamp presentation). Basically the spore lamp seems to me to be something like a preliminary study to the Chrysalis III project (I think it's a similar approach). Andrew stated on his site that he used kangaroo for this project, so the Spore Lamp consists in my opinion either of a relaxed voronoi 3d diagram (b-rep, b-rep intersection) on a sphere which then has been planarized, or more likely it is a sort of relaxed facet dome. The trick is to: 1. obtain a nicely-balanced voronoish diagram (or facet dome cells) 2. keep each cell/polyline planar (or force them with kangaroo to be planar) in order to move scale and loft them later on. Here is what I have by now. (files: matsys spore lamp attempt) That's the closest appearance that I got so far (simple move scale and loft of facet dome cells with the amount of transformations being proportional to the power of the initial cell area: bigger cell = bigger opening etc.) - with no relaxation of the diagram. But it's obviously not the same thing as the matsys design. Here are some of my attempts of facet dome relaxation, but well, it certainly still not the right approach, and most importantly I don't know how to keep or force the cells to be planar after the relaxation. 1. pulling vertices to a sphere - no anchor points. That obviously doesn't make sense at all, but the relaxation without anchor points gives at the beginning a pattern that is closer to what I am looking for. (files: relaxation 01) 2. pulling vertices to a sphere - two faces of the initial facet dome anchored (files: relaxation 02) 3. pulling vertices to the initial geometry (facet dome) no anchor points (files: relaxation 03) The cell pattern of the lamp kinda looks like this: you can find it here: http://www.grasshopper3d.com/forum/topics/kangaroo-0-095-released?g... Done with Plankton (of course without the "gradient increase" appearance), but in fact not, I took a look at Daniel Parker's Plankton example files, and it's not quite the same thing. Also the cells aren't planar... The last problem is that during the relaxation attempts that I did, the biggest initial cells became enormous, and it's not like that in the elegant project by Andrew Kudless, that I'd like to achieve. So to sum up: Goal no 1: Obtain an elegant voronoi /facet dome cell pattern on a sphere (or an ellipsoid surface, whatever). Goal no 2: Keep the cells planar in order to be able to loft them later and obtain those pyramidal forms, and assemble easily Any ideas? Or maybe there's a completely different approach to that?…; Added by Benoit Martel at 4:12pm on March 1, 2016

Comment on: Topic 'Help- Geodesic Dome- Beginner Grasshopper': les automatically at the right angle to form the cap of an icosahedron. To complete the full icosahedron, we consider just the six points we already know, the five pentagon vertices and the raised pyramid tip and reorient one of the vertices using three-point transformation so it obtains the exact same relationship between vertices only one more stage beyond our little cap pyramid, and we do a five-fold polar array: I used a password-protected cluster I ran into one the forum somewhere to reproduce Rhino's 3-point orient command: A final 3-point orientation transforms in space the original pyramid tip down to the bottom: Now we can create a convex hull which gives an icosahedron mesh: So that's how you build an icosahedron in Rhino from scratch, only using rather long winded Grasshopper. Now we use the Weaverbird plug-in to subdivide the faces and then project the vertices out onto a sphere via finding the closest points to a sphere and then recreating a convex hull to make a geodesic dome mesh: Subdividing two times works fine but 3 times blows up convex hull, so I'll just have due with the the subdivision step and leave out projecting back to a sphere, since the algorithm already gives a nice spherical result that you can see inside this disaster: Now you know what a standard geodescic dome is, just an icosahedron with faces divided into smaller triangles, projected out to a sphere. Actually, the mere subdivision is just a bit blobby instead of a sphere, damn it, so I'll have to topologically recreate the mesh after projecting the points indeed back onto our sphere. Using a subdivision plug-in may be slightly throwing the perfect result off, so manually creating subdivision points on each mesh face may be in order, doing them flat against each icosahedron face: You can also start with the two other triangulated Platonic solids but those give less regular triangles: …; Added by Nik Willmore at 3:57pm on March 19, 2016

Topic: Smart First-End Component Added: ree.. First-End List Component cannot manage branches inside every dimensions.. "Smart T8" Component is developed for managing the multi dimensional data tree with first-end algorithm. It works with path index location.. "-1" or negative numbers mean the location of item.. "0" means the location of the last path index.. positive numbers mean the location from the back.. ---- Now look at this example.. a simple 3-dimensional boxes.. In the data tree.. of {0;0;i;j} (k) "k" is the item index.. Y direction.. "j" is the last path.. X direction.. and "i" is the level.. Z direction.. ---- When index < 0 (i.e. "-1" or negative) "Smart T8" performs like the First-End Item Component.. It selects first items in each list and puts them out to "F".. and in this example.. they are boxes with same Y coordinate(=0).. In the below image.. F(Red) M(Transparent Green) E(Blue) are classified by Y coordinates.. ---- When index = 0 "Smart T8" focuses on the last path index.. It selects first list of every {0; 0; i; *} set of lists.. (i.e. every levels) In this example.. they are boxes with same X coordinate(=0).. because the last path means X grid.. In the below image.. F(Red) M(Transparent Green) E(Blue) are classified by X coordinates.. ---- When index = 1 "Smart T8" focuses on the third path index.. (i.e. 1 step from the back) It selects first list of every {0; 0; *; j} set of lists.. Actually in this case.. they are first levels of every YZ planes.. In this example.. they are boxes with same Z coordinate(=0).. because "Smart T8" manages levels now (index=1).. In the below image.. F(Red) M(Transparent Green) E(Blue) are classified by levels.. ---- When index > 1.. (if it is meaningless index or out of range..) It performs First-End List Component.. It selects only the first and end list of all lists.. ---- The "Smart T8" component works with 3 or more dimensional data tree well.. Please control the focusing index and enjoy it.. :) …; Added by Jissi Choi to Tree8 at 2:39am on November 5, 2012

Topic: Parse error when using example Python code for REST API “Authentication failed because the remote party has closed the transport stream”: a problem with SSL. Any Ideas? I am using the following code: import json,httplib connection = httplib.HTTPSConnection('api.parse.com', 443) connection.connect() connection.request('GET', '/1/classes/MY-CLASS', '', { "X-Parse-Application-Id": "MY-APP-ID", "X-Parse-REST-API-Key": "MY-REST-API-KEY" }) result = json.loads(connection.getresponse().read()) print result I Get the Following Messages: Runtime error (IOException): Authentication failed because the remote party has closed the transport stream. Traceback: line 280, in do_handshake, "C:\Program Files\Rhinoceros 5.0 (64-bit)\Plug-ins\IronPython\Lib\ssl.py" line 120, in __init__, "C:\Program Files\Rhinoceros 5.0 (64-bit)\Plug-ins\IronPython\Lib\ssl.py" line 336, in wrap_socket, "C:\Program Files\Rhinoceros 5.0 (64-bit)\Plug-ins\IronPython\Lib\ssl.py" line 1156, in connect, "C:\Program Files\Rhinoceros 5.0 (64-bit)\Plug-ins\IronPython\Lib\httplib.py" line 3, in script Any help would be greatly appreciated! Thanks in advance! -Zach…; Added by Zachary Soflin at 9:41am on September 21, 2015

Topic: Ladybug Solar Water Heating components released !: option, after downloading check if .ghuser files are blocked (right click -> "Properties" and select "Unblock"). Then paste them in File->Special Folders->User Object Folder. You can download the example files from here. They act in similar way, Ladybug Photovoltaics components do: we pick a surface, and get an answer to a question: "How much thermal energy, for a certain number of persons can my roof, building facade... generate if I would populate them with Solar Water Heating collectors"? This information can then be used to cover domestic hot water, space heating or space cooling loads: Components enable setting specific details of the system, or using simplified ones. They cover analysis of domestic hot water load, final performance of the SWH system, its embodied energy, energy value, consumption, emissions... And finding optimal system and storage size. By Dr. Chengchu Yan and Djordje Spasic, with invaluable support of Dr. Willian Beckman, Dr. Jason M. Keith, Jeff Maguire, Nicolas DiOrio, Niraj Palsule, Sargon George Ishaya and Craig Christensen. Hope you will enjoy using the components! References: 1) Calculation of delivered energy: Solar Engineering of Thermal Processes, John Wiley and Sons, J. Duffie, W. Beckman, 4th ed., 2013. Technical Manual for the SAM Solar Water Heating Model, NREL, N. DiOrio, C. Christensen, J. Burch, A. Dobos, 2014. A simplified method for optimal design of solar water heating systems based on life-cycle energy analysis, Renewable Energy journal, Yan, Wang, Ma, Shi, Vol 74, Feb 2015 2) Domestic hot water load: Modeling patterns of hot water use in households, Ernest Orlando Lawrence Berkeley National Laboratory; Lutz, Liu, McMahon, Dunham, Shown, McGrue; Nov 1996. ASHRAE 2003 Applications Handbook (SI), Chapter 49, Service water heating 3) Mains water temperature Residential alternative calculation method reference manual, California energy commission, June 2013. Development of an Energy Savings Benchmark for All Residential End-Uses, NREL, August 2004. Solar water heating project analysis chapter, Minister of Natural Resources Canada, 2004. 4) Pipe diameters and pump power: Planning & Installing Solar Thermal Systems, Earthscan, 2nd edition 5) Sun postion and POA irradiance, the same as for Ladybug Photovoltaics (Michalsky (1988), diffuse irradiance by Perez (1990), ground reflected irradiance by Liu, Jordan (1963)) 6) Optimal system and storage tank size: A simplified method for optimal design of solar water heating systems based on life-cycle energy analysis, Renewable Energy journal, Yan, Wang, Ma, Shi, Vol 74, Feb 2015.…; Added by djordje to Ladybug Tools at 8:05am on December 8, 2015

Comment on: Topic 'FLICKR API and Grasshopper': doing this with the current tools or a bit of scripting since the Flickr API allows you to make requests in a REST format, but utilizing the Flickr.net API library makes it much simpler. First and foremost, you need a Flickr API key...do you have one of those? A great way to get to know the Flickr API is with the API Explorer. Here is a link to the page for the flickr.photos.search method explorer: http://www.flickr.com/services/api/explore/flickr.photos.search The cool thing about this page is that it generates the REST Http call towards the bottom. So, here is what I did: 1. Grab the coordinates of the bounding box per Flickr API request: bbox (Optional) A comma-delimited list of 4 values defining the Bounding Box of the area that will be searched. The 4 values represent the bottom-left corner of the box and the top-right corner, minimum_longitude, minimum_latitude, maximum_longitude, maximum_latitude. Longitude has a range of -180 to 180 , latitude of -90 to 90. Defaults to -180, -90, 180, 90 if not specified. Unlike standard photo queries, geo (or bounding box) queries will only return 250 results per page. Geo queries require some sort of limiting agent in order to prevent the database from crying. This is basically like the check against "parameterless searches" for queries without a geo component. A tag, for instance, is considered a limiting agent as are user defined min_date_taken and min_date_upload parameters — If no limiting factor is passed we return only photos added in the last 12 hours (though we may extend the limit in the future). So, I went to Google Earth, picked a city (London, UK) and dropped two pins: This gave me two locations, which I can put into the Explorer Page next to the bbox option. Here is what I put for these two points: -0.155941,51.496768,-0.116783,51.511431 2. Check has_geo 3. In extras, type in geo 4. Make the call! You will see a list of responses in an XML format, these responses will be from the first page. Geolocated photos are limited to 250 / page, so you will have to grab them page by page. If you want to add more options (minimum upload date, maximum upload date, etc) you can do this as well) The best is at the bottom, you get the full http call for this: http://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=ffd44f601393a46e86aa3a5f8a013360&bbox=-0.155941%2C51.496768%2C-0.116783%2C51.511431&has_geo=&extras=geo&format=rest&api_sig=b42330e5d1523bd5fe60c2ad43acde99 Notice this call has some other api key, you should eventually replace this with your own. You could copy and paste this into a browser and you will get the results with the latitude and longitude: So this is really what you need to know to do this through GH. Since gHowl has an XML parser component that can access files on the web, you should be able to use the same http call into this component. Eventually, we get a response, and we need to grab the lat and lon data. With gHowl we can map these to xyz coordinates, and generate the heatmap...this is just a linear mapping: Attached are both the Rhino file and the Grasshopper file, as well as the image underlay. I am working on a series of components that makes this more straightforward, but for now, this should get you started. …; Added by Luis Fraguada to gHowl at 3:45am on March 1, 2013