algorithmic modeling for Rhino

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Comment on: Topic 'Difference between MRT calculation methods': Thermal Comfort Indices incoming long wave radiation uses Ångström clear sky conditions emissivity coefficient, with Maykut and Church cloudiness factor so that it accounts for cloudy sky conditions. So basically this corrections creates the cloudy (all) skies emissivity coefficient. I was not aware of the fact that .epw files have been shipped with the horizontalInfraredRadiation. Thank you for posting this information!I took a look at EnergyPlus horizontalInfraredRadiation page.In there they state that: "If it is missing, it is calculated".I am pretty much certain that in Serbia, government weather stations do not record the long-wave radiation data.So I thought that this data is probably recorded in more developed countries, definitively in USA.I replicated the formula provided by mentioned bigladdersoftware.com page in cases when "Horizontal Infrared Radiation Intensity is missing".This is the same Clark and Allen (1978) formula mentioned in upper attached Survey of Sky Effective Temperature Models.pdf, Table 3.Once I checked the differences between the Clark and Allen formula and the horizontalInfraredRadiation from the epw file, they were not actually really close, but the same.I checked for a couple of locations in USA, but also outside of it, for different climates. The results were again the same: I attached the file below.I must admit that there are also hours when -1/+1 difference Wh/m2 exists, but my guess is that this is due to rounding of the values which is performed by EnergyPlus as shown in the example at bigladdersoftware.com page (0.036, 0.815, 340.6). So it's either the Clark and Allen formula is super precise and can predict the long wave radiation to be exactly the same as the physically measured value, or .epw weather files are in fact not using physically measured values but calculated ones.My assumption would be that it is the second case. It seems that the only major difference between the two is that the Maykut and Church model seems to be overestimating the long wave radiation loss to the sky in very cold conditions. Otherwise the models show fairly good agreement Based on upper assumption, I do not think that we can distinguish whether either of these two incoming long-wave radiation methods is more precise or if the other one overestimates the La values.Thank you too for the knowledge and the shared information!!…; Added by djordje to Ladybug Tools at 10:28am on June 8, 2016

Comment on: Topic '3 Dimensional Cracking': On the other hand ... well ... we can pretend that this could be some sort of add-on dedicated for broken pieces, (and nerves if loops = a big number) he he. Anyway: 1. If you enable the history (the yellow things) you can watch the recursion working: get a donor box and "slice" it in 2 (either via an "orthogonal" plane [the fast boxes] or a random one [the slow breps]). Then get each one and repeat until the desired "depth" of "slices" is achieved (the loops, that is). Pure recursion in terms of programming (a function does something, yields results and then calls itself to further process each result). Double click on the C# to see the code (but don't change anything). For the record this is the function that does the main job (spot the fact that if it's not terminated it calls itself [last line]): 2. The x, xy, xyz options restrict the random plane (actually in the boxes case there's another technique used (Intervals) but never mind). For instance (case random breps) the slicing plane is defined at the brep center and using a random direction: Vector3d dir = new Vector3d(rand.NextDouble(-1,1), rand.NextDouble(-1,1), rand.NextDouble(-1,1)); If the 3rd value is 0 then the plane's YAxis is parallel to Plane.WorldXY.ZAxis. 3. Now if the "slicing" thing was a random polyline at a random plane the pieces could be far more "elaborated" (and/or "naturally looking") ... but the thing with programming is to know(?) where/when to stop. 4. This approach could use any donor Brep (a blob for instance) or a Brep List. Notify if you want to add such an option. 5. Added some lines more for an option that allows to sample the pieces (due to the last loop) in an automated flat "layout" (it's a bit more complex than it appears on first sight). 6. The x,y restriction mode now affects the random slices as well. See what I mean: and the same restriction using boxes: Truth is that all that freaky stuff could be helpful for you if you had serious plans to learn C# (not something achievable without pain and tears aplenty). best…; Added by peter fotiadis at 11:05am on February 16, 2017

Topic: Sorting points: e point in each pair that has the lowest Z value (then later the highest Z)... The problem is the intersections are not returned sorted by Z, sometimes the lower point is first in the list, sometimes last. So I need to sort those pairs of points by Z value.I noticed the sort points component does not have any inputs for sort criteria... RhinoScript SortPoints allows you to sort by: blnOrder Optional. Number. The component sort order, where: Value Component Sort Order 0 (default) X, Y, Z 1 X, Z, Y 2 Y, X, Z 3 Y, Z, X 4 Z, X, Y 5 Z, Y, X Will we get something like this in GH? For now I think I can manage to analyze the Z for each and re-order the points, but a more comprehensive point sorting tool might be nice... no? Or did I miss something obvious? --Thx, --Mitch…; Added by Mitch Heynick at 4:17am on March 6, 2010

Topic: Batch View Capture: works joyfully if you want to change parameters and generate screen captures and planning to do a lot of them. You can of course generate the file name dynamically referring to the parameters you gave to the script, so that you have meaningful file names. The example below will generate two captures at J:\Temp\001_top,jpg and J:\Temp\001_front,jpg both at 600X600 px in ghosted mode. The instructions are as follows: (if you open the VB code by double clicking you will see it) ' Note1: The script is actually calling Rhino commands. ' Note2: Remember you have to draw something and is selectable for the script to function. The script uses _SelAll then _Zoom _Selected ' Note3: After you toggle blnSave to True, a new viewport will popup, be patient while Rhino work, and wait for that viewport to disappear befor clicking on anything. ' Note4: The component is not stable if you try to mouse click on anywhere while the saving process is running. Some stupid move may crash your programme, save RH and GH files before using this component. ' FileName : String Input = Supply with the path and file name without ".jpg" extension : e.g.: "C:\Temp\001" (Without the quotes) ' blnSave : Boolean Input = Saves when toggles to True (Remember to toggle back to False after use, otherwise the script will re-run itself during next update) ' Resolution_width : Integer Input = Resolution for the captured image ' Resolution_height : Integer Input = well... ' TopYea : Boolean Input = Toggles if the Top View is captured (Default is False if not connected) ' FrontYea : Boolean Input = Toggles if the Front View is captured (Default is False if not connected) ' ...Yea : Boolean Input = Toggles if the corresponding View is captured (Default is False if not connected) ' DisplayMode : Integer Input(0-4) = Sets the display Mode 0:Shaded 1:Wireframe 2:Rendered 3:Ghosted 4:XRay Default:Shaded I remember I took some code from somewhere but I forgot exactly the source, (if someone could remind me I would love to cite) I rewrite most of them though. But the attribution header in the code still remains there and now it seems a bit interesting to see the family tree: '////// Marc Hoppermann ///////////tweaked by Damien Almor ///////rewritten for curves by to]///////adapted by u]...www.utos.blogspot.com ///readapted by Victor Leung @ www.dreamationworks.com Visit my blog if you have time: www.dreamationworks.com…; Added by Victor Leung at 2:54am on June 5, 2011

Topic: facade problem: se (like in nature). the length of the sticks shall be controlled by the brightnessvalues of a picture. so the bend have to be controlled, too. now we have several problems: 1. how can i map a hexgrid on a curved surface? 2. how can i adapt the grid to the dimensions of the surface (no overlap, no gaps to the bound)? 3. important : to create the curved sticks, we use points on a line and we move some of them and then we want to connect the right points via interpolated curve to create each curved stick. now the problem is that the points have to been filtered in the right way. we know that we have to filter each list of points to the index values of the points. the number of index values is the number of hexgrid rows, so there are a lot and we can't use a list item for each one. it could be hundreds. is there any opportunity to sort a list after the index values (first every index=0, then index=1, ...n)? or is there any component which does a group of operations for n-times (n is the flexible number of index values) ? 4. how can i control the length and bend of the sticks via the brightnessvalues of a picture? please help us. thanks. 　 german version: In einem hexagonalen Raster soll sich senkrecht zu Oberfläche ein Stab im Mittelpunkt jedes Sechsecks befinden. Dieser soll sich ab einem gewissen (festgelegten) Punkt Richtung Boden biegen. Zusätzlich wird die Länge des Stabes zum Beispiel durch die Information eines Bildes gesteuert, so dass auch die Biegung, je nach Länge, geregelt werden muss. Wir haben ein Hexagonales Grid (HexGrid) erzeugt und in jeden Mittelpunkt eine Linie senkrecht zum Grid erzeugt, aus der wir uns Punkte mit CurvePoint ausgeben lassen. Der letzte ist verschoben, um eine Biegung zu simulieren. Um die Punkte zu einer interpolierten Kurve zu verbinden, müssen sie nach dem Index sortiert werden. Gibt es eine andere Möglichkeit, als jeden einzelnen Indexwert über ein ListItem herauszufiltern (Da die Rasterung flexibel einstellbar sein soll, entstehen n Indexwerte)? Oder kann man eine Liste nach den Indexwerten, also nicht nach den Punkten, sortieren? Und wie kann man über Bildhelligkeitswerte die Länge der Stäbe und damit auch die Biegung steuern (ein kurzer Stab biegt sich weniger als ein langer Stab)? Gibt es die Möglichkeit ein hexagonales Raster auf eine gekrümmte Fläche zu mappen? Und wie passt man ein solches Raster (HexGrid) in eine Fläche mit definierten Maßen ein, ohne dass das Raster an den Rändern übersteht oder die Fläche nicht vollkommen ausfüllt? danke.…; Added by doro hamann at 7:34am on December 20, 2011

Topic: parametric architecture competition script needed (the swarm and the hive mind): n due at the end of march. i am hoping to see if i can do this as a sort of "HIVE MIND" experiment with one or two or more posters to the forum. i have uploaded two files to http://www.formpig.com/nine_bar-FAR and I have the following goals: 1. To "kinematically iterate" various formal building envelopes based upon a 50' x 100' lot that "conform" to the nine bar linkage geometry. 2. This lot would have "setbacks" consisting of two 5' side setbacks, a 10' rear yard setback and a 25' front yard setback. max height on the structure is 32' and the allowable overhangs into the setbacks are 2'. I would like to find a way to use the "nine bar geometry" to construct a series of iterations for "floors", "walls" and "ceilings", which would then be tied to a volumetric (cubic volume), or a total square footage (perhaps based upon two horizontal section cuts) which was based upon a given number that I will provide per local building code. 3. Laid on top of this we would also have "mcmansion ordinance" requirements based upon the pdf enclosed. i expect to have this "tent restriction" data in digital form to upload to ftp shortly. It would be up to you individually or collectively to determine how best to position this "in the real world" based upon the lot, setbacks, zoning requirements etc. For instance, perhaps the nine bar configuration has its vertices coplanar with the 50' x 100' x 32' envelope restrictions and then the chosen volume is "trimmed' by the setback requirements. Or perhaps the nine-bar configuration is generated completely within the setbacks, or perhaps it is generated 2' outside of the setbacks so as to take advantage of the 2' overhang allowance on the setbacks, etc. * Given an opportunity to develop the work in a second phase we would have an opportunity to tie this into various efficiencies such as Bill of Materials (wall floor and ceiling square foot calculations), envelope to volume calculations, solar panel efficiencies (solar orientation and envelope geometry) etc, etc (love to get suggestions for this). * I've become /really/ convinced that this would be a /really/ interesting entry based upon my just finishing up Kas Oosterhuis' Towards a New Kind of Building: A Designer's Guide for Non-Standard Architecture". In an ideal world I was hoping that it would be possible to hash this out discussion-wise and then literally passing it around on the list after someone eventually made the first move by tossing out a rough ghx script. My expectation would be to finalize it rapidly in the next two weeks. Something of a contemporary version of a design charette. However, I realize this may not be workable so if you have experience in this arena and particularly if you think this is a brief that is straighforward enough to be almost literally implemented in Grasshopper, please contact me for any wage and/or contract fee requirements. I'm getting a bit of a late jump on this but my hope is that with the right participant(s) that I can thrash it together quick enough for the first round. info@formpig.com…; Added by Jonathan Chertok at 2:18pm on March 5, 2012

Topic: DigitalMed workshop: mapping, parametric design, digital fabrication.: ly 26-27-28-29 (digital fabrication) The third edition of digitalMed Workshop is structured as a design laboratory. Participants will learn the challenging process of producing ideas, projects and research analysis that are to be developed through specific software and concepts that emerge through the use of mapping, parametric design and digital fabrication. The workshop will take place in the city of Salerno (Italy) and it will last 11 days structured into 3 intensive weekends: July 13-14-15 (mapping); July 19-20-21-22 (parametric design); July 26-27-28-29 (digital fabrication). Goals and Objectives: We aim to make clear the theoretical and technical knowledge in the approach to parametric and generative design and digital fabrication. (From collection and data management, to the manner in which these inform the geometries, to the fabrication of prototypes.) Participants will also have the opportunity to practice the new knowledge gained in the design laboratory through project work. Project Theme: "Urban Field" Identify, study and analyze the system of public spaces in the urban area of the city of Salerno. Connection, mutation, generation and evolution are the themes to be followed in project work. Brief Description of Topics: - Mapping. Our reality, in all its forms, has studied through concepts of the theory of Complex Systems. The techniques that will be used to study events and places of reality, will work for the management, manipulation and visualization of data and information. These will form the basis for project management and driven geometry, conducted during the second phase of the workshop. - Parametric Design. Introduction to Rhino* and Grasshopper. Specifically, we will explain the concepts with which to work with the software of parametric design and how they function. Through these tools, we will arrive at the definition of systems of mathematical and / or geometrical relationships that are able to generate and govern patterns, shapes and objects that will inform the final design. - Digital Fabrication. In this phase, participants of the workshop are organized into working groups. Participants have access to materials and conceptual apparatus that will take them directly to the fabrication of the geometries of the project, with the use of software CAD / CAM interface and the use of machines for the digital fabrication. The DigitalMed workshop is organized by Nomad AREA (Academy of Research & Training in topics of Contemporary Architecture), in collaboration with the City of Salerno, the Order of Architects Province of Salerno and the National Institute of Architecture In / Arch - Campania. Interested parties may download the Notice of Competition at the address www.digitalmedworkshop.com and fill the pre-registration no later than July 10th 2012. PRESS OFFICE Dr. Francesca Luciano 328 61 20 830 fra_luciano@libero.it For information or subscriptions: e-mail: info@digitalmedworkshop.com - tel: 089 463126 - 3391542980 …; Added by Francesca Luciano at 4:09am on June 11, 2012

Topic: Grasshopper render animation with VrayToon: nition. Using RenderAnimation component from http://www.giuliopiacentino.com/grasshopper-tools/, I could do all of above except for the Toon material part. I have found a post regarding same matter ( http://www.grasshopper3d.com/forum/topics/how-to-add-materials-to-material-table ), but since I am not very familiar with scripts, this is what I think his definition does. Correct me if I am wrong. Since Rhino Vray only supports Toon environment per material (unlike Max Vray has global override feature), 1. import toon material from Rhino material editor 2. add colors to the toon material and make new toon materials with color (as many as needed) 3. import that new materials back into grasshopper 4. match them with designated geometries and render. (RenderAnimation component by Giulio does this job) Here is the final work he did : http://vimeo.com/34728433 Grasshopper + Vray from Marc Syp on Vimeo. I am using rhino 4 with vray 1.5. I have uploaded my definition, simple definition that transforms box height along with color as frame advances. The definition works but toon effect is not there.…; Added by Andrew Jinho Ahn at 12:35pm on January 21, 2013

Topic: Kangaroo matters (relaxing "shapes" to nurbs): case for sure (started by Giorgio a couple of days before). Ive got involved because I exploit ways to "relax" shapes on nurbs (say patterns created by Lunchbox or "manually) without using any kind of mesh (more explanations soon). Here's 5 test cases (SDK appears that doesn't have some "thicken surface" thing ... thus the algo that finds the "whole" shapes is rather naive) VS 2 Kangaroo "methods" and the why bother (he he) option as well. If the goal is to "fit" these shapes within the nurbs ... does it work so far? No I'm afraid (appears that "springs" used are not the proper ones - or [Kangaroo1 option] the lines that pull should been originated from valance 2 points only) Tricky points: 1. Internalize appears having a variety of serious issues (see Input inside definition) - Load Rhino file first (but even so ...). 2. Pull to surface is deactivated - this is not the issue here (and it's very slow). 3. Since Starling/WB alter the "curves - points" related order the issue here (Pull points to curves) is to correspond apples to apples: and that's what Anemone does: From chaos : to order: this means that prior activating Kangaroo you should double click to the Anemone start component in order to "sort" properly the curves. But .. fact is that results are pathetic: more soon best, Peter…; Added by peter fotiadis at 12:03pm on July 31, 2014

Topic: Exo W (Ctrl+Alt+Defeat , he he): Accidentally that was very close to some project that I have in mind (using solely C# and not components). On first sight I thought that that could be very easy ... only to discover that's not. This definition is an over simplified version of the other mentioned (only a C# is maintained that does "preparation" work and some sort of naive "topology" checks: the yellow spheres are used as visual aids to the incompatible struts/R values combos). You can control the 3 options available from that portion: In a nutshell ... the Exo W behaves with an odd way (at least in my opinion). In order to get the gist of the issue stick to that portion of the def and forget the rest: This portion of the def attempts to create an usual Exo mesh using a Line list (cleaned and user controlled as regard the min length) derived from exploded mini voronoi (i.e. brep edges). OK, I can understand the red Exo since due to the nature of voronoi breps there's more than possible the presence of small "struts" that may yield non manifold topologies. But ... the thing is that Exo W is also red in the other mode (non Voronoi) where struts are quite big and no potential "engulfed" situations may occur: And when the 2d Gate mode is set to Envelope ... there's cases (R values) where Exo W works as expected and cases that it doesn't. Anyway ... if anyone has any bright idea, drop a world best, Peter …; Added by peter fotiadis at 12:05pm on February 25, 2015