well, very similar input data must result in wildly different hashes. For example, imagine we have an algorithm which computes hashes of text, and the hashes it computes are all numbers between 0 and 999. We then apply this algorithm to a piece of text:
"When Spring comes back with rustling shade" = 385
So far so good. Now imagine we change the text slightly, for example by removing a single "l":
"When Spring comes back with rusting shade" = 973
Minor change -> very different hash. There are of course way more unique texts than there are numbers between 0 and 999. This must therefore mean that a lot of text will result in the same hash. For example "When Spring brings back blue days and fair." may also result in a hash of 385. Because of the pigeonhole principle, there is nothing to be done about this.
Now for the tricky bit. Hashes are often used to validate executable code. Say your friend James at MI6 sends you a small program that will allow you to eavesdrop on Angela Merkel, and -over the phone- he tells you the hashcode for that application. You can then hash the application yourself, verify that it indeed results in the same hashcode and then you know you can trust the executable.
But now Jack from the FBI intercepts the email and adds a few sneaky lines of code to the original application allowing him to determine from your internet search history with up to 95% accuracy whether you like extra cheese on your pizza. The application has now been tampered with, it can no longer be trusted and you should be able to figure this out as it will no longer result in the same hash code.
But wait! Some hashing algorithms are more secure than others. MD5 is now officially considered to be 'hacked' and it is no longer recommended for doing naughty spying. Specifically, Jack will be able to inject his own code in such a way that it does not result in a different hash. Instead, the SHA family of hashers are to be used, as it is not yet known how to trick these hashers.
This is where the problem comes in, because apparently the US government has forcefully disabled the use of MD5 for all purposes. This is a shame because I use it to quickly compare bitmap icons for identicalness so I only have to store an icon in memory once. There is no security hole due to this, because I'm not hashing secure data. MD5 is somewhat faster than SHA, and since I have to hash several hundred icons on Grasshopper start, I opted for the faster one.
(Very) long story short; you're hosed. Grasshopper uses MD5; USgov does not like; Grasshopper does not run on USgov computers.
I'll do some testing to see if I can switch to SHA and then we can see whether or not that solves the problem. This however will take a while as I'm going on a business trip next week and have yet to prepare my presentations.
--
David Rutten
david@mcneel.com…
Added by David Rutten at 12:06pm on March 31, 2014
starting as soon as possible.
We're offering challenging projects, insights and contact to leading industry companies, project responsibilities according to abilities and initiative, great work environment and laid-back atmosphere, room to play and evolve,...
Our ideal candidate:
- is passionate about construction, engineering and (computational) design
- is proficient in Rhino / Grasshopper / (GH-)Python
- knows his ways around the Adobe Suite and MS Office
- has a current work permit for Germany
- is a German speaker (other native speakers also welcome, with excellent English skills)
- has an architectural background (Student / BA / MA /...), ideally with work experience
- is interested / has experience in digital manufacturing and prototyping
- will be able to join us shortly
We're looking forward to your applications / inquiries / CVs to: mpelzer@fat-lab.de
View our past projects here: www.fat-lab.com
(Current projects, unfortunately, are non-disclosed)
…
onents (radiation, sunlight-hours and view analysis) which let you study the effect of the orientation of your building and the analysis result. When you come to a question similar to "what is the orientation that the building receives the most/least amount of radiation?" is probably the right time to use this component.
HOW?
I'll try to explain the steps using a simple example. Here is my design geometries. The building in the center is the building to be designed and the rest of the buildings are context. I want to see the effect of orientation on the amount of the radiation on the test building surfaces from the start of Oct. to the end of Feb. for Chicago.
First I need to set up the normal radiation analysis and run it for the building as it is right now. [I'm not going to explain how you can set up this since you can find it in the sample file (Download the sample file from here)]
Now I need to set up the parameters for orientation study using orientationStudyPar component. You can find it under the Extra tab:
At minimum I need to input the divisionAngle, and the totalAngle and set runTheStudy to True. In this case I put 45 for divisionAngle and 180 for the totalAngle which means I want the study to be run for angles 0, 45, 90, 135 and 180.
[Note1: The divisionAngle should be divisible by totalAngle.]
[Note 2: If you don't provide any point for the basePoint, the component will use the center of the geometry as the center of the rotation.]
[Note 3: You can also rotate the context with the geometry! Normally you don't have the chance to change the context to make your design work but if you got lucky the rotateContext input is for you! Set it to True. The default is set to False.]
You're all set for the orientation study, just connect the orientationStudyPar output to OrientationStudyP input in the component and wait for the result!
The component will run the study for all the orientations and preview the latest geometry. To see the result just grab a quick graph and connect it to totalRadiation. As you can see in the graph 135 is the orientation that I receive the maximum radiation. Dang!
If you want to see all the result geometries set bakeIt to True, and the result will be baked under LadyBug> RadaitionStudy>[projectname]> . The layer name starts with a number which is the totalRadiation.
Mostapha…
her people) a tremendous amount of time creating them by hand. Dog Treat was far from perfect, however it was good enough to use almost daily.
Three years is a long time. Since 2016 my Gh knowledge has expanded and I’ve seen how dodgy some of the scripting is. With this in mind I started work on a new build. Many things have been tweaked and some things have been rebuilt from the ground up.
Everything has been designed to be leaner and be a general solution to the problem of creating dog bone corners on geometry for quick, efficient and safe CNC fabrication.
Some of these things are:
Adding prompts about user geometry to make them aware about open curves, varying curve heights and if their geometry had been altered (mostly removing unnecessary points on curves).
Smooth Transfers. If you’re in a rush and need to speed through cutting, smooth transfers mean that a lead in geometry is now created alongside the actual dog bone arc. This means the router bit doesn’t have to come to a minute stop at every corner. This is turned on by default.
Acute Angle Condition If the angle between the two curves adjacent to a dog bone point is acute, previously the dog bone corner was useless. This was because the distance between the end points of the dog bone arc were less than the diameter of the router bit. There are many ways this condition could be addressed. I chose to circumscribe a larger arc based on the original angle between the adjacent curves. While it removes more material from the corner, it minimises tool wear and any potential for material to burn.
Single Curve A single curve can now be input into Dog Treat. It will be output with both internal and external treatments.
I’ll continue to update Dog Treat as the need arises, it’s become somewhat of a hobby now. Maybe one day it will become part of a Plug-in… once I learn to code it though!
Happy Treating!
Hi Everyone,
Here's a tool I've been working on for the past 4 months or so in my free time. It's a dog bone corner generator, however it's a little different to some of the existing ones. It's designed to be used for large amounts of geometry and as such, it avoids using any curve boolean operations that are computationally taxing. You don't have to split your curves up into internal and external lots either, it works it all out so you can be lazy. I've also incorporated Lunch Box's Object Bake Component for a one click operation that bakes geometry back out to Internal and External profile layers.
Let me know how it goes, will update where necessary.
Best,
Darcy
Change Log
06/11/19 - Version 2.0 SECOND DINNER - Rebuild
29/09/17 - Version 1.3 - Now with smooth corners option, True for smooth default/False for original
18/05/17 - Version 1.2 - Now includes variable angle domain input (defaults at 90°) for angled corners
13/11/16 - slight change to enable acceptance of very large interior curves
…
Added by Darcy Zelenko at 8:44pm on November 9, 2016
ed by the NTUA School of Architecture. In its urban context, Athens presents a challenging mixture of historical diversity and current developing territories in the outskirts of the city.
During this process, participants will have the opportunity to experience the historical, contemporary, and geographical diversity of Athens during studio trips, while challenging the conventional design approach in order to break the dichotomy between the building and the urban realm.
The extreme spatial dimension of verticality will be tested through an online platform linking the workshop with AA Istanbul Visiting School which is taking horizontality as its agenda.
Deadline: 10 March 2012.
Applications can be submitted to: visitingschool@aaschool.ac.uk
For more information, visit:
http://ai.aaschool.ac.uk/
A 40% discount is available to anyone who takes part in both the Athens and the Istanbul Visiting Schools. See the APPLY section for each Visiting School for more details.…
Added by elif erdine at 1:10pm on December 21, 2011
large scale prototyping techniques. The programme continues to build on its expertise on complex architectural design and fabrication processes, relying heavily on materiality and performance. Autumn DLAB brings together a range of experts – tutors and lecturers – from internationally acclaimed academic institutions and practices, Architectural Association, Zaha Hadid Architects, among others.
The research generated at Autumn DLAB has been published in international media – ArchDaily, Archinect, Bustler – and peer-reviewed conference papers, including SimAUD (Simulation in Architecture and Urban Design), eCAADe (Education and research in Computer Aided Architectural Design in Europe).
Autumn DLAB investigates on the correlations between form, material, and structure through the rigorous implementation of computational methods for design, analysis, and fabrication, coupled with analog modes of physical experimentation and prototype making. Each cycle of the programme devises custom-made architectural processes through the creation of novel associations between conventional and contemporary design and fabrication techniques. The research culminates in the design and fabrication of a one-to-one scale prototype realized by the use of robotic fabrication techniques, with the aim of integrating of form-finding, material computation, and structural performance.
The programme is structured in two stages:
PART 1 – participants are introduced to core concepts of material processes, computational methods and digital fabrication techniques. Basic and advanced tutorials on computational design and analysis tools are provided. The programme performs as a team-based workshop promoting collaboration, research and ‘learning-by-experimentation’.
PART 2 – participants propose design interventions based on the skills and knowledge gained during phase 1 and supported by scaled study models and prototypes. The fabrication and assembly of a full-scale architectural intervention with the use of robotic fabrication techniques will then unify the design goals of the programme.
Applications
1) A limited number of 10 places are available. To apply, please send a small portfolio (5MB) to the Visiting School Office.2) PARTIAL SCHOLARSHIPS ARE AVAILABLE. Please send a letter of intent and a small portfolio (5MB) to the Visiting School Office.3) As this programme has a limited number of places it requires a selection process, if you are offered a place on programme, the Visiting School Office will inform you of how you can complete the registration process.
The deadline for applications is 13 AUGUST 2021.
Eligibility
The workshop is open to current architecture and design students, PhD candidates and young professionals. Software Requirements: Adobe Creative Suite, Rhino 6. No prior knowledge of software tools is required for eligibility.
Fees
The AA Visiting School requires a fee of £975 per participant, which includes a £60 Digital Membership fee.Students need to bring their own laptops, digital equipment and model making tools.
…
ientas digitales en el proceso de diseño desde una postura de conocimiento aplicado. Así, a partir del aprendizaje de herramientas digitales y lenguajes de programación específicos, en paralelo a una constante reflexión entorno al origen de estas herramientas y su uso, se crea una plataforma de experimentación y definición de aplicaciones reales sensibles al contexto social, técnico y económico donde serán usadas.
Diferentes perfiles, diferentes búsquedas, un sólo enfoque. Respondiendo a ésta premisa, proponemos un programa de educación especializada diseñado a partir de una estructura flexible y de amplio espectro, donde la obtención del grado depende de un número de créditos acumulados al cursar cuatro de los ocho talleres optativos y dos talleres obligatorios. Dichos talleres, agrupados en tres categorías (Herramientas digitales, Exploración aplicada y Proyecto síntesis) tienen como objetivo otorgar un conocimiento práctico de ciertas herramientas digitales, técnicas constructivas y estrategias teóricas, para formar un criterio propio entorno a su uso y aplicación.…
Added by Alberto Lara at 11:35am on February 11, 2012
rametriche all’interno del processo progettuale, approfondendo l’utilizzo di Grasshopper in sinergia con plug-in, software di analisi ambientale e simulazione fisica. Obiettivo fondamentale è la generazione della forma come risultato di tecniche di form-finding e di input ambientali (solari, termici e acustici). Verranno acquisiti nuovi strumenti operativi e di simulazione al fine di costruire modelli parametrici ottimizzati in grado di adattarsi a diverse condizioni di contesto.
tutors: Arturo Tedeschi + Maurizio Degni
Arturo Tedeschi_autore del primo libro su Grasshopper "Architettura Parametrica"__Authorized Rhino Trainer__co-director della AA Rome Visiting School - Architectural Association School (London).
info + prenotazioni: http://www.arturotedeschi.com/wordpress/?project=ecologic-patterns_...…