Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00.05 --> 00:00:02.09 - [Instructor] With every generative design algorithm, 2 00:00:02.09 --> 00:00:05.03 we need inputs and outputs. 3 00:00:05.03 --> 00:00:08.01 Inputs are required to generate options 4 00:00:08.01 --> 00:00:11.02 and outputs are used to evaluate those options. 5 00:00:11.02 --> 00:00:14.05 So let's have a look at how inputs and outputs are specified 6 00:00:14.05 --> 00:00:17.01 in a generative design script. 7 00:00:17.01 --> 00:00:20.00 For this lesson, I have the exercise file open 8 00:00:20.00 --> 00:00:22.09 which is the sample file provided by Autodesk 9 00:00:22.09 --> 00:00:25.05 for the three box massing study. 10 00:00:25.05 --> 00:00:28.08 This study allows us to move and adjust the height 11 00:00:28.08 --> 00:00:30.08 of three different cuboids 12 00:00:30.08 --> 00:00:34.02 in order to optimize their location and size 13 00:00:34.02 --> 00:00:38.00 to find a form which has a minimal surface area 14 00:00:38.00 --> 00:00:39.08 and a maximum floor area. 15 00:00:39.08 --> 00:00:43.04 In this script, it's broken up into three sections. 16 00:00:43.04 --> 00:00:47.00 We have the inputs in these pink blocks. 17 00:00:47.00 --> 00:00:50.04 We have the workings or the algorithms of the script 18 00:00:50.04 --> 00:00:52.08 in these light green blocks. 19 00:00:52.08 --> 00:00:56.01 And then we have the outputs in these orange blocks. 20 00:00:56.01 --> 00:00:59.05 We also have a way to integrate with Revit in this gray box, 21 00:00:59.05 --> 00:01:02.01 which we'll look at later on. 22 00:01:02.01 --> 00:01:07.02 For now, let's focus on the inputs and the outputs. 23 00:01:07.02 --> 00:01:11.02 Inputs control what data a generative design script can use 24 00:01:11.02 --> 00:01:14.03 to generate different design options. 25 00:01:14.03 --> 00:01:17.05 These need to be easily adjustable and measurable. 26 00:01:17.05 --> 00:01:20.03 Therefore, there are a limited number of data types 27 00:01:20.03 --> 00:01:22.04 that could be used as an input. 28 00:01:22.04 --> 00:01:27.05 These include a number slider, 29 00:01:27.05 --> 00:01:32.04 an integer slider, 30 00:01:32.04 --> 00:01:39.02 or we could have a blend toggle. 31 00:01:39.02 --> 00:01:42.05 We could also have Revit selection nodes. 32 00:01:42.05 --> 00:01:44.09 Revit selection nodes are not adjusted 33 00:01:44.09 --> 00:01:47.03 during the generative design algorithm. 34 00:01:47.03 --> 00:01:49.07 However, they are used to allow the user 35 00:01:49.07 --> 00:01:53.07 to select elements in the Revit model. 36 00:01:53.07 --> 00:01:56.02 From these elements, we can then extract data 37 00:01:56.02 --> 00:01:59.01 to be used in the algorithm in some way. 38 00:01:59.01 --> 00:02:00.08 These set of selection elements 39 00:02:00.08 --> 00:02:03.08 are found within the generative design tab 40 00:02:03.08 --> 00:02:06.02 in the node library, and then selection. 41 00:02:06.02 --> 00:02:09.02 Here we can find a selection of different select nodes 42 00:02:09.02 --> 00:02:12.01 which will show up on the study dialogue. 43 00:02:12.01 --> 00:02:13.02 It's important to note here 44 00:02:13.02 --> 00:02:15.09 that if you're using Project Refinery Beta, 45 00:02:15.09 --> 00:02:18.09 you'll need to use the dynamo selection nodes 46 00:02:18.09 --> 00:02:23.00 that are provided in the Revit and then selection tab. 47 00:02:23.00 --> 00:02:26.00 These generative design selection nodes down the bottom 48 00:02:26.00 --> 00:02:28.07 are designed to work from within the Revit dialogue, 49 00:02:28.07 --> 00:02:32.00 which isn't available with Project Refinery. 50 00:02:32.00 --> 00:02:33.09 The dynamo script that we're looking at 51 00:02:33.09 --> 00:02:36.01 uses only one type of input. 52 00:02:36.01 --> 00:02:40.04 And that is the integer slider. 53 00:02:40.04 --> 00:02:42.07 Each of these are used to control the heights 54 00:02:42.07 --> 00:02:45.09 and the position of the different cuboids. 55 00:02:45.09 --> 00:02:47.00 With each of these nodes, 56 00:02:47.00 --> 00:02:50.00 simply placing them does not make it an input 57 00:02:50.00 --> 00:02:51.09 for the generative design study. 58 00:02:51.09 --> 00:02:54.04 To make them an input that shows up in Revit, 59 00:02:54.04 --> 00:02:56.05 we need to identify them as such. 60 00:02:56.05 --> 00:02:59.07 And we can do this by right clicking the node title 61 00:02:59.07 --> 00:03:02.04 and selecting is input. 62 00:03:02.04 --> 00:03:05.03 As we can see, the sliders that are in the script 63 00:03:05.03 --> 00:03:08.04 are already set as inputs. 64 00:03:08.04 --> 00:03:10.08 If we open up the generative design studies 65 00:03:10.08 --> 00:03:13.07 by going to the generative design tab at the top 66 00:03:13.07 --> 00:03:16.09 and selecting create study, 67 00:03:16.09 --> 00:03:19.03 and then going to three box massing, 68 00:03:19.03 --> 00:03:22.00 we can see that these input sliders have shown up 69 00:03:22.00 --> 00:03:23.09 as the variables. 70 00:03:23.09 --> 00:03:26.03 And each of these sliders have been renamed, 71 00:03:26.03 --> 00:03:30.02 which is identified by these yellow tags. 72 00:03:30.02 --> 00:03:32.03 We can rename a node by right clicking it 73 00:03:32.03 --> 00:03:34.03 and selecting rename node. 74 00:03:34.03 --> 00:03:37.01 And then whatever we have here as the name will show up 75 00:03:37.01 --> 00:03:42.08 as the variable name in the dialogue. 76 00:03:42.08 --> 00:03:44.06 Outputs are similar to inputs 77 00:03:44.06 --> 00:03:47.08 in that we need to specify a node as an output. 78 00:03:47.08 --> 00:03:50.04 However, for outputs, these can only be nodes 79 00:03:50.04 --> 00:03:53.07 that result in a number value such as a watch node 80 00:03:53.07 --> 00:03:56.02 or a subtraction node, for example. 81 00:03:56.02 --> 00:03:58.01 To define a node as an output, 82 00:03:58.01 --> 00:04:01.09 we simply right click it and select is output. 83 00:04:01.09 --> 00:04:04.06 These can also be renamed too. 84 00:04:04.06 --> 00:04:06.09 In this script, there are two nodes as outputs 85 00:04:06.09 --> 00:04:08.04 which if we hover over, 86 00:04:08.04 --> 00:04:11.04 we can see was originally a watch node. 87 00:04:11.04 --> 00:04:17.05 If we open up the study again, 88 00:04:17.05 --> 00:04:19.07 we can see that those two nodes 89 00:04:19.07 --> 00:04:22.04 which are outputs have appeared as goals. 90 00:04:22.04 --> 00:04:25.01 We have floor area and surface area. 91 00:04:25.01 --> 00:04:28.03 Outputs are therefore used to indicate the metrics 92 00:04:28.03 --> 00:04:29.07 that have been calculated 93 00:04:29.07 --> 00:04:32.07 during the generative design process. 94 00:04:32.07 --> 00:04:35.08 You could think of these as the score of the design 95 00:04:35.08 --> 00:04:38.02 and for an optimization study, 96 00:04:38.02 --> 00:04:40.09 these are either maximized or minimized 97 00:04:40.09 --> 00:04:44.04 to allow the algorithm to find the best solutions. 98 00:04:44.04 --> 00:04:47.02 In this case, if we run the script, 99 00:04:47.02 --> 00:04:48.08 we can see two values 100 00:04:48.08 --> 00:04:51.00 which indicate the score of this design. 8058