Grasshopper Tutorial 10 | Other Ways to Create Surfaces

all right so in this video I would like to show you some more options for creating surfaces and for that I have prepared this rectangle and I'm going to use a 4-point surface and then use the four corners as input for this surface very simple now to get at those points I of course need a list item block with 4 in DC's I'm going to plug in this list and then that will give me access to the 4 points and I can start plugging them whoops connected the edges not the corners here we go so now I've got this simple surface and you can see that if you mess something up in the order you get a twisted surface now to make things a little bit more interesting and to show you that the 4-point surface can actually work on non planar or create long planar surfaces I'm going to move two of these points so let's move that point I'll connect with incorrectly here we go let's do it right this time there we go and now we've got this hyperbolic surface now the next command I show you can't deal with non planar surfaces but it can take more than four points or generally can take arbitrary shapes as long as they lie inside a single plane and also prepare something for that so I'm gonna hide this and show you this polyline that I've drawn and you can see that one point is actually lying outside the plane so if I now create a curve okay SEP 1 curve uses polyline and they go to boundary surface if I plug this in it will give me a warning saying that the planar surface routine returned no results because this point is outside of the plane of the other points so I am actually going to move that point back to where it belongs and for that I'm going to select polyline turn on the control points and then move that down into the plane of the origin and now you can see that the boundary surface can give us a result now if we have some form of curve we can of course also extrude it and we've already done this previously so this shouldn't be anything new to you I'm going to take that curve plug it in and extrude it in said direction let's put a slider in front of that there we go now when you extrude things you often also want to fill the ends of that extrusion or if you do it pipe or if you do some form of you you've suite for example a circle along a rail you want to close the ends of that and for that there's a command a block called cap so if you simply attach that to the result of this extrude you'll see that it closes both ends of that extrusion now after covering covering these fairly straightforward and shapes and and surfaces I would like to show you some more cool them more freeform friendly options I'm gonna hide all of this again and I am going to draw myself to curve so I'm going to go to the front and I'm going to it's actually just hide this here okay I'm going to draw one curve front and one on the right and now I'm going to move this curve so that they touch have their end points and so now I've got these two curves and now I can use something called a some surface and some surface simply takes two curves set the first curve set second curve and plug them into the subsurface you can see that it kind of intersects these two curves in space and you can do similar things with four curves if you use the edge surface command so whether you can plug in two curves here you can actually have and you get the same curve which you have on this side on this side if you use an edge surf you can use four different curves on all sides you can already see that it's quite easy or simple to create quite crazily shape surfaces using grasshopper right now I'm going to show you something it takes it even further so let's delete this and let's bring back our polyline and I'm going to turn on the control points again I'm going to start moving them up to create this kind of I'll know what it would be maybe the edge of a roof structure and bring it back into Rhino sorry grasshopper going set one curve and now I can use the where is it fragment hatch which simply takes a polyline and then creates a surface between it usually out of triangles but it also sometimes depending on what your play line looks like you also have rectangular surfaces in it but these surfaces are all or these facets of it are all planar right so let's go even further I'm going to take this polyline and I'm going to obtain the control points as it control points I'm going to use these points to create a new curve create a NURBS curve from those control points there we go so let's hide all this hide that again hide the control points so now we've got this polyline sorry this this curve through space and we can use patch command a patch surface on that curve where is it there we go so plug in the curve and I'm actually going to bake it because then it gets slightly easier to see what the output is until you've got this wavy shaped surface and what are the inputs of this patch surface is spans so which by default is 20 so I'm going to create a slider to change that and as you change these spans you can see that it is less able to follow that outer definition line and if I bake this again you'll see the difference and this is because if I actually go back to the shaded perspective you can actually see that UV lines all those two surfaces so here it's got a lot more of these spans to control where the surface is supposed to go along and here it's got a lot less so it's less able to follow that original contour and once again this just shows that using Rhino and grasshopper or any other 3d CAD programs it's relatively easy to create very natural flowing surfaces and forms but the issue then usually becomes how do I turn this very free surface into something that can be built and this is why we think it's very important that you think before you create your surfaces because often it you can create very surfaces that are very similar to the fully freeform surface but because they're based on simpler geometries they become they're a lot more straightforward to then actual actually construct so often by just turning on your brain a little bit earlier you can save yourself a lot of effort and pain in the long run as you're something to keep in mind when you're creating these surfaces thank you for watching

Channel: Individualized Production in Architecture

Views: 21,115

Rating: 4.9126639 out of 5

Keywords: Grasshopper, RWTH

Id: O3ar0rc39X4

Length: 10min 55sec (655 seconds)

Published: Thu Nov 17 2016