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Hey guys, this is Eric back at you again and we’re going to do another simple Houdini Tutorial. On this time, we’re going to simulate cloth.
Let’s start with out ever famous grid. Back control click in our grid. And there we go, we have our famous grid. The first thing I'm going to do is I'm going to bring it up here a little bit, and then I'm going to double click and go into my grid like that. The mouse was been funny. And now, I should be using my pen but I'm just too lazy right now. So now, we got our grid object in here. Let’s go ahead and up our rows in columns to about 40 each. We put 40 rows, 40 columns, and now as you can see, it’s a lot denser. We can change it from polygon to mesh and change it to triangles. Now, you can see we have this little triangles and it’s very dense with 40 rows and 40 columns.
So now, what we’re going to do is we’re going to add a node to this grid and it’s the spring node. So I'm going to right click on my output, we’ll hit tab. Go down to polygon or particle and select spring or just tab and start typing spring. Now, I have this spring node here. So we need to make a few adjustments in my spring node. So, first of all, let’s go to forces. External force would make it -2.5. And when we do this, you will see when I play the simulation it just falls. It’s no big deal.
So let’s do a few more adjustments. Let’s go to our nodes and let’s make our spring in constant, 1000. Now, let’s go to our limits tab and make our gain tangent .2, and make our gain normal .2. So now, under our limits tab, we have the gain normal, and gain tangent set to .2. We have under our nodes, we have our spring constant or our stiffness set to 1000. Under forces, we have a -2.5 four set, so it will fall straight down kind of like gravity. And under states, we have this time. We start time and preroll in this time here. What we’re going to do is the lower the number; the more sampling it’s going to do. So, before I flow with this, I'm going to go ahead and tab in a box node. What were going to do is I'm going to transform this by making it longer and we’re going to bring it down here like this.
Now, as you can see we have our little box and we have our grip. So now, what we need to do is pop our box into our second input of our spring, and when we do this, you will see we get a little blue outline at our box. And now, when I go back and play, you can see we have problems. When you play it, you can see total explosion there. But that’s okay, that’s fine. That’s what it’s supposed to do. That’s because we haven’t change our time up here. So go into your time and let’s say .1. We’ll make it real low. We’ll make it sample. Hit return. Now, when I go and replay my animation here, you can see we have a really good cloth animation. As you can see, it simulates it fairly well. And you can go in and fit it with your settings, how you want it, how stiff you want it and how un-stiff you want it, how you want it. It’s all up to you and all up to your settings and how you set things. So as you can see, we got that set up pretty good. It can take a few minutes. Here’s a quick render of one, as you can see here, I just rendered my name out and have this cloth here, dragging over my name.
So you get the basic just to that. So this was a basic short tutorial on how to simulate cloth. One way, of course there’s several ways to do it. This is just a simple way I want to show you guys to get you familiar. So if you have any questions, get a hold of me, I’ll be more than happy to answer if I can and we’ll see you in the next video. I love you guys.