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Cloth Simulation: Controlling it with Weight Maps

By Neptune Image - Kashif C. Riley
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Date Added: 9th December 2009
Software used:
Softimage
515_tid_Nice-Tanktop-Lady!!!.jpg

Introduction

While I was working on an animation project, I was struggling a little bit on how to get a localized effect on getting cloth simulation to work on a character. So, I took a small hiatus on my own character and opened and old scene to test my theory on a way to control my cloth. A lot of artists like me having tried many different ways to get cloth simulation working and have struggled constantly. And pulled out my hair trying to get good results. With this tutorial, I am going to share with you how to control your cloth simulations using weight maps on the mesh directly (this is especially useful on things like clothing on characters or a burning table cloth where you would actually have to create an image that changes over time to control the effect.). This is aimed at those who want to learn a bit on how to create localized effects on cloth for their projects and have some familiar knowledge of the weight paint tools. I am using SOFTIMAGE|XSI 5.11 FND, but this should work in other packages just fine as long as it supports connecting parameters like weight maps.

Getting Started

So, to begin this exercise, let's open up a scene in XSI where you have an object driven by Cloth Simulation. I am using a default character from XSI Model Primitives, but the examples will work regardless. It will also help to have some sort of animation on the model to sell this effect and all of the collisions already in place.

Here is a screenshot of my scene with the character in the bind pose. The bind pose is a good way to let the cloth "set" onto the model and prepare it to sync with the animation. And make sure that cloth has room to settle.

515_tid_Character-In-Bind-Pose.jpg
Now with your character in place (okay, at the time of this test, I didn't have my own character so I am using this one), let us set up the cloth to be simulated. You should already have the Cloth Op applied on the cloth object, in this case the dress which also has and envelope applied as well. If you look at my explorer, you can see how the operators are set up so the cloth responds properly.

515_tid_Cloth-Object-Settings.jpg
Oh, and if you wondering why there is a Mesh Local Subdivision Op in my explorer, you may be asking yourself, "Ok, why is Kashif using that operator when his cloth is going to be a Subdivision surface anyway?". Well, for the purposes of getting some good cloth, you need to have some polygons so the cloth will look natural and respond properly to the characters motion. So, in XSI, to get this operator, select the polygons on the cloth and right click on the object, and select Local Subdivision Refinement. And on the pop up, set the Subdivision Level to 2 (or more depending on how fine you want the cloth to look and your system resources available. 3 is the highest I would go depending on your object's density. Also this would be a great time to apply UV maps to your model and freeze the UV's. You don't have to, but it would serve as a backup if you want to use Texture maps instead to drive parameters. But I love the localized nature of Weight Maps J . And also decide on a mesh resolution before you apply/paint weight maps and cloth sim) and leave the rule to Catmull-Clark.

515_tid_Subdivision-Operator.jpg
Here is the result of the cloth.

515_tid_Subdivision-Result.jpg
Now with all of this set up, let's review your cloth sim settings before we apply weight maps. On my skirt (crudely modeled), I have all of my parameters set up so that it looks like it is very silky.

515_tid_Cloth-Sim-Setup.jpg

In my case of the dress, I am concerned with the Initial Tension, Shear, and Bend parameters that I want to control with weight maps. See the nice "plugs" next to some of the parameters? Those are controllable with controls like Shrinkwraps, push, and my favourite, Weight Maps. Now with this setup, let's create the weight maps. Select all the points on the cloth (remember, we want natural cloth) and go to Model>Properties>Weight Maps.

515_tid_Creating-our-Weight-maps.jpg
When the property editor pops up, leave everything at its default; we'll deal with our weight in a moment.

515_tid_Weight-map-pop-up.jpg

 
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