In this tutorial, we will be taking a detailed look at each of the Math Basic nodes found in Softimage's Interactive Creative Environment. Each video in this course is a self-contained tutorial centering on one of the nodes found in ICE within Softimage. This means that these tutorial can be viewed in any order you wish, allowing you to jump straight to the content that is most relevant to you. These tutorials will take a detailed look at each of the nodes found within the Math Basic section of ICE and we'll learn how they can be used to speed up our workflow. Software required: Softimage 7 and higher.
Introduction and Project Overview The Absolute Value node will take the incoming value and make it absolute, by changing the sign of all negative values to positive and leaving the positive ones as is. So here we will take a look at how we can use the Absolute Value to change gravity force into antigravity. So, let's build a particle simulation. I have a little emitter tucked away inside of this faucet, where the water particles will come out from. So when it's selected, go to Simulate, Ice, Create Emit Particles from Selection. Hit Play and we should have a string of particles coming out. Because it's at an incline, the particles will move in that direction. We want these to fall down as if they were being pulled by gravity. We'll need to introduce some forces into our simulation. Hit the update button to focus on the ice graph here, and then add in Add Forces node. Connect the Add Forces node into Port 2. And now if we want to add gravity, we just need to get a hold of the Gravity Force. So type in the letters for the word gravity, drop in the existing Gravity Force and connect it. Hit the y and Play, and now the particles will be pulled down by gravity and they begin to descend like so. Now, if we wanted these particles to move upwards, or in an antigravity fashion, all we have to do is grab an Absolute Value node and then we just need to plug it inbetween these two. So connect the Forces to Incoming Value and connect the result into the Force 1. Now when we hit the y and play, the particles will drift upwards, instead of falling downwards, because our Gravity Force has a y value of negative 9. That will be, that will pass to the Absolute Value and become positive 9, moving the particles upwards. Values like 0, or any positive values are not affected and are left as is. Let's look at the Absolute Value. Keep in mind it just converts negative values to positive values and leaves everything else as is.