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Isosurface

Isosurface are very interesting.
It may be weird and tricky to manipulate at first glance but it's a very powerfull way of making geometrie and volumes.
You can generate shapes using mathematical expression in X, Y and Z using the corresponding Houdini's variables $X, $Y and $Z
I've also add some expression function like sind and cosd standing for sin and cosin in degrees. Indeed, Houdini is working in radian by default.
You can describe function like this:
The sind expression:
float sind(float val) {
    return sin(deg(val));
}

The cosd expression:
float cosd(float val) {
    return cos(deg(val));
}