static public VFXExpression TorusVolume(VFXExpression majorRadius, VFXExpression minorRadius, VFXExpression scale = null)
{
//(pi * r * r) * (2 * pi * R)
var volume = CircleArea(minorRadius) * CircleCircumference(majorRadius);
if (scale != null)
{
scale = new VFXExpressionAbs(scale);
volume = volume * scale.x * scale.y * scale.z;
}
return(volume);
}
static public VFXExpression SphereVolume(VFXExpression radius, VFXExpression scale = null)
{
//(4 / 3) * pi * r * r * r
var multiplier = VFXValue.Constant((4.0f / 3.0f) * Mathf.PI);
var volume = (multiplier * radius * radius * radius);
if (scale != null)
{
scale = new VFXExpressionAbs(scale);
volume = volume * scale.x * scale.y * scale.z;
}
return(volume);
}
static public VFXExpression CircleArea(VFXExpression radius, VFXExpression scale = null)
{
//pi * r * r
var pi = VFXValue.Constant(Mathf.PI);
var area = pi * radius * radius;
if (scale != null) //Circle are inside z=0 plane
{
scale = new VFXExpressionAbs(scale);
area = area * scale.x * scale.y;
}
return(area);
}
static public VFXExpression ConeVolume(VFXExpression radius0, VFXExpression radius1, VFXExpression height, VFXExpression scale = null)
{
//pi/3 * (r0 * r0 + r0 * r1 + r1 * r1) * h
var piOver3 = VFXValue.Constant(Mathf.PI / 3.0f);
var r0r0 = (radius0 * radius0);
var r0r1 = (radius0 * radius1);
var r1r1 = (radius1 * radius1);
var result = (r0r0 + r0r1 + r1r1);
var volume = (piOver3 * result * height);
if (scale != null)
{
scale = new VFXExpressionAbs(scale);
volume = volume * scale.x * scale.y * scale.z;
}
return(volume);
}