void setupParticleSystem(Autodesk.Revit.DB.Face f, int uDiv, int vDiv, double springDampening, double springRestLength, double springConstant, double mass)
{
BoundingBoxUV bbox = f.GetBoundingBox();
double uStep = (bbox.Max.U - bbox.Min.U) / uDiv;
double vStep = (bbox.Max.V - bbox.Min.V) / vDiv;
for (int j = 0; j <= uDiv; j++) // Y axis is outer loop
{
double u = bbox.Min.U + uStep * j;
for (int i = 0; i <= vDiv; i++) // X axis is inner loop
{
double v = bbox.Min.V + vStep * i;
Particle a = particleSystem.makeParticle(mass, f.Evaluate(new UV(u, v)), false);
if (i > 0)
{
particleSystem.makeSpring(particleSystem.getParticle((i - 1) + (j * (vDiv + 1))), a, springRestLength, springConstant, springDampening);
}
if (j > 0)
{
Particle b = particleSystem.getParticle(i + ((j - 1) * (vDiv + 1)));
particleSystem.makeSpring(a, b, springRestLength, springConstant, springDampening);
}
if (i == 0 || i == vDiv || j == 0 || j == uDiv)
{
a.makeFixed();
}
}
}
}
public override Value Evaluate(FSharpList <Value> args)
{
Reference faceRef = (args[1] as Value.Container).Item as Reference;
Autodesk.Revit.DB.Face f = (faceRef == null) ?
((args[1] as Value.Container).Item as Autodesk.Revit.DB.Face) :
dynRevitSettings.Doc.Document.GetElement(faceRef).GetGeometryObjectFromReference(faceRef) as Autodesk.Revit.DB.Face;
XYZ face_point = null;
if (f != null)
{
//each item in the list will be a reference point
UV param = (UV)(args[0] as Value.Container).Item;
face_point = f.Evaluate(param);
}
return(Value.NewContainer(face_point));
}