Rain

💻 Rhino 5

🔼 Rhino Script

🛠️ Visual Basic

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Part of a library of environmental effect graphics generators this Rhino Script produces a series of lines that fall like rain upon Rhino’s cplane.  If a droplet hits there is a splash. The user can input the number clusters where the rain will fall from, the relative radius of the cluster, the percentage of the way that the rain can fall short as well as a few other conditions.  The rain is colored with a gradient according to the distance along the V domain of the surface to allow for the production of depth.

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Option Explicit
'Script written by <insert name>
'Script copyrighted by <insert company name>
'Script version Sunday, March 28, 2010 5:08:39 PM
 
Call Main()
Sub Main()
    Dim strSurface, arrInputs
    strSurface = Rhino.GetObject("Select Surface to Rain From", 8, True)
    If isNull(strSurface) Then Exit Sub
     
    arrInputs = Rhino.PropertyListBox(array("Sources", "Stream Radius", "Droplets", "Rate 0-1", "Splash Radius", "Stream Angle Radius"), array(50, 0.1, 10, 0.5, 0.5, 4), "Rain Parameters", "Rain Parameters")
    If isNull(arrInputs) Then Exit Sub
     
    Call reparameterize(strSurface) 
    Call Rhino.EnableRedraw(False)
    Call rainMaker(strSurface, arrInputs(0), arrInputs(1), arrInputs(2), arrInputs(3), arrInputs(4), arrInputs(5))
    Call Rhino.EnableRedraw(True)
     
End Sub
Function rainMaker(strSurface, dblCount, dblDispersion, dblDensity, dblRate, dblSplash, dblVarience)
    rainMaker = Null
    Dim i, j, k, a, w, v, s, t, u, z, clr, var
    Dim srfDom(1),srfD(1),srfA(1),srfR(1),srfS(1),srfE(1),pt(1), r(1)
    Dim ln(), spl(), temp(3)
     
    For i = 0 To 1 Step 1
        srfDom(i) = Rhino.surfacedomain(strSurface, i)
        srfD(i) = (srfDom(i)(1) - srfDom(i)(0))
        srfA(i) = srfD(i) - srfD(i) * dblDispersion
        srfR(i) = srfD(i) * (dblDispersion / 2)
        srfS(i) = srfDom(i)(0) + srfD(i) * (dblDispersion / 2)
        srfE(i) = srfDom(i)(1) - srfD(i) * (dblDispersion / 2)
    Next
     
    w = 0
    a = 0
    var = rnd()
    For i = 0 To dblCount Step 1
        u = srfS(0) + rnd() * srfA(0)
        v = srfS(1) + rnd() * srfA(1)
        r(0) = srfR(0) / 2 + rnd() * (srfR(0) / 2)
        r(1) = srfR(1) / 2 + rnd() * (srfR(1) / 2)
        clr = v / srfE(1)
        For j = 0 To dblDensity Step 1
            ReDim Preserve ln(w)
            pt(0) = Rhino.EvaluateSurface(strSurface, array(u + rnd() * r(0), v + rnd() * r(1)))
            pt(1) = array(pt(0)(0) + dblVarience * sin(PI * 2 * var), pt(0)(1) + dblVarience * cos(PI * 2 * var), 0)
            t = 1 - rnd() * dblRate
            ln(w) = Rhino.ScaleObject(Rhino.AddLine(pt(0), pt(1)), pt(0), array(t, t, t), False)
            pt(1) = Rhino.CurveEndPoint(ln(w))
             
            Call Rhino.ObjectColor(ln(w), RGB(clr * 255, clr * 255, clr * 255))
             
            If pt(1)(2) < 0.1 Then
                ReDim Preserve spl(a)
                For k = 0 To 3 Step 1
                    t = rnd()
                    temp(k) = Rhino.AddLine(pt(1), array(pt(1)(0) + dblSplash * sin(PI * 2 * t), pt(1)(1) + dblSplash * cos(PI * 2 * t), pt(1)(2) + dblSplash * sin(PI * t)))
                    Call Rhino.ObjectColor(temp(k), RGB(clr * 255, clr * 255, clr * 255))
                Next
                spl(a) = temp
                a = a + 1
            End If
            w = w + 1
        Next
    Next
     
    rainMaker = array(ln, spl)
End Function
Function reparameterize(strObjectID)
    If Rhino.IsCurve(strObjectID) = True Then
        Call rhino.SelectObject(strObjectID)
        Call rhino.Command("reparameterize 0 1", False)
        Call rhino.UnselectAllObjects()
    End If
    If Rhino.IsSurface(strObjectID) = True Then
        Call rhino.SelectObject(strObjectID)
        Call rhino.Command("reparameterize 0 1 0 1", False)
        Call rhino.UnselectAllObjects()
    End If
End Function

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