VBA中如何得到一条直线与球体的交点坐标
请问大虾：VBA中如何得到一条直线与球体的交点坐标？我用给的例子：
Sub Example_IntersectWith()
' This example creates a line and circle and finds the points at
' which they intersect.
' Create the line
Dim lineObj As AcadLine
Dim startPt(0 To 2) As Double
Dim endPt(0 To 2) As Double
startPt(0) = -13: startPt(1) = 1: startPt(2) = 0
endPt(0) = 12: endPt(1) = 5: endPt(2) = 0
Set lineObj = ThisDrawing.ModelSpace.AddLine(startPt, endPt)
Dim sphereObj As Acad3DSolid
Dim centerPoint(0 To 2) As Double
Dim radius As Double
centerPoint(0) = 0#: centerPoint(1) = 0#: centerPoint(2) = 0#
radius = 10#
Set sphereObj = ThisDrawing.ModelSpace.AddSphere(centerPoint, radius)
' Find the intersection points between the line and the circle
Dim intPoints As Variant
intPoints = lineObj.IntersectWith(sphereObj, acExtendNone)
' Print all the intersection points
Dim I As Integer, j As Integer, k As Integer
Dim str As String
If VarType(intPoints)vbEmpty Then
For I = LBound(intPoints) To UBound(intPoints)
str = "Intersection Point[" & k & "] is: " & intPoints(j) & "," & intPoints(j + 1) & "," & intPoints(j + 2)
MsgBox str, , "IntersectWith Example"
str = ""
I = I + 2
j = j + 3
k = k + 1
Next
End If
End Sub
总是出现下面的错误：
该怎么解决啊？急！！！
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