How to determine a face’s normal?


Thanks! Great support as usual!

Yes, I need the face, not vertex, normal. I’ll keep an eye out for 5.09.


I’m trying to determine a selected face’s normal. The code snippet below tries to get the object index (I think) of the normal but results in an andquot;Object variable or With block variable not set (91)andquot; message when run. The code seems to follow that in the Direct-X script, what am I missing?

My assumption is that Face.GetNormal should yield an object normal index which can be used with
Object.GetNormal the_index, NormalX, NormalY, NormalZ. Thanks in advance!

Language = VBScript

‘ Purpose: Find normal of a face

Option Explicit andnbsp; andnbsp; andnbsp; andnbsp; andnbsp;’require variable declarations

Sub Main (3DCApp)

andnbsp; andnbsp;Dim Scene, Object, Face
andnbsp; andnbsp;Dim ActiveObjectCount
andnbsp; andnbsp;Dim ActiveFaceCount
andnbsp; andnbsp;Dim Normal
andnbsp; andnbsp;Dim Nx andnbsp; andnbsp;’ returned X normal
andnbsp; andnbsp;Dim Ny andnbsp; andnbsp;’ returned Y normal
andnbsp; andnbsp;Dim Nz andnbsp; andnbsp;’ returned Z normal
andnbsp; andnbsp;Dim NLength ‘ Face’s normal length

andnbsp; andnbsp;’get the scene
andnbsp; andnbsp;Set Scene = 3DCApp.GetActiveScene

andnbsp; andnbsp;’get the active object count
andnbsp; andnbsp;ActiveObjectCount = Scene.GetActiveObjectCount

andnbsp; andnbsp;’get the active face count
andnbsp; andnbsp;ActiveFaceCount = andnbsp;Scene.GetActiveFaceCount

andnbsp; andnbsp;’only proceed if there is an active object and 1 active face
andnbsp; andnbsp;If ActiveObjectCount [] 1 Then

andnbsp; andnbsp; andnbsp; andnbsp;MsgBox andquot;Please select ONE object.andquot;

andnbsp; andnbsp;ElseIf ActiveFaceCount [] 1 Then

andnbsp; andnbsp; andnbsp; andnbsp;MsgBox andquot;Please select ONE face.andquot;
andnbsp; andnbsp;Else

andnbsp; andnbsp; andnbsp; andnbsp;Set Object = Scene.GetActiveObject(0)
andnbsp; andnbsp; andnbsp; andnbsp;Set Face = Scene.GetActiveFace(0)

andnbsp; andnbsp; andnbsp; andnbsp;’ get 1st (and only?) normal
andnbsp; andnbsp; andnbsp; andnbsp;’ the statement below results in andquot;Object variable or
andnbsp; andnbsp; andnbsp; andnbsp;’ With block variable not setandquot; (91)
andnbsp; andnbsp; andnbsp; andnbsp;Normal = Face.GetNormal(0)
andnbsp; andnbsp; andnbsp;
andnbsp; andnbsp;End if
End Sub

I believe that is an attribute of the forum software(built in foul language support). It tends to change certain words like andquot;a s sandquot; as in – assume. It does the same thing with andquot;c o c k pitandquot; as in – cockpit
Kinda cute huh?
Les……………….. ;D

How the heck did that happen? Please read andquot;assumeandquot; in lieu of andquot;disagreeumptionandquot; in the previous post.


Thanks for the response, I’ll be looking for 5.09.


Woops. That’s a bug. I’ll fix it for 5.0.9.



I have fixed this for 5.0.9 which should be available relatively soon. Also, I have added a new method andquot;GetFaceNormalandquot;. The only method was to get the face’s vertex normals. (a different thing and not likely what you were looking for).


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