Re: [script] Normals - not understanding

["Bernard Lebel" <3dbernard(at)gmail.com>]

Nope, you are spot on Mathieu. That's exactly what I was trying to do.

In hopes of understanding this more......


Do you mind explaining why you did this?

vZ = ovGlobalNormal;
vY.Set(0, 1, 0);
vX.Cross(vY, vZ);
vY.Cross(vZ, vX);


Thanks
Bernard


On 10/18/06, Mathieu Leclaire <mleclair(at)hybride.com> wrote:
> I'm sorry... I'm not sure I understand what you are looking for... did I
> anwser your question on my last reply or did I miss the point?
>
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM]On Behalf
> Of Bernard Lebel
> Sent: Wednesday, October 18, 2006 3:11 PM
> To: XSI(at)Softimage.COM
> Subject: Re: [script] Normals - not understanding
>
>
> I should add that the actual null rotation values correspond to the
> normal values. However, the normal values are, from what I see, very
> strange. For instance, to match a normal of a certain vertex of values
> 40.0, 0.0, 40.0, I would have to use a rotation value of 0.0, 45.0, 0.
>
>
> Bernard
>
>
>
> On 10/18/06, Bernard Lebel <3dbernard(at)gmail.com> wrote:
> > Hi,
> >
> > I'm writing a script that extracts the normal vector of every point of
> > a mesh. Then these vectors are mapped to world space. Finally, for
> > each point, a null is created and the world vector is applied to its
> > rotation.
> >
> > For a minority of normals, it works well, the null ends up with the
> > right orientation. But for a majority of them, the null has an
> > orientation that I have a hard time to figure out.
> >
> > If you create a sphere and run the code below, you'll see what I mean:
> >
> >
> > import win32com
> >
> > xsi = Application
> > xsimath = win32com.client.Dispatch( 'XSI.Math' )
> >
> > oMesh = xsi.selection(0)
> > oMeshTransform = oMesh.kinematics.local.transform
> >
> > for oPoint in oMesh.activeprimitive.geometry.points:
> >
> >         # Get global point normal direction
> >         ovGlobalNormal = xsimath.mapobjectorientationtoworldspace(
> > oMeshTransform, oPoint.normal )
> >
> >         # Get New point position
> >         ovGlobalPosition = xsimath.mapobjectpositiontoworldspace(
> > oMeshTransform, oPoint.position )
> >
> >         # create null
> >         oNull = xsi.activesceneroot.addnull()
> >
> >         oNull.kinematics.local.rotx.value = xsimath.radianstodegrees(
> > ovGlobalNormal.x )
> >         oNull.kinematics.local.roty.value = xsimath.radianstodegrees(
> > ovGlobalNormal.y )
> >         oNull.kinematics.local.rotz.value = xsimath.radianstodegrees(
> > ovGlobalNormal.z )
> >
> >         oNull.kinematics.local.posx.value = ovGlobalPosition.x
> >         oNull.kinematics.local.posy.value = ovGlobalPosition.y
> >         oNull.kinematics.local.posz.value = ovGlobalPosition.z
> >
> >
> >
> > Any idea?
> >
> >
> > Using XSI 5.11
> >
> >
> > Thanks
> > Bernard
> >
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