Sounds like it might work.
Did you run the scripts? You will see what the curve does... If your
suggestion does exactly the same thing then you're correct. :)
*written with my thumbs
On Jan 15, 2016 3:05 AM, <pete...@skynet.be> wrote:
> if I read this correctly – you’re just doing position – not orientation
> right?
>
> it works in ICE like this:
>
> for a null path constrained on curve.
> make an identical copy (null1 on curve1)
>
> [( null global pos – curve global pos ) multiply by –1 ] >> translation
> port of an SRT to Matrix >> set curve1 global transform
>
> null1 stays put at the origin...
>
> I’m probably oversimplifying things?
> *From:* Steven Caron <car...@gmail.com>
> *Sent:* Thursday, January 14, 2016 8:56 PM
> *To:* softimage@listproc.autodesk.com
> *Subject:* Re: Object motion converted to path animation but normalized
> atorigin?
>
> For those interested in following...
>
> here is two scripts, one to set up the scene so you can see the scenario
> to start, and then another to normalize the motion per David's simpler
> method.
>
> #python
> #setup example scene
> Application.SICreateCurve("crvlist", 3, 0)
> Application.SIAddPointOnCurveAtEnd("crvlist", 486.895161434139,
> 325.493002786473, 34.5570511051906, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 409.033597647559,
> 271.688103800014, 29.5535480810531, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 85.4440658602002,
> 300.987801267806, -66.6103573229066, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", -246.20762156975,
> 272.753547344553, -147.807009721528, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", -497.571600133753,
> 131.0495559517, -173.495355859157, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", -456.369852362362,
> -4.26177417487577, -122.038908353107, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", -81.571345301959,
> 14.3834878497712, -26.3265899671214, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 233.227806621437,
> 145.965765570476, 19.5179940313196, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 553.247813449155,
> 111.871572155872, 116.146231591289, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 537.167802185775,
> -116.666068097906, 179.907658216995, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 228.873883716215,
> -268.49177316504, 141.853471471277, False, 0, "")
> Application.SIAddPointOnCurveAtEnd("crvlist", 124.433876714773,
> -305.782297213815, 124.747175301071, False, 0, "")
> Application.CreatePrim("Cone", "MeshSurface", "", "")
> Application.SetValue("cone.cone.radius", 3, "")
> Application.SetValue("cone.cone.height", 12, "")
> Application.ApplyCns("Path", "cone", "crvlist", "")
> Application.SaveKey("cone.kine.pathcns.perc", 1, "", "", "", "", "")
> Application.SetValue("PlayControl.Current", 100, "")
> Application.SetValue("PlayControl.Key", 100, "")
> Application.SetValue("cone.kine.pathcns.perc", 100, "")
> Application.SaveKey("cone.kine.pathcns.perc", 100, "", "", "", "", "")
> Application.SetValue("cone.kine.pathcns.tangent", True, "")
> Application.SetValue("cone.kine.pathcns.dirx", 0, "")
> Application.SetValue("cone.kine.pathcns.diry", 0, "")
> Application.SetValue("cone.kine.pathcns.dirz", 1, "")
> Application.SetValue("cone.kine.pathcns.dirx", 0, "")
> Application.SetValue("cone.kine.pathcns.diry", 1, "")
> Application.SetValue("cone.kine.pathcns.dirz", 0, "")
> Application.SetValue("cone.kine.pathcns.upvct_active", True, "")
>
> #python
> #normalize and invert motion of path cns
> Application.GetPrim("Null", "", "", "")
> Application.SetValue("null.Name", "parent", "")
> Application.Duplicate("parent", "", 2, 1, 1, 0, 0, 1, 0, 1, "", "", "",
> "", "", "", "", "", "", "", 0)
> Application.SetValue("parent1.Name", "child", "")
> Application.CopyPaste("child", "", "parent", 1)
> Application.SelectObj("parent", "", "")
> Application.ApplyCns("Position", "parent", "cone", "")
> Application.SelectObj("child", "", "")
> Application.ApplyCns("Position", "child", "crvlist", "")
> Application.PlotConstrainedTransformsToActions("child", "plot", 1, 100, 1,
> 20, 3, False, 0.01, True, True, True, True, True)
> Application.SelectObj("parent,child", "", "")
> Application.RemoveAllCns("", "")
> Application.SelectObj("crvlist", "", True)
> Application.ApplyCns("Position", "crvlist", "child", "")
> Application.SelectObj("parent", "", "")
> Application.ResetTransform("", "siObj", "siTrn", "siXYZ")
>
>
> On Thu, Jan 14, 2016 at 11:48 AM, Steven Caron <car...@gmail.com> wrote:
>
>> Not really, I have it working how I want now, I had come up with my own
>> way but also David Barosin on the SItoA list (I accidentally posted there)
>> gave me a simpler answer. Here is David's response...
>>
>>
>>> If the plane is on a curve, a hierarchy of 2 nulls could do it.
>>> The parent null is constrained to the plane. The child null is
>>> constrained to the curve. Plot the child null's position.
>>> Remove the constraints from both nulls.
>>> Now constrain the curve to the child null and zero out the parent null's
>>> SRT.
>>> Hope that makes sense.
>>
>>
>>
>>
>
