hey nice tips Matt, thanks for the detailed explanation. I'll look into the GridData object on the next time.
cheers. 2016-12-14 2:33 GMT-02:00 Matt Lind <[email protected]>: > I always cringe when I see the SafeArray suggestion as it doesn't tell the > whole story. > > I haven't tried this for ICE attributes, but for all other things JScript > requiring the use of an array, you can use the GridData object from the > Softimage SDK. It's a lot more convenient than dabbling with the esoteric > SafeArray object and is fully supported by the Softimage SDK avoiding the > workarounds for certain commands and methods. The GridData object is smart > enough to automatically resize itself when ingesting data from a known > source (for multi-dimensional arrays): > > var oObject = Selection(0); > var oGridData = XSIFactory.CreateGridData(); > oGridData.Data = oObject.ActivePrimitive.Geometry.Vertices.PositionArray; > > LogMessage( "Grid[rows,cols]: " + oGridData.RowCount + ", " + > oGridData.ColumnCount, siComment ); > > > The Grid doesn’t auto-resize for all array types, but it supports most > you’ll > encounter such as cluster data (envelopes, materials, user normals, vertex > colors, texture UVWs, ...). to write the data to another property, just > assign the .Data property in reverse of what is shown above. > > oCluster.Elements.Array = oGridData.Data; > > Anyway, writing the data to the ICE Attribute does work, but as you found > out you must freeze the modeling history of the ICE Attribute property > because technically (I think) it’s an operator. That implies it has an > internal update callback which will get triggered after any attempt you > make > to modify the data. You make a change, then the update callback is > triggered recomputing and applying the original data you overwrote. > Freezing the operator converts it to static data which you can then modify > with script. > > As for purely JScript issues with arrays, you only need to convert to a > safeArray when you need to modify array data and send it back into > Softimage. If you’re just reading data, or modifying it locally with no > intention of sending it back where it came from, you don’t have to convert. > that’ll save overhead in the runtime of your code. > > Another shortcut is the use of the .Array() method to convert the data to > safeArray to make it more concise and easier to read in code. For example: > > // Get envelope weights and convert from safeArray to JScript array in the > process > var aEnvelopeWeights = ( oEnvelope.weights.Array ).toArray(); > > // Get vertex colors on mesh located nearest specified set of position > coordinates > var oPointLocators = oPolygonMesh.GetClosestLocations( aPositions ); > aVertexColors = oPolygonMesh.EvaluateClusterProperty( oPointLocators, > oParentCluster, oClusterProperty ).toArray(); > > Just enclose the quantity to be converted in parentheses, then append > .Array() to the right parenthesis. the only caveat is to make sure the > quantity to be converted is not null or else it’ll throw an error. > > Matt > > > > > > Date: Tue, 13 Dec 2016 20:34:02 -0200 > From: Fabricio Chamon <[email protected]> > Subject: Setting ICE attribute DataArray in javascript > To: "[email protected]" > <[email protected]> > > Hey, > > lots of questions these days, sorry. > > So I'm searching all day through the list and internet to find a solution > for this... I'm trying to set per polygon ice attribute values on a mesh > via sdk (javascript). > The subject was already discussed, Stephen Blair have some studies on it, > one solution was given but in the end I'm still not able to get it working. > > So here's roughly my code: > > var ICEAttr = highResGeo.AddICEAttribute("rbdId", siICENodeDataLong, > siICENodeStructureSingle, siICENodeContextComponent2D ); > var myDataArray = new Array(); > var faces = highResGeo.Facets; > for (i=0;i<faces.count;i++){ > var face = faces(i); > myDataArray[i] = parseInt(x); //does not matter, assume any value for x > } > > //now here's the tricky part > > da1 = getSafeArray(myDataArray); > da2 = getSafeArray([myDataArray]); > ICEAttr.DataArray = da2; > > > //helper function > function getSafeArray(jsArr) { > var dict = new ActiveXObject("Scripting.Dictionary"); > for (var i = 0; i < jsArr.length; i++) > dict.add(i, jsArr[i]); > return dict.Items(); > } > > > > > This SafeArray stuff is the solution proposed by Stephen on his blog...but > gives me : > > *WARNING : 3392 - Invalid offset specified while extracting data from this > attribute: <Attribute: rbdId>* > *// <Offset: -1>* > > Any hints on what I'm doing wrong ?? > > Thanks! > > > ------ > Softimage Mailing List. > To unsubscribe, send a mail to [email protected] > with "unsubscribe" in the subject, and reply to confirm.
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