I don't know if this is the same problem we ran into many years ago, but it goes something like this:
To the best as I could figure out, the problem mostly appears when you have defined more than one RGBA color parameter (4 parameters of type siFloat) into a RGBA color widget. Any parameters defined in the custom property after that point will not respond to multi-selection behaviors. My workaround was to put the color parameters last in the custom property's _Definition() callback.
The 2nd part of the workaround is how you read parameters inside of a callback. Softimage does have a few bugs here or there that I found many years ago and reported, but as far as I could tell they were fixed in 2012 SP1. Anyway, how you pull parameters inside the callback is important.
Example: The typical syntax to get access to a custom property and it's parameters from inside an _OnClicked() or _OnChanged() parameter callback is something like this (Jscript):
var oCustomProperty = PPG.Inspected.Item(0);
var oParameters = oCustomProperty.Parameters;
var ParameterValue = oParameters( "parametername" ).value;
The key part of the whole equation is the first line. In this example it pulls the first custom property in the inspected list. If you want to consider all custom properties being inspected, you must iterate through the InspectItems collection and treat them one at a time.
From: softimage-boun...@listproc.autodesk.com [mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Bradley Gabe
Sent: Thursday, May 10, 2012 12:03 PM
Subject: Custom PPG's do not work with Multi Selection?
I've noticed this before, and now it's happening with a custom tool kit I've been developing.
I have a simple Custom PPG defined in a self installing plugin and am applying it to multiple objects in the scene. However, if I multi-select the objects, the PPG doesn't show up at the top of the selection explorer.
If I open the PPG on one of the objects, then multi select other objects with the same custom property, the title bar of the PPG reads "[multi]", but none of the multi selection features work... if I edit a parameter, it only affects the first item in the selection.
What gives? Is there a way to construct the PPG in order to avoid this behavior? I really need them to work in multi-selection mode!