Hi Steven, Why don't you keep a dirty flag for the pickbuffer and simply set that in Activate and then the next time you ask for the pickbuffer (in mouse move or mouse down) recompute it if it is dirty.
The pickbuffer is specific to a particular view so you can't generate it is a callback like Activate which is not tied to any particular view. The same holds for methods like GetMousePosition. It will return CStatus::Fail when called from Activate. I guess we should have added an IsValid method to the pickbuffer but as a workaround you can assume that if GetViewIndex returns a value greater or equal to zero then it is safe to call GetPickBuffer. You will also need to decide if you are going to cache a pickbuffer for each view or just keep one for the last view etc... The pickbuffer stuff was designed with this purpose in mind and one of our consulting devs used it to do a real-time (GAP-like) sculpting tool for a client. -- Brent From: softimage-boun...@listproc.autodesk.com [mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Steven Caron Sent: 30 July 2012 04:43 To: softimage@listproc.autodesk.com Subject: SDK : caching the tool context pick buffer hey guys... (read brent) i am trying to cache the PickBuffer each time the user activates this custom tool (this happens on camera navigation, which is my primary concern) but not having much luck. the doc suggests if i pass an empty region i will get the whole view but any subsequent calls i am making to PickBuffer.GetObjectAtPosition() has returned an invalid reference. is this doable in the Activate calback? the docs say..."if unavailable in the current callback or any arguments are invalid then the resulting PickBuffer will be invalid." so, are my arguments incorrect or is this not valid in the this callback? // activate callback, called each time the tool comes active again CStatus Activate(ToolContext& in_ctxt) { // get a list of selected meshes const CString empty; CStringArray families; families.Add(siMeshFamily); Application().GetSelection().GetArray().Filter(empty, families, empty, m_targets); // cache a pick buffer, m_pBuffer is a class member variable where i am caching it m_pBuffer = in_ctxt.GetPickBuffer(x, y, width, height, siPolygonFilter, m_targets, siShaded); LONG x,y; in_ctxt.GetMousePosition(x, y); CRef l_obj = m_pBuffer.GetObjectAtPosition(x, y); Application().LogMessage(L"Activate : " + l_obj.GetAsText()); return CStatus::OK; }; any other tips on caching the PickBuffer each time the camera changes? steven
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