Hi, in ArcScene you can use scenegraph.Locate to convert you mouse coordinates to map coordinates, but for my situation it works only for existing features in Scene. I make add-in tool that create point by clicking mouse, and if i click on empty space of scene it return error like "the operation attempted on empty geometry", if i click any geometry objects (put my point on polygon or line) it works properly... ISceneGraph pSG = scene.SceneGraph; esriScenePickMode nMode = new esriScenePickMode(); object pOwner = new object(); object pObject = new object(); pSG.Locate(pViewer, X, Y, nMode, true, out pPntReturn, out pOwner, out pObject);
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