DIRECTORY G3dBasic, G3dRender, IO, Rope, ViewerTools;G3dScene: CEDAR DEFINITIONS~ BEGINROPE:			TYPE ~ Rope.ROPE;STREAM:		TYPE ~ IO.STREAM;Context:		TYPE ~ G3dRender.Context;SelPos:		TYPE ~ ViewerTools.SelPos;Viewer:		TYPE ~ ViewerTools.Viewer;LogProc:		TYPE ~ PROC [rope: ROPE];WriteCameraParameters: PROC [context: Context];WriteParameters: PROC [context: Context, fileName: ROPE _ NIL];WriteParametersToStream: PROC [context: Context, out: STREAM];MakeFrameFromFile: PROC [context: Context, fileName: ROPE];ReadParameters: PROC [context: Context, fileName: ROPE _ NIL, cmdOut: STREAM _ NIL]RETURNS [shouldRepaint: BOOL];ParseError: ERROR [position: NAT, fileName: ROPE, viewer: Viewer];ViewerSelection: TYPE ~ RECORD [viewer: Viewer, selection: SelPos];Parse: PROC [context: Context,operation: ROPE,cmdOut: STREAM _ NIL,log: LogProc _ NIL,showErrors: BOOL _ TRUE,fileName: ROPE _ NIL,viewerSelection: ViewerSelection _ [NIL, NIL]]RETURNS [shouldRepaint: BOOL];END.  .  G3dScene.mesaCopyright c 1988 by Xerox Corporation.  All rights reserved.Bloomenthal, February 19, 1989 1:07:59 pm PSTType Declarations;Write Scene Descriptions to a File or ViewerWrite the camera parameters to the primary selection.Write all the relevant parameters of the context to the specified file.If fileName = NIL, obtain it from the current mouse selection.If fileName = NIL and no fileName selected by the mouse, write to the primary selection.Write all the relevant parameters of the context to the output stream.Read Scene Descriptions from a File or ViewerDisplay a scene described in fileName; leave context unchanged.Read the image tool parameters.If fileName = NIL, obtain it from the current mouse selection.If fileName = NIL and no fileName selected by the mouse, read from the primary selection.Parsing the Scene DescriptionReturn character position of error within the file or viewer, whichever is non-NIL.Perform the specified operation on the context.operation consists of an arbitrary number of operations:each operation is a keyword followed by arguments, if required.fileName is the file, if any, from which the operation was read;if it is non-NIL and showErrors is TRUE, it is used to indicate the location of errors.viewerSelection is the viewer and selection, if any, from which the operation was selected;if they are non-NIL and showErrors is TRUE, it is used to indicate the location of errors.See the graphics 3d documentation for a list of operations.If log is non-NIL, a message is sent for each operation parsed. Ê±  ˜ ™Jšœ
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