Import Geant4 8.0.0 source tree
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Gabriele Cosmo
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$Id: History,v 1.46 2005/05/29 23:18:56 allison Exp $
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$Id: History,v 1.59 2005/11/24 10:24:12 allison Exp $
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-------------------------------------------------------------------
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=========================================================
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@@ -20,6 +20,95 @@ committal in the CVS repository !
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History file for visualization/OpenGL
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-------------------------------------
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24th November 2005 John Allison (opengl-V07-01-09)
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- Protected G4OpenGLXmViewerMessenger with #ifdef G4VIS_BUILD_OPENGLXM_DRIVER.
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22nd November 2005 John Allison (opengl-V07-01-08)
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- Added G4OpenGLXmViewerMessenger.
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- Corrected text position.
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- Made depth test for polyhedron GL_LEQUAL (slightly dominant).
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17th November 2005 Gabriele Cosmo
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- Fixed settings of background style for WIN32 viewers.
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13th November 2005 John Allison (opengl-V07-01-07)
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- Implemented X-Window-style geometry hints in G4OpenGLXViewer.
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13th October 2005 John Allison (opengl-V07-01-06)
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- Allowed any colour background.
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- Implemented non-uniform scaling.
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- Migration to <sstream>.
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29th September 2005 John Allison (opengl-V07-01-05)
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- Added G4OpenGLViewerDataStore to facilitate access of viewer data by
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scene handler.
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- Re-implemented transparency button in OpenGLXm.
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13th September 2005 John Allison (opengl-V07-01-04 - needs visman-V07-01-02)
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- Implemented white background for all OGL viewers.
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- G4OpenGLSceneHandler.cc:
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o Fixed hidden line removal (bug introduced in opengl-V07-01-02).
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o Fixed treatment of triangular polygons for drawing of auxiliary/soft lines.
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o Corrected GetTextColour(text).
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o Corrected GetColour(polyhedron).
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5th September 2005 John Allison (opengl-V07-01-03)
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- Bug fix: stored transparent objects were being lost.
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2nd September 2005 John Allison (opengl-V07-01-02 - needs visman-V07-01-01)
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- Bug fix: edgeflags problem introduced with smooth shading in
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opengl-V07-01-00.
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- Implementation of a "better algorithm" for the rendering of
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transparent polyhedron objects. It renders all opaque objects
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first, then renders the transparent objects with the depth buffer in
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read-only mode (see OpenGL Programming Guide). It uses the new
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facility in G4VSceneHandler::ProcessScene for an optional second pass
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of the run-duration models in the scene. Note this algorithm is
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still only an approximation. It will still give the wrong blended
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colour if two transparent objects are rendered front first. For
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nested transparent objects, this is unfortunate, because
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G4PhysicalVolumeModel traverses Geant4's mother-daughter hierarchy
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in such a way that mothers come first. Also, there is no guaranteed
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relationship between the order of rendering and the depth of two
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transparent objects if they are at the same level or in different
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branches of the hierarchy. Still, the only error will be an
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incorrect colour - the objects will still give the appearance of
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transparency, so it's a pretty good algorithm. (An even better
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algorithm would be to attempt to render the facets in depth order,
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deepest first. But how do you calculate the depth - centre of area,
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deepest corner? One can still imagine pathalogical cases that would
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sometimes give the wrong colour. Also, for stored mode, the order
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is fixed in a display list so when the user rotates the view, one
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would lose the depth ordering. I think we have to accept that
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blending in OpenGL is only ever an approximation. For accurate
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blending, use RayTracer.)
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28th August 2005 John Allison (opengl-V07-01-01)
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- Half-way implementation of rendering of transparent polyhedron
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objects. In this implementation, no account is taken of the order
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of rendering. Transparent objects are rendered with depth testing
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off so that objects behind can still be seen. But this means that
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opaque objects in front do not obscure them - and they jolly well
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should! A better algorithm is to render all opaque objects first,
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then render the transparent objects with the depth buffer in
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read-only mode (see OpenGL Programming Guide). This is going to
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take a little more thought - see opengl-V07-01-02.
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20th July 2005 John Allison (opengl-V07-01-00)
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- Introduced smooth shading, taking advantage of hitherto un-noticed
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feature of HepPolyhedron::GetNextFacet that calculates the normals
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at each vertex so that curved surfaces are rendered more
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realistically (Gouraud shading).
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- G4OpenGLImmediateSceneHandler.cc: Removed unnecessary #include's.
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- G4OpenGLXmViewer.cc: Fixed to use window size hints. This changes
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the default window size. It used to be 400x400, hardcoded in
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G4OpenGLXmViewer.cc, but now it picks up the
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G4ViewParameters::GetWindowSizeHintX/Y, which defaults to 600x600.
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The user may change it on the command line, e.g:
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/vis/open OGLSXm 500
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or
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/vis/viewer/create ! ! 500
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30th May 2005 John Allison (opengl-V07-00-03)
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- Fixed compilation problem in OpenGL on SUN. (Replaced multimap by
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map of vectors in G4OpenGLFontBaseStore.)
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