Updates on Visualization - CERN Indico
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
Updates on Visualizatio
Laurent Garnier. IRIS
Guy Barrand IJCLa
John Allison G4A
Frederick Jones TRIUM
Stewart Boogert. Royal Hollowa
Laurie Nevay. Royal Hollowa
Laurent Garnier - CNRS
Geant4 Virtual Meeting - 24 Septembre 202 1
A
I
1
b
F
y
y
n
1
11.0 Release status
● All drivers:
● New commands
● /vis/viewer/set/specialMeshRendering
● This should come before /vis/drawVolume
● /vis/viewer/set/specialMeshVolume
● To select meshes if necessary.
● Small change of behaviour if a user opens a second viewer. It now picks up the
view paramaters of the most recent previous viewer.
● New example/extended/visualization/movies.
● Removal of obsolete drivers (thanks to Ben)
● New ToolsSG drivers.
● VTK driver updates
● OpenInventor updates
● TOOLSG updates
Laurent Garnier - CNRS
Geant4 Virtual Meeting - 23 Septembre 2021
VTK visualisation driver (2) Stewart Boogert
Laurie Nevay
@Royal Holloway
• Example in action • Stretch example (CMS)
(extended/medical/DICOM • Large GDML file (from JA)
example) • Slow to interactively view in
GL and Open Inventor
• Usable performance on
laptop
• Performance scales with GPU
Need to implement “special” mesh rendering
for nested PVs
VTK visualisation driver (3) Stewart Boogert
Laurie Nevay
@Royal Holloway
• Interactive 3D in PowerPoint! Vtk → OBJ/GLTF → Powerpoint
This is not a movie but the actual 3D model. Download the PowerPoint and manipulate (rotate, zoom etc.)
CGAL Boolean engine Stewart Boogert
Laurie Nevay
@Royal Holloway
https://www.cgal.org
• Processing using • Benefits of CGAL
Computational Geometry • Very robust algorithms
Algorithms Library (CGAL) • Manipulate tessellated data
• Open source and header only within G4
library (+ boost headers) • tetrahedralization
• So can be packaged with G4 if • detect non-manifoldness,
required uniform remeshing, Delaunay
• Replace algorithms in
• G4Polyhedron &
G4PolyhedronArbitary
• G4(Union,Subtraction,Intersecti
on)Solid
• G4MultiUnion
• Question about thread safety
• Use G4RecursiveAutoLock
Union of 250 random (size and orientation) cubes
Open Inventor Qt Viewer Frederick Jones, TRIUMF
The new Qt-based viewer (OIQt) is complete with all the required feature
• Meets or exceeds the functionality of the older OIX and OIXE viewer
• Removes the dependency on obsolescent Xt and Xm (Motif) librarie
• Requirements are: Qt5, OpenGL, and Coin3d libraries. On MacOS the native OpenGL
can be used and no X11 or Mesa libraries (XQuartz) are required
• Available to try in 11.0 Beta; some minor additions are being done for Release 11
• The Coin3d libraries (Coin 4.0.0 and SoQt 1.6.0) can be installed system-wide via a
package manager (Linux) or brew (MacOS). They can also be built from source by
cloning repositories from https://coin3d.github.io/ and following the build instructions.
What is this viewer useful for
• Bookmarking: similarly to a web browser, any 3d view can be
“bookmarked” and revisited later with a single mouse-click.
• Changing views consists of just changing the camera
settings, so the viewer remains fully functional at all times
• Bookmarks are shown in a clickable editable list and are
stored in a file for use in later runs. When developing a
geometry or debugging a simulation, it is easy to return to
view specific parts of the detector and nearby particle
trajectories
• Cycling through the bookmarks results in a “slide show”
where each slide is fully 3d-interactive – useful for
presentations using screen sharing.
6
Geant4 Collaboration Meeting 20-24 September 2021
.
?
.
.
s
s
.
sOpen Inventor Qt Viewer Frederick Jones, TRIUMF
What is this viewer useful for …(continued
• Fast and precise navigation: moving the camera along a “reference path”
• A reference path is defined as a selected particle trajectory or generally as a list of
3d coordinate triples, loadable from a file
• Geometry elements are ordered according to their perpendicular distance from the
path (most useful for extended structures such as beam lines) and are displayed in
a clickable list for quick navigation to any element
• Buttons for stepping through the elements and for 90-degree rotations around the
reference path. “Flyover” animation feature moves the camera smoothly along the
path, with speed and elevation controls
• Other: seek function to re-center the view on any geometry element; mouse-over
readout of volumes and trajectories; PS and PDF output (the latter with transparency).
The viewer can be hosted in the Qt UI panel (as with the OGL viewer), or detached as a
self-contained viewer in a resizable window (e.g. for full-screen use in a second monitor).
Remarks and plans
• The transition to Qt allows reduced 3rd party library dependencies, especially on MacOS,
and should make it easier for users to access this viewer.
• A Qt-based viewer allows easy integration into the Qt UI, with unified event management
of mouse and keyboard input. The way is open for further development.
• Plans
• Application support for reference path definition and other navigation modes
• Investigate packaging of Coin3d libraries for ease of access by users
• Promote the use of different easily-switchable viewers in the G4 Examples.
7
Geant4 Collaboration Meeting 20-24 September 2021
:
.
.
)
.
.
.G4/vis/ToolsSG
• Have the G4/vis “ToolsSG” vis drivers based on the g4tools/
sg “scene graph” logic (similar to the “So” one of Inventor).
• Rendering of a scene graph is abstracted. Have concrete
renderer for OpenGL, but also for “offscreen” by using gl2ps.
• Good part of the code is already here in g4tools because of
offscreen plotting.
• In G4-11, have code in g4tools to tie to “windowing systems”
as straight X11, Windows but also for OpenMotif and Qt.
• Arrange to have in G4/vis/ToolsSG itself, only the code
needed to tie to the G4/vis logic.
• Still push, as much as possible, an “academic way” in G4/vis.
G.Barrand, CNRS/IN2P3/IJCLABToolsSG/Qt/OpenGL driver on B1
G.Barrand, CNRS/IN2P3/IJCLABWebAssembly
An interesting technology to have on the web a C++
application, that does WebGL for its graphics, and this
without having to deploy a specific web server.
Guy Barrand, CNRS/IN2P3/IJCLab 2Physics: Geant4, HEP
• I ported g4view, g4exa: and then have Geant4 (10.3) in .wasm!
• I can read .root files with geometries, histos and ntuples.
• pmx is ok: then an embryo of LHCb event display (to show, again and
again, that we can do highly portable C++ HEP apps without having
to embark… the rest of the world).
• EsbRootView: R&D display for ESSnuSB (ESS is an accelerator at
Lund). Presented at vCHEP-2021 in May. There is now a paper.
• I have a terminal mode (done with xterm.js) to type “insh”
commands, or… G4 commands, then from the web browser!
• All these are testable from gbarrand.github.io, under the sections
« WebAssembly » of each apps.
Guy Barrand, CNRS/IN2P3/IJCLab 9g4view Guy Barrand, CNRS/IN2P3/IJCLab 11
Questions ? Laurent Garnier - CNRS Geant4 Virtual Meeting - 23 Septembre 2021
You can also read
