Geant4 Geometry in Collada

• DAE TOOLS
• Planning Geant4 Collada Exporter
  • About Collada
  • Geant4 docs
  • How to implement ?
  • Triangulate the output geometry ?
  • Collada Double Sided Faces
    • Sketchup DAE exporter
  • XML format
  • CADMesh : From CAD files into Geant4 G4TessellatedSolid
• XMLDAE : raw G4DAE node structure
  • Questions
    • Reversible Char Swaps
  • Raw Node Tree
  • Compare daenames with wrlnames : tracing the id
• PyCOLLADA Internals
  • XML parsing into IndexLists
  • collada._loadNodes
    • scene.loadNode
    • Node.load
  • Binding objects to a list of transforms
    • SceneNodes
• PyCOLLADA Triangulation
• WRL Crosscheck : reveals mangled vertex coordinates
• Vertex Coordinate Debug : finding the invertex rotation matrix
  • Coordinate Systems
    • Collada
    • Geant4
    • GDML
    • VRML2
  • GDML Geometry Trace
  • Debug PV1 near_rock vertices
    • pycollada Access
    • PV0 WorldBox
    • PV1 near_rock untransformed
    • PV1 near_rock transformation
    • PV1 primitives
    • Unsuccessfull diddling
    • reconcile PV1 vertices, VRML2 cf pycollada
    • PV1 VRML2 coordinates
  • Transformation Implementations
    • PyCollada Transformation Inconsistency
    • PyCollada Primitive Fix
    • G4DAEWriteStructure::MatrixWrite
    • G4GDMLReadStructure::PhysvolRead rotation inverted ?
    • G4Transform3D::G4Transform3D
    • PyCollada Recursive Transformations
    • Geant4 Transform handling
• DAE cf WRL
  • Questions
  • Answered Questions
  • Create DAE DB
  • Attaching two DB in sqlite3
  • Consistent Volume counts
  • Volume index join between WRL and DAE tables in separate DB
  • Vertex Count Discrepancy for 1688/12230 volumes (14 %)
    • With first generation DAE makes no difference
  • Discrepancies grouped by geometry id
  • Caution System SQLite3 is glacial on N
  • Check GDML
  • Visual check of discrepants : lots of interesting shapes
  • Same process DAE then WRL : vertex counts match
  • Same process WRL then DAE : vertex counts match
  • Built Meshlab in order to read DAE and WRL
  • Nov 18 2013 : Same Process export : WRL then DAE
    • WRL coordinate roundings again
    • OOPS : FIX IS ON CMS02 BUT NOT BELLE7
    • max squared offset per volume, before VRML mm rounding fix
  • Nov 18 2013 : Same Process export : DAE then WRL
  • Nov 19 : recompile N Geant4 with patched VRML2
  • Nov 19 : Move Matrix fix from pycollada monkey patch to G4DAEWrite
  • DAE WRL comparison with invrot done in DAE writing
  • DAE Viz
  • Face Check
  • Investigate DAE/WRL code path differences
  • Polysmry for debug
  • Always Create Polyhedron
  • [Dec 3, 2013] Back to Face checking after MeshLab Visualisation Interlude
  • With Poly reuse : quick polysmry is matching
  • With poly reuse
  • DGV_20131204-1746 : after removing all extra poly creation
  • VGD_20131204-1806 : VRML first
  • Crossed Order Comparison
• DAE cf WRL at code level
  • Compare G4DAE and VRML2 geometry handling code
  • BooleanProcessor
  • G4Polyhedron::SetNumberOfRotationSteps ?
  • Geant4
• Collada To Chroma
  • Initial Shakedown
• g4daeview
  • DAEVIEW FUNCTIONS
    • DEPENDENCIES
      • Delta : OSX 10.9.2 chroma virtualenv python, based off macports py27
      • G4PB : OSX 10.5.8 macports py26
  • G4DAE and G4DAEVIEW Development History
  • g4daeview.py
    • Usage Tips
    • Usage text
    • Event Loading/slicing tips
    • Receive ChromaPhotonList from Remote Geant4
    • Load/Save ChromaPhotonList
    • Screen Captures and apache publishing
    • Grab Screen Captures including GLUT menus
    • Partial geometry
    • Target Mode
      • interactive target selection
    • near/far clipping controls
      • ISSUES
    • solid picking
      • TODO
    • placemarks
    • markers
    • Viewpoint Bookmarks
      • ISSUES
    • Animation
      • interpolate between bookmarks
      • orbiting mode
      • animation control
      • photon propagation time control : interactive and auto scanning
    • remote control
    • raycast launch control
      • interactive switch to metric pixels presentation
    • screen capture
    • movie capture
    • Parallel/Orthographic projection
    • Presentation
  • G4DAEView Chroma
    • Single PMT Test
    • A Few PMTs and radial shield
  • g4daeview debugging
    • Tricks to work out whats gone wrong
    • Issue
    • Near behaving like far
    • Removing the scale kludge
    • Targetting outer volumes draw blanks
    • Near
    • Light control
    • Unproject
    • Trackball
    • Remote Control
    • Modes of operation
      • scaled mode
      • target mode
    • Scenarios
      • detail view
      • outside view
    • Lighting
  • G4DAEVIEW Lights
    • reference
    • Light Positioning
      • Controlling a Light’s Position and Direction
    • Understanding Lights
    • glumpy lights
    • refs
  • Daeview Dev Notes
    • Limitations
      • GPU Out-of-memory during BVH construction with full Juno geometry (50M nodes?)
    • Old Issues To Be Revisited
      • More Bizarrness
      • Animation
    • Reflectors
      • Bizarre
      • Interpolation
      • Interpolation Jumps (FIXED)
  • DAEVertexBuffer Dev Notes
    • Interop
      • Too Many Moving parts
      • AoS or SoA
      • Data flow
      • What needs to be shared between CUDA and OpenGL ?
      • Single VBO approach (array-of-structs)
      • NVIDIA Example
      • Targetted googling
        • andyswarm
      • Separate VBO approach (struct-of-arrays)
      • glBindBuffer
    • OpenGL Drawing Techniques
      • glDrawElements
      • glDrawElements offset
      • glPushClientAttrib
      • glMultiDrawElements
    • Read OpenGL buffer back into numpy arrays
  • DAEPhotonsShader
  • OpenGL Shader Language
    • GLSL 120
    • GLSL 120 Extensions
      • GL_EXT_gpu_shader4
      • GL_EXT_geometry_shader4
      • glVertexAttribIPointer API hunt
      • GL_NV_vertex_program4
    • Fixed Pipeline and Shaders
    • Bitwise operations glsl
    • line strip finnicky
    • shaders and integers dont mix in version 120
  • Photon Level Debug
    • Issues
      • spagetti style and surface step selection incompatible
      • Pushing Up the Slots causes BUS error (AVOIDED)
      • Single Photon Debug
      • Photon Picking
      • Make Bialkali absorb rate ?
      • Quite a lot of many step histories
      • Visual distinction for zombie photons
      • Difficult to zoom into closeups
      • Photon Appearance
      • ESR Step start Asymmetry
      • Material Step Starts
      • Discrepancy between presentation modes (FIXED)
      • Material Selection not compatible with Spagetti style
      • Timeconstant for reemitted photons ?
      • Infinite wavelength for reemitted photons (FIXED)
      • Disappearing/Reappearing Photon 3126 : FIXED
      • Missing NO_HIT : FIXED
      • Dropouts : 91 long bouncers out of 4165
    • Fixed Issues
    • Repeatability/Seeding Doubts
    • Techniques
      • daephotonsanalyzer.sh
      • truncation
      • debugphoton
      • history selection
      • Restrict to photons with n-step histories
      • Restrict birth time range, allowing to examine cohorts
      • cohort mode, third value in cohort string
      • photon highlighting
      • style playoff
  • Material Pair Debug
    • Thoughts on how to proceed
    • Geant4 step level comparison
    • Machinery
    • DAEPhotonsAnalyzer.get_material_pairs
      • Both end material check
      • Implement step selection based in from and to materials
      • Broken chain
    • Examine the big hitters
      • Observations
    • Long lived
  • Propagated Flags Mismatch
  • G4DAEView Performance
    • Pushing to max-slots 100 bogs down performance
    • Apple OpenGL Profiler
    • LINE_STRIP slow performance report
  • Optical Photon Marshalling
    • Overview/Issues
    • Numpy Serialize into buffer ?
    • Efficient Selection of Numpy array, eg just the hits with PMTID > 0
    • Current lifecycle of optical photon data
    • Photon Data
    • Using C++ placement new for dummy OP ?
    • Alternate Serialization/Compression to ROOT TObject
  • Propagate Timeouts
    • Objectives
    • mock001 : normal incidence NAN_ABORT
    • mock001 : axis aligned photons issue
    • Code Improvements
    • Dependencies
    • DONE
    • Issues
      • timeouts
    • mock photons
    • vbo vs non-vbo hit count difference
    • mocknuwa propagation testing over network
    • file based propagation testing
    • visualize initial positions by holding propagation
    • vbo propagation
    • non-vbo propagation
    • threading sensor ids back to caller (vbo)
    • threading sensor ids back to caller (non-vbo)
  • BVH Splits
  • Datamodel
    • Performance Data Model examples
      • MySQL Performance Schema
    • Instrumenting Python Code
    • Profiling Python
    • Projects for instrumentation
    • Graphite : Graphing infrastructure
      • whisper
  • G4DAEView geometry cache
    • Fixed Problem was the time sorting again
  • Serialization
    • Current Solution : NPY
    • Alternatives serialization/deserialization to ROOT ?
      • NEXT
      • contenders
      • comparisons
      • capnproto
      • cereal
      • boost serialization
  • G4DAEView Dependencies
    • Dependencies Tree
    • Alternatives to GLUT ?
      • Implications of ancient OpenGL 2.1
      • GLFW
      • glfwcy with PyOpenGL and OpenGL 3.2
      • glfw python wrappers
      • migration from glumpy to glfw
  • G4DAEView Ideas
    • JSON State vending
    • Tight zooming not easy
    • Attempts to do rotation interpolation with no geometry visible cause NaN fails
    • During VBO structural changes
    • Live Style Change issues FIXED
    • Step Interpolation Visualization IMPLEMENTED
      • What about non-Chroma devices ?
      • Geometry Shaders
    • Node selection only applies to to particular geometry dyb/juno/lxe
    • Live Updating Test
      • worker
      • client
    • Next
      • improved structuring
      • Histogramming
        • issues
      • Photon provenance
      • ChromaOtherList for transport over ZMQ
      • Geant4 Chroma Process
      • Avoid Geometry Duplication
      • interactive target switching NEEDS OVERHAUL
      • smaller things
  • G4DAEView Architecture
    • Division of concerns
  • G4DAEView Issues
    • Fallovers
    • Photon Presentation
  • NAN Abort Photon
  • VBO Propagation Call Sequence needs simplification now that using NPL
  • G4DAECHROMA transport testing
    • Same Node Success
      • Client sends workload to broker
      • Worker polls the broker for smth to do
    • Normal Topology Success, via tunneling both client and worker
  • G4DAEChroma Memory Leak
    • Executive Summary
    • Initial Observation of 30G VSIZE
    • Large VSIZE
    • Not ballooning to 30G
    • vmmap
    • vmmap -resident
  • G4DAEChroma.cpp : ZMQResponder, CUDA kernel call
    • Progress
    • Motivation
    • Dependencies
    • Initialization
    • Propagation
    • NPY Geometry Cache
    • Potential Dependencies
      • CuPP
      • boost::program_options
      • boost::numeric::ublas::vector<double>
      • cuda::thrust
      • CUDA Unified Memory
    • Other Libs
  • G4DAEChroma CUDA tune
    • Small Problem Size
    • Large problem size
    • Variation of time with workload
    • Larger than 512 ?
    • Straggler Mode
    • Propagate Queues
  • Visualizing GenSteps
• swift
  • Apples SceneKit uses ColladaDOM it seems