WHAT YOU NEED to Evaluate an 3-D Reconstruction/Animation.

General Crash Reconstruction Tecnhiques
Crash tests, Pole Impacts
MSI
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WHAT YOU NEED to Evaluate an 3-D Reconstruction/Animation.

Post by MSI »

WHAT YOU NEED to Evaluate an 3-D Reconstruction/Animation. If you are faced with someone using 3D animation or simulation, what do you need to evaluate what they have done? These programs cost from ~$3000 up to~$20,000, so to facilitate the evaluation of an application of any of these programs, you need to obtain complete documentation of the analysis procedure.
  • Request complete inputs and outputs for any and all computer programs used
    • Printed and in computer form (CD or diskette or dropbox type file share system).
      • Printed output pages can be saved as text files and copied to a CD or uploaded to file share system to save paper
    IMPORTANT: Request input files in electronic form so the program can be obtained and the inputs loaded and the program rerun to verify results and test sensitivities.
    • Today with cloud scanning of scenes a reconstruction (by Leica, Trimble and/or Faro) can include gigabytes of information about the crash scene and vehicles which are NOT included in any printout (or if it is they will be thousands of pages of unintelligible numbers)…not quite full disclosure of inputs.
      This is WHY full input file in electronic form MUST be required.
  • Most of the programs include options for outputs.
    • The outputs should be set with ALL OPTIONS ON to obtain all the outputs and time history data, etc.
  • Request the program version, an indication of any add-ons or options used, etc.
  • If a video created, request all the files used to create the video:
    • CAD files, Animation files, spreadsheet files, any and all notes, etc.
      Cloud files:
      • For a simulation program to see a surface scanned with a cloud scanner, the cloud scan must be imported into the simulation program.
        Therefore both the cloud scan file(s) and the simulation input file(s) must be provided so they can be examined to determine if the cloud file was properly transformed and imported into the simulation programs.
Some papers and links written on the subject:
  • SAE paper number 1999-01-0101 “Computer Generated Trial Exhibits: A Post- Daubert Update
  • SAE paper number 940920 “Case Studies in Animation Foundation
  • SAE paper number 980018, “Documenting Scientific Visualizations and Computer Animations used in Collision Reconstruction Presentations“ which includes as the Summary: SAE papers can be ordered online at the SAE website: www.sae.org
    • “This paper has presented a proposed standard for documenting computer generated images, animations, scientific visualizations, etc. The basic standard is that any still images or videos should be documented such that any qualified analyst can reproduce them. This is the requirement for the scientific community in general and should be adopted in the crash reconstruction community. It is important to note that this standard does not refer to any method of generating these images or videos. There is no implication that any one method or any one program is superior to others. This standard addresses only the images and videos and does not address the analysis or opinions being expressed by analyst. However, the only way to fully understand the analysis being presented or discussed is to have the ability to duplicate the images or video being presented”

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