[Sim] Reduce a TruncTubs cutaway box to a reasonable size

[ianna]

PR description:

TruncTubs is a CMS-specific shape widely used in both CMS MagneticField geometry and CMS detector descriptions. It's defined as follows:

PR validation:

if this PR is a backport please specify the original PR and why you need to backport that PR:

Before submitting your pull requests, make sure you followed this checklist:

• verify that the PR is really intended for the chosen branch
• verify that changes follow CMS Naming, Coding, And Style Rules
• verify that the PR passes the basic test procedure suggested in the CMSSW PR instructions

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-29131/14043

• This PR adds an extra 16KB to repository

[cmsbuild]

A new Pull Request was created by @ianna (Ianna Osborne) for master.

It involves the following packages:

SimG4Core/Geometry

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@makortel, @rovere this is something you requested to watch as well.
@davidlange6, @silviodonato, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/5035/console Started: 2020/03/06 15:39

[etcherniaev]

The dimensions of the cutaway box may depend on how the box is centred. I've noticed in the GDML file that in case of YE1_br the box was shifted along X axis.

[cmsbuild]

+1
Tested at: 3caf242
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-45e4ca/5035/summary.html
CMSSW: CMSSW_11_1_X_2020-03-05-2300
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-45e4ca/5035/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 34
• DQMHistoTests: Total histograms compared: 2680577
• DQMHistoTests: Total failures: 39
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2680219
• DQMHistoTests: Total skipped: 319
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 33 files compared)
• Checked 147 log files, 16 edm output root files, 34 DQM output files

[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @davidlange6, @silviodonato, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[silviodonato]

+1