[WIP] feat: import of ePIC detector geometry into gen3

[wdconinc]

Not for merging.

This PR imports the ePIC detector geometry (current https://github.com/eic/epic main branch) into the Gen3 blueprints.

This is a draft PR simply intended to allow for sharing and commenting on code. Status in the comments since likely to change as new commits land.

[wdconinc]

This branch currently loads the geometry with a few exceptions:

• beampipe: hardcoded as in ODD, not imported from volume.
• VertexBarrel: QOL issue where we have a hardcoded constant number of z bins, but variable dd4hep constant for phi bins -> introduced a dd4hep constant for z bins as well
• ForwardTOF: no surfaces can be found for ForwardTOF_layer2 (but works fine for layer1)
  LayerBlueprintNode: no surfaces provided for ForwardTOF_layer2
• B0Tracker: no volumes found for this off-axis detector
  VolumeStack requires at least one volume

With the following code

  Acts::GeometryContext trackingGeoCtx;
  ActsExamples::ePICDetector::Config detectorConfig;
  detectorConfig.logLevel = Acts::Logging::Level::VERBOSE;
  detectorConfig.dd4hepLogLevel = Acts::Logging::Level::WARNING;
  detectorConfig.xmlFileNames.push_back(compact);
  detectorConfig.name = compact;
  ActsExamples::ePICDetector epicDetector(detectorConfig, trackingGeoCtx);

this runs through the following:

15:33:20    DD4hepDetect   DEBUG     *** Initial volume configuration:
15:33:20    DD4hepDetect   DEBUG     z: [ -1000.000 <-     0.000 ->  1000.000 ], r: [     0.000 <->    20.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -134.906 <-     0.045 ->   134.996 ], r: [    33.020 <->   130.221 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -256.500 <-     0.000 ->   256.500 ], r: [   258.016 <->   274.793 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -401.500 <-     0.000 ->   401.500 ], r: [   413.039 <->   429.572 ]
15:33:20    DD4hepDetect   DEBUG     z: [   244.845 <-   249.865 ->   254.885 ], r: [    31.763 <->   245.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -254.885 <-  -249.865 ->  -244.845 ], r: [    31.763 <->   245.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [   444.845 <-   449.865 ->   454.885 ], r: [    31.763 <->   420.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -454.885 <-  -449.865 ->  -444.845 ], r: [    31.763 <->   420.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [   694.845 <-  1024.865 ->  1354.885 ], r: [    33.460 <->   426.400 ]
15:33:20    DD4hepDetect   DEBUG     z: [ -1024.885 <-  -834.865 ->  -644.845 ], r: [    31.763 <->   426.400 ]
15:33:20    DD4hepDetect   DEBUG     z: [  -980.000 <-   212.500 ->  1405.000 ], r: [   546.755 <->   588.755 ]
15:33:20    DD4hepDetect   DEBUG     z: [ -1675.000 <-    25.000 ->  1725.000 ], r: [   730.965 <->   762.162 ]
15:33:20    DD4hepDetect   DEBUG     z: [  1498.995 <-  1567.995 ->  1636.995 ], r: [    76.240 <->   405.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [ -1211.995 <- -1142.995 -> -1073.995 ], r: [    65.000 <->   405.000 ]
15:33:20    DD4hepDetect   DEBUG     z: [ -1110.000 <-   175.000 ->  1460.000 ], r: [   629.336 <->   654.424 ]
15:33:20    DD4hepDetect   DEBUG     z: [  1856.187 <-  1861.337 ->  1866.487 ], r: [   101.000 <->   601.802 ]
15:33:20    DD4hepDetect   VERBOSE   Checking volume alignment
15:33:20    DD4hepDetect   VERBOSE   Checking volume #0 at z: 0
15:33:20    DD4hepDetect   VERBOSE   - Local transform is:
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
15:33:20    DD4hepDetect   VERBOSE    -> Rotation is ok!
15:33:20    DD4hepDetect   VERBOSE    -> Translation in x/y is ok!
15:33:20    DD4hepDetect   VERBOSE   Checking volume #1 at z: 0.045
15:33:20    DD4hepDetect   VERBOSE   - Local transform is:
           1            0            0            0
           0            1            0 -3.55271e-15
           0            0            1        0.045
           0            0            0            1
15:33:20    DD4hepDetect   VERBOSE    -> Rotation is ok!
15:33:20    DD4hepDetect   VERBOSE    -> Translation in x/y is ok!
15:33:20    DD4hepDetect   VERBOSE   Checking volume #2 at z: 0
15:33:20    DD4hepDetect   VERBOSE   - Local transform is:
        1         0         0 0.0402683
        0         1         0         0
        0         0         1         0
        0         0         0         1
15:33:20    DD4hepDetect   VERBOSE    -> Rotation is ok!
15:33:20    DD4hepDetect   ERROR     Volumes are not aligned: translation in x or y
terminate called after throwing an instance of 'std::invalid_argument'
  what():  Volumes are not aligned: translation in x or y

[wdconinc]

The volumes are not aligned due to the an asymmetric placement of support braces in the SiSagittaBarrel, https://github.com/eic/epic/pull/933/files#r2583195150. That may not be intentional, or maybe it is. In any case, the asymmetric placement of supports should not block the geometry from being converted at this point. The symmetry requirement should be evaluated.

[wdconinc]

Output with ee1b8df:
test_ACTS_gen3.txt