Commit 003a1203 authored by Wouter Deconinck's avatar Wouter Deconinck
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simple_detector.md: updating for dd4pod to edm4hep

parent a116097f
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......@@ -152,11 +152,7 @@ Refer to the [GPS Documentation](https://geant4-userdoc.web.cern.ch/UsersGuides/
### Simulation output data model
The geant4 output data model used by `npsim` is [described in a single yaml file](https://eicweb.phy.anl.gov/EIC/NPDet/-/blob/master/src/dd4pod/dd4hep.yaml).
Note that this is purposefully factorized from the larger EIC data model, `eicd`, which is used
at every step post geant4.
https://eic.phy.anl.gov/eicd/
The geant4 output data model used by `npsim` is the EDM4hep data model, [described in a single yaml file](https://github.com/key4hep/EDM4hep/blob/master/edm4hep.yaml). This is also the data model used in evey step post geant4, complemented with the `eicd` data model [described in a single yaml file](https://eicweb.phy.anl.gov/EIC/eicd/-/blob/master/eic_data.yaml).
### Cell ID to position
......@@ -188,10 +184,10 @@ Later on you can see its use while looping over hits:
auto pos0 = h.position;
auto pos1 = cellid_converter.position(h.cellID);
```
Here `pos0` is a [dd4pod tracker hit](https://eic.phy.anl.gov/npdet/ref_doc/classdd4pod_1_1_tracker_hit.html)
Here `h` is a [EDM4hep SimTrackerHit](https://edm4hep.web.cern.ch/classedm4hep_1_1_sim_tracker_hit.html)
which has `position`, a
[dd4pod four vector](https://eic.phy.anl.gov/npdet/ref_doc/classdd4pod_1_1_four_vector.html).
This is the position (and time) of the Geant4 step through the sensitive tracking volume<sup>1</sup>.
[Vector3d vector](https://edm4hep.web.cern.ch/classedm4hep_1_1_vector3d.html).
This is the position of the Geant4 step through the sensitive tracking volume<sup>1</sup>.
`pos1` is a three vector of the smallest sensitive detector segment.
The converter tool is used along with the hit's `cellID` (i.e. unique channel number) to look up this position<sup>2</sup>.
......
......@@ -28,7 +28,7 @@ Building a new (generic) detector using dd4hep is rather straight forward if we
make the following assumptions.
1. We will use the built-in sensitive detectors
2. We will use the dd4pod data model (i.e. use `npsim`)
2. We will use the edm4hep data model
### Compiling a new detector
......
......@@ -4,7 +4,7 @@
## Juggler Overview
Juggler is a Gaudi based event processing framework which uses the [eicd](https://eic.phy.anl.gov/eicd) data model.
Juggler is a Gaudi based event processing framework which uses the [edm4hep](https://cern.ch/edm4hep) data model.
### Algorithms
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