feat: GeoModel plugin changes for ITk building.

Examples/Detectors/CMakeLists.txt

@@ -4,5 +4,6 @@ add_subdirectory(GenericDetector)
 add_subdirectory_if(Geant4Detector ACTS_BUILD_EXAMPLES_GEANT4)
 add_subdirectory(MagneticField)
 add_subdirectory(TGeoDetector)
+add_subdirectory(ITkModuleSplitting)
 add_subdirectory(TelescopeDetector)
 add_subdirectory_if(MuonSpectrometerMockupDetector ACTS_BUILD_EXAMPLES_GEANT4)

Examples/Detectors/ITkModuleSplitting/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_library(ActsExamplesITkModuleSplitting INTERFACE)
+target_include_directories(
+    ActsExamplesITkModuleSplitting
+    INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+)
+
+install(DIRECTORY include/ActsExamples DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

Examples/Detectors/ITkModuleSplitting/include/ActsExamples/ITkModuleSplitting/ITkModuleSplitting.hpp

@@ -0,0 +1,139 @@
+// This file is part of the Acts project.
+//
+// Copyright (C) 2024 CERN for the benefit of the Acts project
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#pragma once
+
+#include "Acts/Definitions/Algebra.hpp"
+#include "Acts/Surfaces/AnnulusBounds.hpp"
+#include "Acts/Surfaces/RectangleBounds.hpp"
+#include "Acts/Surfaces/Surface.hpp"
+#include "Acts/Surfaces/SurfaceBounds.hpp"
+
+#include <algorithm>
+#include <array>
+#include <cstddef>
+#include <sstream>
+
+namespace ActsExamples::ITk {
+
+template <typename detector_element_t, typename element_factory_t>
+inline std::vector<std::shared_ptr<const detector_element_t>> splitBarrelModule(
+    const Acts::GeometryContext& gctx,
+    const std::shared_ptr<const detector_element_t>& detElement,
+    unsigned int nSegments, const element_factory_t& factory,
+    const std::string& name,
+    const Acts::Logger& logger = Acts::getDummyLogger()) {
+  // Retrieve the surface
+  const Acts::Surface& surface = detElement->surface();
+  const Acts::SurfaceBounds& bounds = surface.bounds();
+  if (bounds.type() != Acts::SurfaceBounds::eRectangle || nSegments <= 1u) {
+    ACTS_WARNING("Invalid splitting config for barrel node: "
+                 << name << "! Node will not be slpit.");
+    return {detElement};
+  }
+
+  // Output container for the submodules
+  std::vector<std::shared_ptr<const detector_element_t>> detElements = {};
+  detElements.reserve(nSegments);
+
+  // Get the geometric information
+  const Acts::Transform3& transform = surface.transform(gctx);
+  // Determine the new bounds
+  const std::vector<double> boundsValues = bounds.values();
+
+  double lengthX = (boundsValues[Acts::RectangleBounds::eMaxX] -
+                    boundsValues[Acts::RectangleBounds::eMinX]) /
+                   nSegments;
+  double lengthY = boundsValues[Acts::RectangleBounds::eMaxY] -
+                   boundsValues[Acts::RectangleBounds::eMinY];
+  auto rectBounds =
+      std::make_shared<Acts::RectangleBounds>(0.5 * lengthX, 0.5 * lengthY);
+  // Translation for every subelement
+  auto localTranslation = Acts::Vector2(-0.5 * lengthX * (nSegments - 1), 0.);
+  const auto step = Acts::Vector2(lengthX, 0.);
+  ACTS_DEBUG("Rectangle bounds for new node (half length): " +
+             std::to_string(rectBounds->halfLengthX()) + ", " +
+             std::to_string(rectBounds->halfLengthY()));
+
+  for (std::size_t i = 0; i < nSegments; i++) {
+    Acts::Vector3 globalTranslation =
+        surface.localToGlobal(gctx, localTranslation, {}) -
+        transform.translation();
+    auto elemTransform =
+        Acts::Transform3(transform).pretranslate(globalTranslation);
+    detElements.emplace_back(factory(elemTransform, rectBounds));
+
+    localTranslation += step;
+  }
+  return detElements;
+}
+
+template <typename detector_element_t, typename element_factory_t>
+inline std::vector<std::shared_ptr<detector_element_t>> splitDiscModule(
+    const Acts::GeometryContext& gctx,
+    const std::shared_ptr<detector_element_t>& detElement,
+    const std::vector<std::pair<double, double>>& splitRanges,
+    const element_factory_t& factory, const std::string& name,
+    const Acts::Logger& logger = Acts::getDummyLogger()) {
+  // Retrieve the surface
+  const Acts::Surface& surface = detElement->surface();
+  const Acts::SurfaceBounds& bounds = surface.bounds();
+
+  // Check annulus bounds origin
+  auto printOrigin = [&](const Acts::Surface& sf) {
+    Acts::Vector3 discOrigin =
+        sf.localToGlobal(gctx, Acts::Vector2(0., 0.), Acts::Vector3::Zero());
+    std::string out =
+        "Disc surface origin at: " + std::to_string(discOrigin[0]) + ", " +
+        std::to_string(discOrigin[1]) + ", " + std::to_string(discOrigin[2]);
+    return out;
+  };
+  ACTS_DEBUG(printOrigin(surface));
+
+  if (bounds.type() != Acts::SurfaceBounds::eAnnulus || splitRanges.empty()) {
+    ACTS_WARNING("Invalid splitting config for disk node: "
+                 << name << "! Node will not be slpit.");
+    return {detElement};
+  }
+
+  auto nSegments = splitRanges.size();
+
+  // Output container for the submodules
+  std::vector<std::shared_ptr<const detector_element_t>> detElements = {};
+  detElements.reserve(nSegments);
+
+  // Get the geometric information
+  const Acts::Transform3& transform = surface.transform(gctx);
+  const std::vector<double> boundsValues = bounds.values();
+  std::array<double, Acts::AnnulusBounds::eSize> values{};
+
+  std::copy_n(boundsValues.begin(), Acts::AnnulusBounds::eSize, values.begin());
+
+  for (std::size_t i = 0; i < nSegments; i++) {
+    if (boundsValues[Acts::AnnulusBounds::eMinR] > splitRanges[i].first ||
+        boundsValues[Acts::AnnulusBounds::eMaxR] < splitRanges[i].second) {
+      ACTS_WARNING(
+          "Radius pattern not within the original bounds, node will not be "
+          "split!");
+      return {detElement};
+    }
+
+    values[Acts::AnnulusBounds::eMinR] = splitRanges[i].first;
+    values[Acts::AnnulusBounds::eMaxR] = splitRanges[i].second;
+    auto annulusBounds = std::make_shared<Acts::AnnulusBounds>(values);
+    ACTS_DEBUG(
+        "New r bounds for node: " + std::to_string(annulusBounds->rMin()) +
+        ", " + std::to_string(annulusBounds->rMax()));
+
+    auto element = factory(transform, annulusBounds);
+    detElements.push_back(std::move(element));
+  }
+  return detElements;
+}
+
+}  // namespace ActsExamples::ITk

Examples/Detectors/TGeoDetector/CMakeLists.txt

@@ -17,6 +17,7 @@ target_link_libraries(
         ActsPluginJson
         ActsExamplesFramework
         ActsExamplesDetectorGeneric
+        ActsExamplesITkModuleSplitting
 )
 
 install(

Examples/Detectors/TGeoDetector/src/TGeoITkModuleSplitter.cpp

@@ -14,12 +14,15 @@
 #include "Acts/Surfaces/RectangleBounds.hpp"
 #include "Acts/Surfaces/Surface.hpp"
 #include "Acts/Surfaces/SurfaceBounds.hpp"
+#include "ActsExamples/ITkModuleSplitting/ITkModuleSplitting.hpp"
 
 #include <algorithm>
 #include <array>
 #include <cstddef>
 #include <sstream>
 
+namespace {}
+
 ActsExamples::TGeoITkModuleSplitter::TGeoITkModuleSplitter(
     const ActsExamples::TGeoITkModuleSplitter::Config& cfg,
     std::unique_ptr<const Acts::Logger> logger)
@@ -88,55 +91,16 @@ ActsExamples::TGeoITkModuleSplitter::splitBarrelModule(
     const Acts::GeometryContext& gctx,
     const std::shared_ptr<const Acts::TGeoDetectorElement>& detElement,
     unsigned int nSegments) const {
-  // Retrieve the surface
-  auto identifier = detElement->identifier();
-  const Acts::Surface& surface = detElement->surface();
-  const Acts::SurfaceBounds& bounds = surface.bounds();
-  if (bounds.type() != Acts::SurfaceBounds::eRectangle || nSegments <= 1u) {
-    ACTS_WARNING("Invalid splitting config for barrel node: " +
-                 std::string(detElement->tgeoNode().GetName()) +
-                 "! Node will not be slpit.");
-    return {detElement};
-  }
-
-  // Output container for the submodules
-  std::vector<std::shared_ptr<const Acts::TGeoDetectorElement>> detElements =
-      {};
-  detElements.reserve(nSegments);
-
-  // Get the geometric information
-  double thickness = detElement->thickness();
-  const Acts::Transform3& transform = surface.transform(gctx);
-  // Determine the new bounds
-  const std::vector<double> boundsValues = bounds.values();
-  double lengthX = (boundsValues[Acts::RectangleBounds::eMaxX] -
-                    boundsValues[Acts::RectangleBounds::eMinX]) /
-                   nSegments;
-  double lengthY = boundsValues[Acts::RectangleBounds::eMaxY] -
-                   boundsValues[Acts::RectangleBounds::eMinY];
-  auto rectBounds =
-      std::make_shared<Acts::RectangleBounds>(0.5 * lengthX, 0.5 * lengthY);
-  // Translation for every subelement
-  auto localTranslation = Acts::Vector2(-0.5 * lengthX * (nSegments - 1), 0.);
-  const auto step = Acts::Vector2(lengthX, 0.);
-  ACTS_DEBUG("Rectangle bounds for new node (half length): " +
-             std::to_string(rectBounds->halfLengthX()) + ", " +
-             std::to_string(rectBounds->halfLengthY()));
+  auto name = detElement->tgeoNode().GetName();
 
-  for (std::size_t i = 0; i < nSegments; i++) {
-    Acts::Vector3 globalTranslation =
-        surface.localToGlobal(gctx, localTranslation, {}) -
-        transform.translation();
-    auto elemTransform =
-        Acts::Transform3(transform).pretranslate(globalTranslation);
-    auto element = std::make_shared<const Acts::TGeoDetectorElement>(
-        identifier, detElement->tgeoNode(), elemTransform, rectBounds,
-        thickness);
-    detElements.push_back(std::move(element));
+  auto factory = [&](const auto& trafo, const auto& bounds) {
+    return std::make_shared<const Acts::TGeoDetectorElement>(
+        detElement->identifier(), detElement->tgeoNode(), trafo, bounds,
+        detElement->thickness());
+  };
 
-    localTranslation += step;
-  }
-  return detElements;
+  return ITk::splitBarrelModule(gctx, detElement, nSegments, factory, name,
+                                logger());
 }
 
 /// If applicable, returns a split detector element
@@ -146,55 +110,14 @@ ActsExamples::TGeoITkModuleSplitter::splitDiscModule(
     const std::shared_ptr<const Acts::TGeoDetectorElement>& detElement,
     const std::vector<ActsExamples::TGeoITkModuleSplitter::SplitRange>&
         splitRanges) const {
-  // Retrieve the surface
-  auto identifier = detElement->identifier();
-  const Acts::Surface& surface = detElement->surface();
-  const Acts::SurfaceBounds& bounds = surface.bounds();
+  auto name = detElement->tgeoNode().GetName();
 
-  // Check annulus bounds origin
-  auto printOrigin = [&](const Acts::Surface& sf) {
-    Acts::Vector3 discOrigin =
-        sf.localToGlobal(gctx, Acts::Vector2(0., 0.), Acts::Vector3::Zero());
-    std::string out =
-        "Disc surface origin at: " + std::to_string(discOrigin[0]) + ", " +
-        std::to_string(discOrigin[1]) + ", " + std::to_string(discOrigin[2]);
-    return out;
+  auto factory = [&](const auto& trafo, const auto& bounds) {
+    return std::make_shared<const Acts::TGeoDetectorElement>(
+        detElement->identifier(), detElement->tgeoNode(), trafo, bounds,
+        detElement->thickness());
   };
-  ACTS_DEBUG(printOrigin(surface));
 
-  if (bounds.type() != Acts::SurfaceBounds::eAnnulus || splitRanges.empty()) {
-    ACTS_WARNING("Invalid splitting config for disk node: " +
-                 std::string(detElement->tgeoNode().GetName()) +
-                 "! Node will not be slpit.");
-    return {detElement};
-  }
-
-  auto nSegments = splitRanges.size();
-
-  // Output container for the submodules
-  std::vector<std::shared_ptr<const Acts::TGeoDetectorElement>> detElements =
-      {};
-  detElements.reserve(nSegments);
-
-  // Get the geometric information
-  double thickness = detElement->thickness();
-  const Acts::Transform3& transform = surface.transform(gctx);
-  const std::vector<double> boundsValues = bounds.values();
-  std::array<double, Acts::AnnulusBounds::eSize> values{};
-  std::copy_n(boundsValues.begin(), Acts::AnnulusBounds::eSize, values.begin());
-
-  for (std::size_t i = 0; i < nSegments; i++) {
-    values[Acts::AnnulusBounds::eMinR] = splitRanges[i].first;
-    values[Acts::AnnulusBounds::eMaxR] = splitRanges[i].second;
-    auto annulusBounds = std::make_shared<Acts::AnnulusBounds>(values);
-    ACTS_DEBUG(
-        "New r bounds for node: " + std::to_string(annulusBounds->rMin()) +
-        ", " + std::to_string(annulusBounds->rMax()));
-
-    auto element = std::make_shared<const Acts::TGeoDetectorElement>(
-        identifier, detElement->tgeoNode(), transform, annulusBounds,
-        thickness);
-    detElements.push_back(std::move(element));
-  }
-  return detElements;
+  return ITk::splitDiscModule(gctx, detElement, splitRanges, factory, name,
+                              logger());
 }

Examples/Python/CMakeLists.txt

@@ -88,7 +88,10 @@ else()
 endif()
 
 if(ACTS_BUILD_PLUGIN_GEOMODEL)
-    target_link_libraries(ActsPythonBindings PUBLIC ActsPluginGeoModel)
+    target_link_libraries(
+        ActsPythonBindings
+        PUBLIC ActsPluginGeoModel ActsExamplesITkModuleSplitting
+    )
     target_sources(ActsPythonBindings PRIVATE src/GeoModel.cpp)
 else()
     target_sources(ActsPythonBindings PRIVATE src/GeoModelStub.cpp)