Dynamically constructs a Geant4 world from STEP solids and assemblies. More...

#include <G4OCCTDetectorConstruction.hh>

Inheritance diagram for G4OCCTDetectorConstruction:

Public Member Functions
	G4OCCTDetectorConstruction ()

	~G4OCCTDetectorConstruction () override

G4VPhysicalVolume *	Construct () override

void	LoadMaterial (G4String xmlFile)
	Queue a material-map XML file to be loaded at construction time.

void	AddSTEP (G4String stepFile)
	Queue a STEP file as a solid or assembly (auto-detected).

void	AddSolid (G4String stepFile, G4String materialName="")
	Explicitly queue a STEP file as a G4OCCTSolid with an optional material override.

void	AddAssembly (G4String stepFile)
	Explicitly queue a STEP file as a G4OCCTAssemblyVolume.

void	SetWorldMaterial (G4String name)
	Set the world volume material by Geant4/NIST name.

void	SetWorldHalfSize (G4ThreeVector halfSize)
	Set the world half-size. Overrides auto-sizing.

Detailed Description

Dynamically constructs a Geant4 world from STEP solids and assemblies.

Geometry is accumulated via public methods (called from positional CLI arguments in main()) or via the /G4OCCT/ messenger commands registered in the constructor.

Messenger commands

Command	Effect
`/G4OCCT/load/step <file>`	Auto-detect and queue as solid or assembly
`/G4OCCT/load/assembly <file>`	Force assembly import via XDE
`/G4OCCT/load/material <file>`	Parse material-map XML
`/G4OCCT/world/setMaterial <name>`	World volume material (default G4_AIR)
`/G4OCCT/world/setSize <x> <y> <z> <unit>`	World half-size as 3-vector
`/G4OCCT/vis/open [driver]`	Open a visualisation driver
`/G4OCCT/vis/scene`	Redraw and refresh the current scene

World sizing

If no explicit size is set, Construct() computes the world half-size as 110 % of the axis-aligned bounding box of all placed volumes. An empty world defaults to a 1 m³ box.

Material resolution

Resolution order: G4OCCTMaterialMap → G4NistManager lookup → fatal G4Exception. Passing material XML files via LoadMaterial() before Construct() is strongly recommended for STEP files that embed non-NIST material names.

Definition at line 53 of file G4OCCTDetectorConstruction.hh.