[ALICE 3] Add IRIS option with inclined walls material

[plariono]

This PR introduces a new geometry-building option:
createIRISGeometry3InclinedWalls(TGeoVolume* motherVolume);

The new option builds the same full cylindrical IRIS geometry as createIRISGeometryFullCyl, and additionally inserts three inclined wall structures in the barrel region that correspond to the petal design with the inclined walls.

✨ Key Features

• Adds 3 equally spaced inclined ribs (120° apart in φ).
• Each rib is composed of two TGeoBBox segments:
  • Segment 1: from tangency near L0 to the inner surface of L1.
  • Segment 2: from the outer surface of L1 to the inner surface of L2.
• Walls are:
  • Tangentially oriented,
  • Confined strictly to the gaps between cylindrical layers,
  • Constructed with finite thickness (0.4 mm) of Al 5083,
  • Implemented with thickness-aware geometric bounds to avoid overlaps with L0/L1/L2.
• Uses the same cylindrical shell thickness and Z-extent as the existing full-cylinder geometry.
• Fully integrated into the existing vacuum cutout / boolean solid logic.

Usage:
--configKeyValues "TRKBase.layoutVD=kIRISFullCyl3InclinedWalls"

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[njacazio]

Ciao @plariono many thanks! Does the geometry introduce overlaps?

[plariono]

Hi @njacazio, you mean overlaps with the layers? No, it's safe.

[plariono]

Added the 3rd segment up to R = 47.5 mm:

[alibuild]

Error while checking build/O2/fullCI_slc9 for e6dd98a at 2026-02-25 18:52:

No log files found

Full log here.