Andreas Salzburger

feat: experimental geometry - surfaces, portals and volumes

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This PR is introducing an attempt of an alternative geometry, which is built only from * surface objects * portals (containing surface objects) * detector volumes It uses the `Delegate`...

docs: first brush over the geometry pages

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This PR combines the two geometry pages into one and adds some additional info and highlights.

docs: adding Fatras description

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This PR adds the Fatras documentation consisting of * Fatras simulation * Digitisation * Configuration

Fatras: Bethe-Heitler calculation wrong?

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While writing the documentation for Fatras, I've added some basic UnitTests to #1402 in order to create and show the principles of the particle interaction mode. This is the test:...

feat: Adding unit tests for perigee propagation outside beam pipe

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This adds a (currently failing) unit test when starting from a perigee that is not within the beam pipe but within the pixel barrel volume. Several issues can be studies...

feat!: EXPERIMENTAL! world without layers

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Thisis an early DRAFT of a potential geometry re-write: - without layers, but volumes taking the role of layers - const correctness with `internal/external const` access to layers The naming...

fix: avoid double-static cast

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```suggestion SimParticle fw(particleId, pdg, ``` _Originally posted by @FabianKlimpel in https://github.com/acts-project/acts/pull/638#discussion_r552395121_

feat: material mapper in core (MM4)

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This is the first PR in a series that divides the Material Mapping into logical, unit testable modules: 1) Finding intersections with surfaces and associations to volumes (MM2) 2) Assigning...

fix: add argparse and folder check to propagation script

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The propagation example does not run out of the box. This PR fixes it and adds some args from command line.

feat: error parameterisation (and assignment) for geometric digitisation

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The geometric digitisation so far did set the pitch size `p/std::sqrt(12)` as an estimated error, but this is not correct, in general, it overestimates the variances. This PR introduces a...