Monte Carlo Absorption correction

[Nick Draper]

Moved to Martyn Gigg, Russell will still be onvolved, but in a more distant role

[Martyn Gigg]

(In [6691]) Added a BoundingBox class and implemented caching at the CompAssembly level. Note that there are still several functions using the old getBoundingBox methods but this covers a lot of the needed code for the MC correction. Re #1212

[Martyn Gigg]

(In [6695]) Remove class name from header declaration to fix build. Re #1212

[Martyn Gigg]

(In [6860]) More updates to geometry for ray tracing/Monte Carlo framework, Re #1212. Removed unused material fields from Object class, Re #1735

[Martyn Gigg]

(In [6861]) Missed a reference to a function in MantidPlot code. Re #1212

[Janik Zikovsky]

(Sorry I replied in the wrong ticket)

Hi Martyn,

Your last change broke some of the behaviour of the Instrument 3D view for RectangularDetectors. To reproduce:

1. LoadEmptyInstrument with the SNAP_Definition.xml file.
2. Show Instrument menu. You notice that only one sphere is shown (the sample I think) because the bounding box is ~ null in size.
3. Click on any rectangular detector E1 E2 etc. in the view and nothing is shown. This all used to work and the RectangularDetector bounding boxes returned correctly.

[Martyn Gigg]

(In [6871]) Move the Instrument and Instrument interface classes down to Geometry. The new raytracing framework needs instrument access and it should all be in geometry. Also, given that everything else was defined in geometry it seems to make more sense to have it all in one place. Re #1212

[Martyn Gigg]

(In [6872]) Fix tests which contained references to API::Instrument. Not sure why they ran when I tried them... Re #1212

[Martyn Gigg]

(In [6873]) Missed a few forward declarations and apparently "Find All" doesn't mean that. Re #1212

[Martyn Gigg]

(In [6875]) Revert some changes to Rectangular detector that have broken Janik's functionality until I get a better understanding of why the GUI gives different answers for bounding boxes than the unit tests. Re #1212

[Martyn Gigg]

(In [6901]) Add a getChild access method as well as the operator[] to the component assembly interface so that it's easier to use with pointers. Re #1212

[Martyn Gigg]

(In [6905]) Reinstate original changes to RectangularDetector and update LoadInstrument to take the shape from the correct tag in the instrument definition. Re #1212

[Martyn Gigg]

(In [6907]) Missed the MantidPlot actor class on last check in. Re #1212

[Martyn Gigg]

(In [7000]) Add InstrumentRayTracer class. Also updated names of Geometry::Track related classes and members so that they are easier to read. A fair few changes but worth it for clarity. Re #1212

[Martyn Gigg]

(In [7001]) Fix tests. Missed a modifier on a helper function to allow passing temporary values. Re #1212

[Martyn Gigg]

(In [7361]) Altered slightly how the ray tracing framework and tracks in general accumulate their intersections results to improve the performance of tracing. Also altered Object bounding boxes so that they are no longer created with the new operator. Re #1212

[Martyn Gigg]

(In [7675]) Added a random number generator interface along with an implementation of the Mersenne Twister 19937 algorithm from boost. Re #1212

[Martyn Gigg]

(In [7680]) Fix a compiler bug with the older version of boost on rhel5. Re #1212

[Martyn Gigg]

(In [7821]) Adding the SampleEnvironment class plus changes around Geometry for the Monte Carlo work. Some changes in Geometry just clear warnings surrounding unitialized objects in copy constructors for class with virtual base classes. Other changes revolve around materials. Re #1212

[Martyn Gigg]

(In [7822]) Add missing export modifier for Windows. Re #1212

[Martyn Gigg]

(In [7823]) Fix method call after name change. Re #1212

[Martyn Gigg]

(In [7896]) Update the material class. Re #1212

[Martyn Gigg]

(In [7901]) Missed a file. Re #1212

[Martyn Gigg]

(In [7936]) MC Absorption correction. Re #1212

[Martyn Gigg]

(In [7938]) Fix for windows build. Re #1212

[Nick Draper]

Bulk move of tickets to iteration 27, if your ticket is essential for Iteration 26 then move it back.

[Nick Draper]

Sorry I didn't mean to move these ones reverting back to It 26

[Russell Taylor]

(In [8209]) Add new InstrumentValidator to input workspace to prevent seg fault if no instrument defined. Re #1212. Other diffs are simply replacing tabs with spaces.

[Russell Taylor]

Looks good up to this point. Testing has included the following:

• Various sample shapes - cylinder, flat plate. Agrees with 'old' absorption correction method.
• Adding a simple sample environment.
• Including spectra with no detector.
• Changing the seed.
• Checked for memory leaks - none found.

[Stuart Campbell]

This ticket has been transferred to github issue ​2059