Ray-tracing mode does not work in IE Sample

Dear kgv,

please check the fix in branch CR24878.

Please test the patch for OCCT671 beta.

Dear kgv,

please review modified patch in branch CR24878.

Please test.

Dear Commenter 3,

Branch CR24878 (and products from GIT master) was compiled on Linux, Windows and MacOS platforms and tested.
[revision removed]

Number of compiler warnings:

occt component :
Linux: 31 (17 on master 6.8.0)
Windows: 0 (0 on master)

products component :
Linux: 11 (11 on master)
Windows: 2 (2 on master)

Regressions/Differences:
No regressions

Testing cases:
Not needed

Testing on Linux:
Total MEMORY difference: 396892160 / 398472992
Total CPU difference: 57732.64000000014 / 52878.27999999996

Testing on Windows:
Total MEMORY difference: 438221564 / 438787376
Total CPU difference: 43406.875 / 35514.828125

There are no differences in images found by testdiff.

Ray-tracing works properly in QT Products samples (Parasolid, ACIS, etc) with enabled VBO.