Merge pull request #827 from dictoon/master
small fixes and cleanups.
fixed two bugs in standard dipole implementation.
added constant foundation::RcpFourPi = 1/(4*Pi).
fixed improperly rounded constant.
fixed computation of distances to real/virtual point light sources in…
… standard dipole model.
fixed compilation on Windows.
increased epsilon value in assertion.
Merge pull request #826 from est77/est_sss7
More refactors & more tests
Precompute the max profile radius.
Tests improvements and refactors
Added a base class for Dipole BSSRDFs and refactored common code.
Enable ND BSSRDF for travis builds
Merge pull request #825 from dictoon/master
fixed sampling of the directional dipole BSSRDF.
fixed selection of color channel, removed test code.
added standard dipole BSSRDF.
Merge branch 'master' of github.com:appleseedhq/appleseed
Merge pull request #824 from dictoon/master
Minor fixes and cleanups
improved reporting of invalid pixel samples.
Added missing fresnel param to OSL phong
Merge pull request #822 from est77/est_OSL_layered
moved OSL BSDFs to their own folder
Added fresnel multiplier to ashikmin
Get rid of oslashikhminbrdf. Use the standard ashikhminbrdf instead.
fixed foundation::min_index(), max_index(), min_abs_index() and max_a…
…bs_index() for spectra.
for consistency, added a variant of normalized_diffusion_max_radius()…
… that takes d instead of (l, s).
removed redundant #include statement.