**What's new in Versi=
on 2.4**

SItoA version 2.4 is based on version 4.0.7.0 of the Arnold core.

New features include:

=E2=80=
=A2 Ray traced BSSRDFs: A new alternative to point-cloud subsur=
face scattering has been added. This method is brute-force ray-tracing base=
d, but produces visually identical results to the pointcloud technique. Thi=
s approach removes a number of shortcomings of the pointcloud method, tradi=
ng them for unbiased noise instead. The new method consumes zero extra memo=
ry, supports motion blur, supports interactive relighting, is fully multi-t=
hreaded, starts up immediately and does not degrade in performance as the s=
cattering radius shrinks. For backwards compatibility this is provided as a=
n option, with point clouds being the default setting. To use ray traced su=
bsurface scattering, check the Raytraced option from the Sampling controls dialog.

=E2=80=
=A2 Mesh light: There is a new type of light available called m=
esh_light which takes a polymesh as a parameter and emits light using the p=
olymesh's surface geometry. Read the mesh light topic for more details.

=E2=80=
=A2 A number of other improvements in the Arnold core are of in=
terest:

=E2=80=
=A2 Improved sampling at secondary bounces: The 2D sampling pat=
terns generated by Arnold will now be stratified even for secondary bounces=
instead of reverting to fully random sampling as before. This can greatly =
reduce the amount of noise, particularly when rendering things that are see=
n through near-specular effects like glossy reflections or refractions

&=
nbsp;

=E2=80=
=A2 Improved sampling for SSS Point cloud: When baking diffuse =
lighting calculations into the SSS pointcloud, Arnold now uses MIS (multipl=
e importance sampling) to reduce noise from large nearby area lights and th=
e skydome. This may increase the number of rays slightly, but give higher q=
uality sampling in those cases

=E2=80=
=A2 Improved smoothed normals: The quality of the smooth shadin=
g normals stored per-vertex in triangular tessellations has been improved b=
y adjusting the weights used to average the triangle normals around a verte=
x. In addition to triangle area, the weights now factor the angle between t=
he two triangle edges containing the shared vertex. This will be most evide=
nt for coarse meshes where the face normal and the smoothed vertex normals =
substantially differ.

**Note:**

We have finally removed support for Softimage 2010 in this release.

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