Blender Git Commit Log

Part one of the final yafray commit.

Totally updated blender shader in yafray, hopefully better matches blender
results. Though ramps are now partially supported, they cannot work in all
cases properly in yafray, and in fact are a bit useless probably as far as
yafray is concerned. In fact the 'Result' ramp input mode is not supported
at all, because it works on the total lighting result, and in a yafray
shader this is not possible since it works per light.
Also, since Blender and Yafray have totally different lighting models,
the 'Energy' ramp input mode also won't generally give the same results
as in Blender, since it works with light energy and in yafray this is
different from Blender. Even worse, the only ramp shader that will work
properly when used with GI is the 'Normal' ramp input mode.
As contradictory as this might seem, at various stages of the GI process,
lighting is not known, so properly getting light (ramp 'energy' mode)
or shader information (ramp 'shader' mode, which depends on lighting)
is not possible. Which all means that when the ramp is in 'energy' or
'shader' mode and using it with GI enabled, yafray can only 'see' the
underlying material color, not the ramps, which results in a mix of the
ramp colors (from direct light) with the material color (from indirect light).
There is currently nothing that can be done about that.

The supported texture mapping modes now includes raymir as well, transparency
as far as texturing is concerned now works similar to Blender, with the
exception that you still have to set alpha to a low value to get any
transparency effect at all in yafray. So the Blender 'filter' parameter
now also will affect yafray.
All texture blending modes are now supported (same for ramps).
'Translu' and 'Amb' texture modulation are not supported.
Texture interpolation can be switched off ('InterPol' switch in blender
image texture button section).

All Blender brdf models (aka 'shaders' for the Blender users) are now supported,
and again, you won't necessarily get the same results as in Blender.
The reason for that is partially of course the lighting differences, but also,
not all Blender 'shader' implementations are actually correct, and copying
those errors just for the sake of matching Blender results doesn't really
seem like a good idea...
Though this really is only the case for WardIso, less so for Minnaert and
Blinn, which in yafray are more or less (but not totally) a copy of
the Blender code.
In any case, in practice those differences might not be
too noticable at all (I hope).

Continue to the next part...