@ -40,7 +40,7 @@ Only affects objects that render with shaders (see 'force shaders' option).
Always affects terrain.
Leaving this option at its default makes the lighting compatible with Morrowind's fixed-function method,
but the lighting may appear dull and there might be colour shifts.
but the lighting may appear dull and there might be colour shifts.
Setting this option to 'false' results in more dynamic lighting.
auto use object normal maps
@ -152,32 +152,51 @@ lighting method
---------------
:Type:string
:Range:legacy|default|experimental
:Range:legacy|shaders compatibility|shaders
:Default:default
Sets the internal handling of light sources.
Sets the internal handling of light sources.
'legacy' is restricted to a maximum of 8 lights per object and guarantees fixed function pipeline compatible lighting.
'legacy' is restricted to 8 lights per object and emulates fixed function
pipeline compatible lighting.
'default' removes the light limit via :ref:`max lights` and follows a new attenuation formula which can drastically reduce light popping and seams.
This mode also enables vertex lighting on groundcover, which is otherwise completely disabled with 'legacy'.
It is recommended to use this mode with older hardware, as the technique ensures a range of compatibility equal to that of 'legacy'.
'shaders compatibility' removes the light limit via :ref:`max lights` and
follows a modifed attenuation formula which can drastically reduce light popping
and seams. This mode also enables lighting on groundcover and a configurable
light fade. It is recommended to use this with older hardware and a light limit
closer to 8. Because of its wide range of compatibility it is set as the
default.
'experimental' carries all of the benefits that 'legacy' has, but uses a modern approach that allows for a higher 'max lights' count with little to no performance penalties on modern hardware.
'shaders' carries all of the benefits that 'shaders compatibility' does, but
uses a modern approach that allows for a higher :ref:`max lights` count with
little to no performance penalties on modern hardware. It is recommended to use
this mode when supported and where the GPU is not a bottleneck. On some weaker
devices, using this mode along with :ref:`force per pixel lighting` can carry
performance penalties.
Note that when enabled, groundcover lighting is forced to be vertex lighting,
unless normal maps are provided. This is due to some groundcover mods using the
Z-Up Normals technique to avoid some common issues with shading. As a
consequence, per pixel lighting would give undesirable results.
This setting has no effect if :ref:`force shaders` is 'false'.
light bounds multiplier
-----------------------
:Type:float
:Range:0.0-10.0
:Default:2.0
:Default:1.75
Controls the bounding sphere radius of point lights, which is used to determine if an object should receive lighting from a particular light source.
Note, this has no direct effect on the overall illumination of lights.
Larger multipliers will allow for smoother transitions of light sources, but may require an increase in :ref:`max lights` and thus carries a performance penalty.
This especially helps with abrupt light popping with handheld light sources such as torches and lanterns.
Controls the bounding sphere radius of point lights, which is used to determine
if an object should receive lighting from a particular light source. Note, this
has no direct effect on the overall illumination of lights. Larger multipliers
will allow for smoother transitions of light sources, but may require an
increase in :ref:`max lights` and thus carries a performance penalty. This
especially helps with abrupt light popping with handheld light sources such as
torches and lanterns.
It is recommended to keep this at 1.0 if :ref:`lighting method` is set to 'legacy', as the number of lights is fixed in that mode.
This setting has no effect if :ref:`lighting method` is 'legacy'.
maximum light distance
----------------------
@ -186,9 +205,11 @@ maximum light distance
:Range:The whole range of 32-bit floating point
:Default:8192
The maximum distance from the camera that lights will be illuminated, applies to both interiors and exteriors.
A lower distance will improve performance.
Set this to a non-positive value to disable fading.
The maximum distance from the camera that lights will be illuminated, applies to
both interiors and exteriors. A lower distance will improve performance. Set
this to a non-positive value to disable fading.
This setting has no effect if :ref:`lighting method` is 'legacy'.
light fade start
----------------
@ -199,18 +220,23 @@ light fade start
The fraction of the maximum distance at which lights will begin to fade away.
Tweaking it will make the transition proportionally more or less smooth.
This setting has no effect if the maximum light distance is non-positive.
This setting has no effect if the :ref:`maximum light distance` is non-positive
or :ref:`lighting method` is 'legacy'.
max lights
----------
:Type:integer
:Range:>=2
:Default:16
:Default:8
Sets the maximum number of lights that each object can receive lighting from.
Has no effect if :ref:`force shaders` option is off or :ref:`lighting method` is 'legacy'. In this case the maximum number of lights is fixed at 8.
Increasing this too much can cause significant performance loss, especially if :ref:`lighting method` is not set to 'experimental' or :ref:`force per pixel lighting` is on.
Increasing this too much can cause significant performance loss, especially if
:ref:`lighting method` is not set to 'shaders' or :ref:`force per pixel
lighting` is on.
This setting has no effect if :ref:`lighting method` is 'legacy'.
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