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ALS technical notes: Difference between revisions
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→Irradiance maps
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=== Irradiance maps === | === Irradiance maps === | ||
Note: This effect requires higher than minimum model shader quality setting. | <b>Note:</b> This effect requires higher than minimum model shader quality setting. | ||
In the simplest rendering schemes, diffuse and specular light are assumed to be highly directional (i.e. it illuminates lit surfaces only) while ambient light is taken to be omnidirectional. | In the simplest rendering schemes, diffuse and specular light are assumed to be highly directional (i.e. it illuminates lit surfaces only) while ambient light is taken to be omnidirectional. | ||
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The strength of the irradiance map regulates how pronounced the asymmetry of the map will be. A strength of zero always makes the light omnidirectional, whereas a strength of 1 implies that no light is coming from any direction 90 degree to the main direction (i.e. for the option 2, a strength of 1.0 means that no ambient light will fall in from above or below and that hence horizontal surfaces will appear pitch black unless direct light falls on them). | The strength of the irradiance map regulates how pronounced the asymmetry of the map will be. A strength of zero always makes the light omnidirectional, whereas a strength of 1 implies that no light is coming from any direction 90 degree to the main direction (i.e. for the option 2, a strength of 1.0 means that no ambient light will fall in from above or below and that hence horizontal surfaces will appear pitch black unless direct light falls on them). | ||
=== Explicit lightmap === | |||
<b>Note:</b> This effect requires higher than minimum model shader quality setting. | |||
In addition to the implicit lightmap, it is also possible to explicitly specify a lightmap. The syntax for this exactly parallels the syntax of the [[Model-combined_effect]] which supplies lightmaps for the exterior. | |||
For example | |||
<syntaxhighlight lang="xml"> | |||
<texture n="3"> | |||
<image>Aircraft/MyAircraft/Effects/my_lightmap.png</image> | |||
<type>2d</type> | |||
<filter>linear-mipmap-linear</filter> | |||
<wrap-s>clamp</wrap-s> | |||
<wrap-t>clamp</wrap-t> | |||
<internal-format>normalized</internal-format> | |||
</texture> | |||
<lightmap-enabled type="int">1</lightmap-enabled> | |||
<lightmap-multi type="int">0</lightmap-multi> | |||
<lightmap-factor type="float" n="0">1.0</lightmap-factor> | |||
<lightmap-color type="vec3d" n="0"> 1.0 1.0 1.0 </lightmap-color> | |||
</syntaxhighlight> | |||
sets up a single channel lightmap in which pixel color times the lightmap color provides the illumination. Using the multi-channel function, up to four different maps can be specified in which the (rgba) values of a pixel encode where the light falls and the associated lightmap color what color the illumination takes. Each of these maps can be switched on and off or dimmed in intensity independently. | |||
== ALS fuselage shadow effect == | == ALS fuselage shadow effect == | ||