/usr/share/sdformat/1.2/light.sdf is in libsdformat1 1.4.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | <!-- Light -->
<element name="light" required="*">
<description>The light element describes a light source.</description>
<attribute name="name" type="string" default="__default__" required="0">
<description>A unique name for the light.</description>
</attribute>
<attribute name="type" type="string" default="point" required="1">
<description>The light type: point, directional, spot.</description>
</attribute>
<element name="cast_shadows" type="bool" default="false" required="0">
<description>When true, the light will cast shadows.</description>
</element>
<element name="pose" type="pose" default="0 0 0 0 0 0" required="0">
<description>A position and orientation in the global coordinate frame for the light.</description>
</element>
<element name="diffuse" type="color" default="1 1 1 1" required="1">
<description>Diffuse light color</description>
</element>
<element name="specular" type="color" default=".1 .1 .1 1" required="1">
<description>Specular light color</description>
</element>
<element name="attenuation" required="0">
<description>Light attenuation</description>
<element name="range" type="double" default="10" required="1">
<description>Range of the light</description>
</element>
<element name="linear" type="double" default="1" required="0">
<description>The linear attenuation factor: 1 means attenuate evenly over the distance.</description>
</element>
<element name="constant" type="double" default="1" required="0">
<description>The constant attenuation factor: 1.0 means never attenuate, 0.0 is complete attenutation.</description>
</element>
<element name="quadratic" type="double" default="0" required="0">
<description>The quadratic attenuation factor: adds a curvature to the attenuation.</description>
</element>
</element> <!-- End Attenuation -->
<element name="direction" type="vector3" default="0 0 -1" required="1">
<description>Direction of the light, only applicable for spot and directional lights.</description>
</element><!-- End Directional -->
<element name="spot" required="0">
<description>Spot light parameters</description>
<element name="inner_angle" type="double" default="0" required="1">
<description>Angle covered by the bright inner cone</description>
</element>
<element name="outer_angle" type="double" default="0" required="1">
<description>Angle covered by the outer cone</description>
</element>
<element name="falloff" type="double" default="0" required="1">
<description>The rate of falloff between the inner and outer cones. 1.0 means a linear falloff, less means slower falloff, higher means faster falloff.</description>
</element>
</element> <!-- End Spot -->
</element> <!-- End Light -->
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