# Light Create

- Type
- Color
- Attenuation

### constant, linear, quadratic

Control the axial attenuation, defined only for positional and spot lights. The axial attenuation factor is defined as:

    Axial Attenuation Factor = 1/(constant + linear*distance + quadratic*distance*distance)

    Example: <light ... constant="1.0" linear="0.0" quadratic="0.0" radial="0.0"/> (default)
    (defined in GAMGI_MESA_LIGHT_CONSTANT, GAMGI_MESA_LIGHT_LINEAR,
    GAMGI_MESA_LIGHT_QUADRATIC and GAMGI_MESA_LIGHT_RADIAL)
    Allowed values: positive real (optional)

### radial

Controls the radial attenuation, defined only for spot lights. The radial attenuation factor is defined as:

    Radial Attenuation Factor = [max (0, vertex . direction)]**radial

    Example: <light ... constant="1.0" linear="0.0" quadratic="0.0" radial="0.0"/> (default)
    (defined in GAMGI_MESA_LIGHT_CONSTANT, GAMGI_MESA_LIGHT_LINEAR,
    GAMGI_MESA_LIGHT_QUADRATIC and GAMGI_MESA_LIGHT_RADIAL)
    Allowed values: positive real (optional)

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