# Light Modify

- Geometry
- Color
- Attenuation

Change here the attenuation parameters for a single light or a list of lights.

To modify a light, click over the graphic area to open a menu and choose a light, or write its identification (name and number) on the Light entry. To modify a list of lights, press the button List (after creating the list of lights with Light->Select). Parameters for empty entries or Local choices remain unchanged.

To change a light name write the new name in the Light entry, followed by the light number (GAMGI needs the number to identify the light). To change the name for a list of lights, press List first and then write the new common name in the Name entry.

### Axial

Change the Constant, Linear, Quadratic parameters that control the axial attenuation. This is defined only for positional and spot lights. The axial attenuation factor is given by:

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

### Radial

Change the radial attenuation, defined only for spot lights. The radial attenuation factor is given by:

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

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