NAME

DoLightAttenuation − Create a light attribute object defining light intensity falloff with distance

SYNOPSIS

C:

DtObject DoLightAttenuation(c1, c2)
DtReal c1;
DtReal c2;

Fortran:

INTEGER∗4 DOLTA(C1, C2)
REAL∗8 C1
REAL∗8 C2

DESCRIPTION

DoLightAttenuation creates a light studio attribute object that defines a multiplicative factor modifying the light intensity as a function of the distance from the light source.  The parameters c1 and c2 are constants used to calculate this factor: attn = 1. / (c1 + c2∗distance) The DoLightAttenuation attribute defines the light attenuation for lights of type DcLightPointAttn <DCLTPA> and DcLightSpotAttn <DCLTSA>. 

ERRORS

DEFAULTS

The default DoLightAttenuation is  (1., 1.). 

SEE ALSO

DoLightSpreadAngles(3D), DoLightSpreadExp(3D) DoLightType(3D)

September 29, 2021