NAME

cxGeoLightModelAdd - set the light model for the current geometry object

C SPECIFICATION

#include <cx/Geometry.h>

enum cxGeoLightModelType
{
 CX_GEO_LMODEL_BASE,
 CX_GEO_LMODEL_PHONG,
 CX_GEO_LMODEL_DEPTH
};

void cxGeoLightModelAdd(cxGeoLightModelType type,float *nearColor,float *farColor)

FORTRAN SPECIFICATION

integer CX_GEO_LMODEL_BASE
integer CX_GEO_LMODEL_PHONG
integer CX_GEO_LMODEL_DEPTH

parameter (CX_GEO_LMODEL_BASE = 0)
parameter (CX_GEO_LMODEL_PHONG = 1)
parameter (CX_GEO_LMODEL_DEPTH = 2)

subroutine cxGeoLightModelAdd(type,nearColor,farColor)
integer type
real nearColor(3)
real farColor(3)

PARAMETERS

type: The light model type - no lighting (BASE), regular lighting (PHONG), or depth cuing (DEPTH)
nearColor: The near color if the depth cueing lighting model is chosen.
farColor: The far color if the depth cueing lighting model is chosen.

DESCRIPTION

This function specifies the lighting model for the current geometry. In most cases, the default lighting environment will be acceptable. This call is provided for exceptions.

When normals are added to a geometry using cxGeoNormalAdd(3E), the lighting model is set to PHONG. This value may be overridden by calling this function.

KNOWN PROBLEMS

Setting the light model many times can make rendering inefficient. If there are many objects that need to be given a lighting model, it is best to group them together with cxGeoTransformPush(3E) and apply a single call to cxGeoLightModelAdd.

Last modified: May 26 14:00 1999
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