1991-2006 Silicon Graphics, Inc.
glSecondaryColor 3G
glSecondaryColor set the current secondary color

## C Specification

void `glSecondaryColor3b` GLbyte red GLbyte green GLbyte blue void `glSecondaryColor3s` GLshort red GLshort green GLshort blue void `glSecondaryColor3i` GLint red GLint green GLint blue void `glSecondaryColor3f` GLfloat red GLfloat green GLfloat blue void `glSecondaryColor3d` GLdouble red GLdouble green GLdouble blue void `glSecondaryColor3ub` GLubyte red GLubyte green GLubyte blue void `glSecondaryColor3us` GLushort red GLushort green GLushort blue void `glSecondaryColor3ui` GLuint red GLuint green GLuint blue

## Parameters

red
green
blue

  Specify new red, green, and blue values for the current secondary color.

## C Specification

void `glSecondaryColor3bv` const GLbyte * v void `glSecondaryColor3sv` const GLshort * v void `glSecondaryColor3iv` const GLint * v void `glSecondaryColor3fv` const GLfloat * v void `glSecondaryColor3dv` const GLdouble * v void `glSecondaryColor3ubv` const GLubyte * v void `glSecondaryColor3usv` const GLushort * v void `glSecondaryColor3uiv` const GLuint * v

## Parameters

v

  Specifies a pointer to an array that contains red, green, blue.

## Description

The GL stores both a primary four-valued RGBA color and a secondary four-valued RGBA color (where alpha is always set to 0.0) that is associated with every vertex.

The secondary color is interpolated and applied to each fragment during rasterization when `GL_COLOR_SUM` is enabled. When lighting is enabled, and `GL_SEPARATE_SPECULAR_COLOR` is specified, the value of the secondary color is assigned the value computed from the specular term of the lighting computation. Both the primary and secondary current colors are applied to each fragment, regardless of the state of `GL_COLOR_SUM`, under such conditions. When `GL_SEPARATE_SPECULAR_COLOR` is specified, the value returned from querying the current secondary color is undefined.

`glSecondaryColor3b`, `glSecondaryColor3s`, and `glSecondaryColor3i` take three signed byte, short, or long integers as arguments. When v is appended to the name, the color commands can take a pointer to an array of such values.

Color values are stored in floating-point format, with unspecified mantissa and exponent sizes. Unsigned integer color components, when specified, are linearly mapped to floating-point values such that the largest representable value maps to 1.0 (full intensity), and 0 maps to 0.0 (zero intensity). Signed integer color components, when specified, are linearly mapped to floating-point values such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0 . (Note that this mapping does not convert 0 precisely to 0.0). Floating-point values are mapped directly.

Neither floating-point nor signed integer values are clamped to the range 0 1 before the current color is updated. However, color components are clamped to this range before they are interpolated or written into a color buffer.

## Notes

`glSecondaryColor` is available only if the GL version is 1.4 or greater.

The initial value for the secondary color is (0, 0, 0, 0).

The secondary color can be updated at any time. In particular, `glSecondaryColor` can be called between a call to glBegin and the corresponding call to glEnd.

## Associated Gets

glGet with argument `GL_CURRENT_SECONDARY_COLOR`

glGet with argument `GL_RGBA_MODE`

glIsEnabled with argument `GL_COLOR_SUM`

## See Also

glColor, glIndex, glIsEnabled, glLightModel, `glSecondaryColorPointer`

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.