glLightModeli function
The glLightModeli function sets lighting model parameters.
Syntax
void WINAPI glLightModeli(
GLenum pname,
GLint param
);
Parameters
 pname

A singlevalued lighting model parameter. The following values are accepted.
 param

The value to which param will be set.
Return value
This function does not return a value.
Error codes
The following error codes can be retrieved by the glGetError function.
Name  Meaning 


pname was not an accepted value. 

The function was called between a call to glBegin and the corresponding call to glEnd. 
Error codes
The following error codes can be retrieved by the glGetError function.
Name  Meaning 


pname was not an accepted value. 

The function was called between a call to glBegin and the corresponding call to glEnd. 
Remarks
The glLightModeli function sets lighting model parameter. The pname parameter names a parameter and param gives the new value.the value or values of individual light source parameters.
In RGBA mode, the lighted color of a vertex is the sum of the material emission intensity, the product of the material ambient reflectance and the lighting model fullscene ambient intensity, and the contribution of each enabled light source. Each light source contributes the sum of three terms: ambient, diffuse, and specular.
 The ambient light source contribution is the product of the material ambient reflectance and the light's ambient intensity.
 The diffuse light source contribution is the product of the material diffuse reflectance, the light's diffuse intensity, and the dot product of the vertex's normal with the normalized vector from the vertex to the light source.
 The specular light source contribution is the product of the material specular reflectance, the light's specular intensity, and the dot product of the normalized vertextoeye and vertextolight vectors, raised to the power of the shininess of the material.
All three light source contributions are attenuated equally based on the distance from the vertex to the light source and on light source direction, spread exponent, and spread cutoff angle. All dot products are replaced with zero if they evaluate to a negative value.
The alpha component of the resulting lighted color is set to the alpha value of the material diffuse reflectance.
In colorindex mode, the value of the lighted index of a vertex ranges from the ambient to the specular values passed to glMaterial using GL_COLOR_INDEXES. Diffuse and specular coefficients, computed with a (.30, .59, .11) weighting of the light's colors, the shininess of the material, and the same reflection and attenuation equations as in the RGBA case, determine how much above ambient the resulting index is.
The following functions retrieve information related to the glLightModeli function:
glGet with argument GL_LIGHT_MODEL_LOCAL_VIEWER
glGet with argument GL_LIGHT_MODEL_TWO_SIDE
glIsEnabled with argument GL_LIGHTING
Requirements
Minimum supported client  Windows 2000 Professional [desktop apps only] 

Minimum supported server  Windows 2000 Server [desktop apps only] 
Header 

Library 

DLL 

See also