问题：随着距离的增加，衰减不会降低光强度。
我的漫反射，镜面反射和环境反射看起来都有效。我添加了衰减变量的公式，然后将衰减乘以每个漫反射，镜面和环境。
这是地板照明的图片，灯光位于立方体后面：
img http://oi42.tinypic.com/28luzci.jpg
.vert
varying vec3 N;
varying vec3 v;
varying vec3 c;
varying float dist;
void main(void)
{
vec4 ecPos;
vec3 aux;
ecPos = gl_ModelViewMatrix * gl_Vertex;
aux = vec3(gl_LightSource[0].position-ecPos);
dist = length(aux);
c = vec3(gl_Color);
v = vec3(gl_ModelViewMatrix * gl_Vertex);
N = normalize(gl_NormalMatrix * gl_Normal);
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
.frag
varying vec3 N;
varying vec3 v;
varying vec3 c;
varying float dist;
void main (void)
{
float att;
att = 1.0 / (gl_LightSource[0].constantAttenuation +
gl_LightSource[0].linearAttenuation * dist +
gl_LightSource[0].quadraticAttenuation * dist * dist);
vec3 L = normalize(gl_LightSource[0].position.xyz - v);
vec3 E = normalize(-v); // we are in Eye Coordinates, so EyePos is (0,0,0)
vec3 R = normalize(-reflect(L,N));
float nDotL = max(dot(N,L), 0.0);
float rDotE = max(dot(R,E),0.0);
float power = pow(rDotE, gl_FrontMaterial.shininess);
//calculate Ambient Term:
vec4 Iamb = gl_FrontLightProduct[0].ambient * att;
//calculate Diffuse Term:
vec4 Idiff = gl_FrontLightProduct[0].diffuse * nDotL * att;
Idiff = clamp(Idiff, 0.0, 1.0);
// calculate Specular Term:
vec4 Ispec = gl_FrontLightProduct[0].specular * power * att;
Ispec = clamp(Ispec, 0.0, 1.0);
// write Total Color:
gl_FragColor = Iamb + Idiff + Ispec + c;
}
