отображение нескольких источников света

проблема в том, что я передаю немного света шейдеру, но он показывает тень только для первого.
освещение применяется также для источников света, которые не видят их тени.
Я проверил карты теней, и они были переданы правильно.
фрагментный шейдер:

#version 420 compatibility
#define MAX_LIGHTS 8
struct lightSource
{
vec4 position;
vec4 diffuse;
vec4 specular;
float constantAttenuation, linearAttenuation, quadraticAttenuation;
float spotCutoff, spotExponent, intensity;
vec3 spotDirection;
sampler2D TexShadow;
samplerCube TexShadowPoint;
};
struct material
{
vec4 ambient;
vec4 diffuse;
vec4 specular;
float shininess;
};

uniform material frontMaterial;
uniform lightSource lights[MAX_LIGHTS];
uniform int numberOfLights;
uniform vec4 scene_ambient;
uniform mat4 inversedViewMatrix;
uniform sampler2D Tex;
uniform sampler2D TexNorm;

in vec4 position;  // position of the vertex (and fragment) in world space
in vec3 varyingNormalDirection;  // surface normal vector in world space
in vec2 ex_UV;
in vec4 ShadowCoords[MAX_LIGHTS];

vec2 poissonDisk[16] = vec2[](
vec2( -0.94201624, -0.39906216 ), vec2( 0.94558609, -0.76890725 ),
vec2( -0.094184101, -0.92938870 ), vec2( 0.34495938, 0.29387760 ),
vec2( -0.91588581, 0.45771432 ), vec2( -0.81544232, -0.87912464 ),
vec2( -0.38277543, 0.27676845 ), vec2( 0.97484398, 0.75648379 ),
vec2( 0.44323325, -0.97511554 ), vec2( 0.53742981, -0.47373420 ),
vec2( -0.26496911, -0.41893023 ), vec2( 0.79197514, 0.19090188 ),
vec2( -0.24188840, 0.99706507 ), vec2( -0.81409955, 0.91437590 ),
vec2( 0.19984126, 0.78641367 ), vec2( 0.14383161, -0.14100790 )
);
float rand(vec2 co)
{
return fract(sin(dot(co, vec2(12.9898, 78.233)) * 43758.5453));
}
float linstep(float low, float high, float v)
{
return clamp((v-low)/(high-low), 0.0, 1.0);
}
float VSM(sampler2D depths, vec2 uv, float compare)
{
vec2 moments = texture2D(depths, uv).xy;
float p = smoothstep(compare - 0.02, compare, moments.x);
float variance = max(moments.y - moments.x*moments.x, -0.001);
float d = compare - moments.x;
float p_max;
p_max = linstep(0.6, 1.0, variance / (variance + d*d));
return clamp(max(p, p_max), 0.0, 1.0) / 2;
}
void main(void)
{
vec3 normalDirection;
//sample the normal map and covert from 0:1 range to -1:1 range
if (texture2D(TexNorm, ex_UV).rgb != vec3(0.0, 0.0, 0.0))
{
vec3 mapped_Normals = texture2D(TexNorm, ex_UV).rgb * 2.0 - 1.0;
normalDirection = normalize(mapped_Normals); //normal mapped normals
}
else
normalDirection = normalize(varyingNormalDirection);
vec4 texColor = texture2D(Tex, ex_UV);// usual processing of texture coordinates

vec3 viewDirection = normalize(vec3(inversedViewMatrix * vec4(0.0, 0.0, 0.0, 1.0) -     position));
vec3 lightDirection;
float attenuation;
//initialize total lighting with ambient lighting
vec3 totalAmbientDiffuse = vec3(scene_ambient) * vec3(frontMaterial.ambient);
vec3 totalSpecular;
for (int index = 0; index < numberOfLights; index++) // for all light sources
{
float Visibility;
if (lights[index].position.w == 0.0) // directional light
{
attenuation = 1.0; // no attenuation
lightDirection = normalize(vec3(lights[index].position));
//int num = int(rand(position.xyz) * 16);
Visibility = VSM(lights[index].TexShadow, ShadowCoords[index].xy + poissonDisk[int(rand(position.xy + vec2(position.z,-position.z)) * 16)] /2000, ShadowCoords[index].z);
}
else // point light or spotlight (or other kind of light)
{
vec3 positionToLightSource = vec3(lights[index].position - position);
float Distance = length(positionToLightSource);
lightDirection = normalize(positionToLightSource);
attenuation = 1.0 / (lights[index].constantAttenuation + lights[index].linearAttenuation * Distance + lights[index].quadraticAttenuation * Distance * Distance);
if (lights[index].spotCutoff <= 90.0) // spotlight
{
Visibility = VSM(lights[index].TexShadow, ShadowCoords[index].xy / ShadowCoords[index].w + poissonDisk[int(rand(position.xy + vec2(position.z,-position.z)) * 16)] / 700, ShadowCoords[index].z / ShadowCoords[index].w);
float clampedCosine = max(0.0, dot(-lightDirection, normalize(lights[index].spotDirection)));
if (clampedCosine < cos(radians(lights[index].spotCutoff))) // outside of spotlight cone
{
attenuation = 0.0;
}
else
{
attenuation = attenuation * pow(clampedCosine, lights[index].spotExponent);
}
}
else // point light
{
//point light shadow calculations
}
}
vec3 diffuseReflection = attenuation * vec3(lights[index].diffuse) *     vec3(frontMaterial.diffuse) * max(0.0, dot(normalDirection, lightDirection));
vec3 specularReflection;
if (dot(normalDirection, lightDirection) < 0.0) // light source on the wrong side
{
specularReflection = vec3(0.0, 0.0, 0.0); // no specular reflection
}
else // light source on the right side
{
specularReflection = attenuation * vec3(lights[index].specular) * vec3(frontMaterial.specular)
* pow(max(0.0, dot(reflect(-lightDirection, normalDirection), viewDirection)), frontMaterial.shininess);
}
totalAmbientDiffuse += diffuseReflection * lights[index].intensity * Visibility;
totalSpecular += specularReflection * lights[index].intensity * Visibility;
}
gl_FragColor = vec4(totalAmbientDiffuse, 1.0) * texColor + vec4(totalSpecular, 1.0);
}