OpenGL-制作跟随摄影机的点光源

我目前正在创建一个3D场景，我想知道创建跟随相机的点光源的最佳方法是什么。到目前为止，我的代码如下：

顶点着色器：

// Materials
uniform vec3 materialAmbient;
uniform vec3 materialDiffuse;
uniform vec3 materialSpecular;
uniform float materialShininess;
uniform float att_quadratic = 0.1;
// Lights
struct AMBIENT
{   
    vec3 color;
};
struct DIRECTIONAL
{   
    vec3 direction;
    vec3 diffuse;
};
struct POINT
{   int on;
    int frag;
    vec3 position;
    vec3 diffuse;
    vec3 specular;
};
uniform AMBIENT lightAmbient;
uniform DIRECTIONAL lightDir;
uniform POINT lightPoint1, lightPoint2, lightPoint3;
layout (location = 0) in vec3 aVertex;
layout (location = 2) in vec3 aNormal;
layout (location = 3) in vec2 aTexCoord;
// Output (sent to Fragment Shader)
out vec4 color;
out vec4 position;
out vec4 normal;
out vec2 texCoord;
out float gravelFactor;     // gravelFactor is 1 within the gravel circle and 0 outside the circle
vec4 compAmbient(vec3 material, AMBIENT light)
{
    return vec4(material * light.color, 1);
}
vec4 compDirectional(vec3 material, DIRECTIONAL light)
{
    vec3 L = normalize(mat3(matrixView) * light.direction).xyz;
    float NdotL = dot(normal.xyz, L);
    if (NdotL > 0)
        return vec4(light.diffuse * material * NdotL, 1);
    else
        return vec4(0, 0, 0, 1);
}
vec4 compPoint(vec3 materialDiffuse, vec3 materialSpecular, float materialShininess, POINT light)
{
    vec4 result = vec4(0, 0, 0, 1);
    // diffuse
    vec3 L = normalize(matrixView * vec4(light.position, 1) - position).xyz;
    float NdotL = dot(L, normal.xyz);
    if (NdotL > 0)
        result += vec4(light.diffuse * materialDiffuse, 1) * NdotL;
    // specular
    vec3 V = normalize(-position.xyz);
    vec3 R = reflect(-L, normal.xyz);
    float RdotV = dot(R, V);
    if (NdotL > 0 && RdotV > 0)
        result += vec4(light.specular * materialSpecular * pow(RdotV, materialShininess), 1);
    //attentuation
    float dist = length(matrixView * vec4(light.position, 1) - position); 
    float att = 1 / (att_quadratic * dist * dist); 
    return result * att;
}
void main(void) 
{
    // calculate position & normal
    position = matrixModelView * vec4(aVertex, 1.0);
    gl_Position = matrixProjection * position;
    normal = vec4(normalize(mat3(matrixModelView) * aNormal), 1);
    // calculate texture coordinate
    texCoord = aTexCoord;
    // calculate the colour
    color = vec4(0, 0, 0, 0);
    // ambient light
    color += compAmbient(materialAmbient, lightAmbient);
    // directional lights
    color += compDirectional(materialDiffuse, lightDir);
    // point lights
    if (lightPoint1.on == 1 && lightPoint1.frag == 0)
        color += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint1);
    if (lightPoint2.on == 1 && lightPoint2.frag == 0)
        color += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint2);
    if (lightPoint3.on == 1 && lightPoint3.frag == 0)
        color += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint3);
    // calculation of the gravelFactor:
    // 0 outside the 8-unit radius from the center
    // 1 within 7 units from the centre
    // between 0 and 1 at the border zone
    gravelFactor = clamp(-length(aVertex.xz) + 8, 0, 1);
}

片段着色器：

// input variables
in vec4 color;
in vec4 position;
in vec4 normal;
in vec2 texCoord;
in float gravelFactor;
// output variable
out vec4 outColor;
// uniforms - material parameters
uniform vec3 materialAmbient;
uniform vec3 materialDiffuse;
uniform vec3 materialSpecular;
uniform float materialShininess;
uniform float att_quadratic = 0.1;
// This uniform variable may be used to take different actions for the terrain and not-terrain
uniform int terrain;
// view matrix (needed for lighting)
uniform mat4 matrixView;
struct POINT
{   int on;
    int frag;
    vec3 position;
    vec3 diffuse;
    vec3 specular;
};
uniform POINT lightPoint1, lightPoint2, lightPoint3;
vec4 compPoint(vec3 materialDiffuse, vec3 materialSpecular, float materialShininess, POINT light)
{
    vec4 result = vec4(0, 0, 0, 1);
    // diffuse
    vec3 L = normalize(matrixView * vec4(light.position, 1) - position).xyz;
    float NdotL = dot(L, normal.xyz);
    if (NdotL > 0)
        result += vec4(light.diffuse * materialDiffuse, 1) * NdotL;
    // specular
    vec3 V = normalize(-position.xyz);
    vec3 R = reflect(-L, normal.xyz);
    float RdotV = dot(R, V);
    if (NdotL > 0 && RdotV > 0)
        result += vec4(light.specular * materialSpecular * pow(RdotV, materialShininess), 1);
    //attentuation
    float dist = length(matrixView * vec4(light.position, 1) - position); 
    float att = 1 / (att_quadratic * dist * dist); 
    return result * att;
}
// Texture Samplers
uniform sampler2D textureGrass;
uniform sampler2D textureGravel;
uniform sampler2D texture;
uniform sampler2D bumpmap;
uniform sampler2D textureNormal;
vec4 bump_normal = texture(textureNormal, texCoord.st) * 2 - 1; 
void main(void) 
{
    outColor = color;
    if (lightPoint1.on == 1 && lightPoint1.frag == 1)
        outColor += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint1);
    if (lightPoint2.on == 1 && lightPoint2.frag == 1)
        outColor += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint2);
    if (lightPoint3.on == 1 && lightPoint3.frag == 1)
        outColor += compPoint(materialDiffuse, materialSpecular, materialShininess, lightPoint3);
    if (terrain == 1)
    {
        // Rendering Terrain
        // Terrain is a mix of the Grass and Gravel texture
        outColor *= mix(texture(textureGrass, texCoord.st), texture(textureGravel, texCoord.st), gravelFactor);
    }
    else
    {
        outColor *= texture(texture, texCoord.st) + bump_normal;
    }
}

还有我的点灯声明：

//setup point light1
glUniform1i(glGetUniformLocation(idProg, "lightPoint1.on"), 1);
glUniform1i(glGetUniformLocation(idProg, "lightPoint1.frag"), 1);
glUniform3f(glGetUniformLocation(idProg, "lightPoint1.position"), 0, 3.1, 0.0);
glUniform3f(glGetUniformLocation(idProg, "lightPoint1.diffuse"), 1.0, 0.0, 0.0);
glUniform3f(glGetUniformLocation(idProg, "lightPoint1.specular"),  1.0, 0.0, 0.0);

解决这个问题的最佳方法是什么？应该在主代码中还是在着色器中更改灯光的位置？我怎么能这么做？