我有一个UBO初始化如下：

glGenBuffers(1, &sphereUBO);
glBindBuffer(GL_UNIFORM_BUFFER, sphereUBO);
glBufferData(GL_UNIFORM_BUFFER, sizeof(SphereUBO) * sphereData.size(), nullptr, GL_DYNAMIC_DRAW);
glBindBufferBase(GL_UNIFORM_BUFFER, 0, sphereUBO);

glUniformBlockBinding(rtShader.ID, glGetUniformBlockIndex(shaderProgram, "Spheres"), 0);

rtShader.setInt("u_numSpheres", sphereData.size());

在此之上，我初始化我的球体数据如下：

Scene scene = Scene();
scene.addSphere(glm::vec3(-1.0, 1.0, -1.0), 1.0);
scene.addSphere(glm::vec3(0.0, 1.0, 0.0), 0.1);
scene.addSphere(glm::vec3(5.0, 0.5, 0.0), 0.5);
scene.addSphere(glm::vec3(5.0, 3.5, 0.0), 0.75);

std::vector<SphereUBO> sphereData;
for (int i = 0; i < scene.spheres.size(); i++) {
    SphereUBO sphere;
    sphere.position = scene.spheres[i].position;
    sphere.radius = scene.spheres[i].radius;
    sphere.albedo = glm::vec3(scene.spheres[i].material.albedo[0], scene.spheres[i].material.albedo[1], scene.spheres[i].material.albedo[2]);
    sphereData.push_back(sphere);
}

我已经打印出sphereData以确保数据正确传递。最后，我更新了缓冲区的内容：

glBindBuffer(GL_UNIFORM_BUFFER, sphereUBO);
glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(SphereUBO) * sphereData.size(), sphereData.data());

但是，我只看到一个渲染的球体！我已经确认了所有的球体都在渲染，但它们在某种程度上都是一样的。我在我的片段着色器中有这个函数：

bool raycast(Ray ray, out HitPoint hitPoint) {
    bool hit = false;
    float minHitDistance = 10000;
    float hitDistance;

    for (int i = 0; i < u_numSpheres; i++) {
        if (sphereIntersection(u_spheres[i].position, u_spheres[i].radius, ray, hitDistance)) {
            hit = true;

            if (hitDistance < minHitDistance) {
                minHitDistance = hitDistance;
                hitPoint.position = ray.origin + ray.direction * minHitDistance;
                hitPoint.normal = normalize(hitPoint.position - u_spheres[i].position);
                hitPoint.material = Material(u_spheres[i].albedo);
            }
        }
    }

return hit;

}
我知道它们都是一样的，因为当我不做for循环，只检查第一个或第二个球体时，它们的渲染结果是一样的。
我有我的缓冲/制服声明在这里：

uniform int u_numSpheres;

layout(std140) uniform Sphere{
    vec3 position;
    float radius;
    vec3 albedo;
} u_spheres[32];