基本的OpenGL照明问题

// 顶点着色器（传递法线和位置）
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
uniform mat4 model, view, projection;
out vec3 Normal, FragPos;

void main() {
    gl_Position = projection * view * model * vec4(aPos, 1.0);
    FragPos = vec3(model * vec4(aPos, 1.0));
    Normal = mat3(transpose(inverse(model))) * aNormal; // 处理非统一缩放
}

// 片段着色器（平行光+Phong）
uniform vec3 lightDir;      // 归一化的平行光方向
uniform vec3 lightColor;
uniform float ambientStrength;

void main() {
    vec3 ambient = ambientStrength * lightColor;
    vec3 diffuse = max(dot(normalize(Normal), -lightDir), 0.0) * lightColor;
    FragColor = vec4((ambient + diffuse) * objectColor, 1.0);
}