我为旋转的彩虹立方体制作了基本照明：
着色器：
attribute vec4 vPosition;
attribute vec4 vColor;
attribute vec4 vNormal;
varying vec4 color;
uniform mat4 ModelView;
uniform mat4 Projection;
uniform mat3 NormalMatrix;
uniform vec4 lPosition;
uniform vec4 lDiffuse;
uniform vec4 Shininess;
uniform vec4 lSpecular;
uniform vec4 lAmbient;
varying vec3 v_normal;
varying vec3 v_eye;
void main()
{
vec4 ambient, diffuse, specular;
vec3 N,L,E,H;
//gl_Position = projection * view * model * vPosition;
ambient = vColor*lAmbient;
N = normalize((ModelView*vNormal).xyz);
L = normalize((ModelView*lPosition).xyz - (ModelView*vPosition).xyz);
diffuse = max(dot(L,N), 0.0)*(vColor*lDiffuse);
E = -normalize((ModelView * vPosition).xyz);
H = normalize(L + E);
specular = max(pow(max(dot(N, H), 0.0), 20.0)
*lSpecular, 0.0);
color = vec4((ambient+diffuse+specular).rgb, 1.0);
gl_Position = Projection * ModelView * vPosition;
}
当立方体旋转时，我只能看到 2 面被着色，其余的都是黑色的。灯光始终处于同一位置（立方体的前面），但即使从一开始就被遮蔽的墙壁没有面向光源，也可以看到其余部分。建议？
// 编辑法线计算如下：
无效法线（int a，int b，int c，int d）{
vec4 U, V;
U = vertices[b] - vertices[a];
V = vertices[c] - vertices[a];
vec4 firstNormal;
firstNormal.x = (U.y * V.z)-(U.z * V.y);
firstNormal.y = (U.z * V.x)-(U.x * V.z);
firstNormal.z = (U.x * V.y)-(U.y * V.x);
firstNormal.w = 1.0f;
normal[normalCount] = firstNormal;
normalCount++;
vec4 X, Y;
X = vertices[c] - vertices[a];
Y = vertices[d] - vertices[a];
vec4 secondNormal;
secondNormal.x = (X.y * Y.z)-(X.z * Y.y);
secondNormal.y = (X.z * Y.x)-(X.x * Y.z);
secondNormal.z = (X.x * Y.y)-(X.y * Y.x);
secondNormal.w = 1.0f;
normal[normalCount] = secondNormal;
normalCount++;
}
它们发送到 vbo abcd 的位置是立方体边角上的顶点