我遇到了法线贴图问题。我在通过 ASSIMP 库加载的每个模型上都有一个纹理和一个普通纹理。我在 ASSIMP 库的帮助下计算每个对象上的切向量，所以这些应该没问题。这些对象与法线贴图完美配合，但是一旦我开始平移其中一个对象（从而通过平移影响模型矩阵），照明就会失败。正如您在图像中看到的那样，地板（沿 y 轴平移）似乎失去了大部分漫反射光照，并且其镜面光照方向错误（它应该在灯泡和玩家位置之间）
它可能与正常矩阵有关（尽管应该丢失翻译），也可能与着色器中使用的错误矩阵有关。我没有想法，希望你能对这个问题有所了解。
顶点着色器：
#version 330
layout(location = 0) in vec3 position;
layout(location = 1) in vec3 normal;
layout(location = 2) in vec3 tangent;
layout(location = 3) in vec3 color;
layout(location = 4) in vec2 texCoord;
// fragment pass through
out vec3 Position;
out vec3 Normal;
out vec3 Tangent;
out vec3 Color;
out vec2 TexCoord;
out vec3 TangentSurface2Light;
out vec3 TangentSurface2View;
uniform vec3 lightPos;
uniform vec3 playerPos;
// vertex transformation
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
mat3 normalMatrix = mat3(transpose(inverse(model)));
Position = vec3(model * vec4(position, 1.0));
Normal = normalMatrix * normal;
Tangent = tangent;
Color = color;
TexCoord = texCoord;
gl_Position = projection * view * model * vec4(position, 1.0);
// Calculate tangent matrix and calculate fragment bump mapping coord space.
vec3 light = lightPos;
vec3 n = normalize(normalMatrix * normal);
vec3 t = normalize(normalMatrix * tangent);
vec3 b = cross(n, t);
// create matrix for tangent (from vertex to tangent-space)
mat3 mat = mat3(t.x, b.x ,n.x, t.y, b.y ,n.y, t.z, b.z ,n.z);
vec3 vector = normalize(light - Position);
TangentSurface2Light = mat * vector;
vector = normalize(playerPos - Position);
TangentSurface2View = mat * vector;
}
片段着色器
#version 330
in vec3 Position;
in vec3 Normal;
in vec3 Tangent;
in vec3 Color;
in vec2 TexCoord;
in vec3 TangentSurface2Light;
in vec3 TangentSurface2View;
out vec4 outColor;
uniform vec3 lightPos;
uniform vec3 playerPos;
uniform mat4 view;
uniform sampler2D texture0;
uniform sampler2D texture_normal; // normal
uniform float repeatFactor = 1;
void main()
{
vec4 texColor = texture(texture0, TexCoord * repeatFactor);
vec4 matColor = vec4(Color, 1.0);
vec3 light = vec3(vec4(lightPos, 1.0));
float dist = length(light - Position);
// float att = 1.0 / (1.0 + 0.01 * dist + 0.001 * dist * dist);
float att = 1.0;
// Ambient
vec4 ambient = vec4(0.2);
// Diffuse
// vec3 surface2light = normalize(light - Position);
vec3 surface2light = normalize(TangentSurface2Light);
// vec3 norm = normalize(Normal);
vec3 norm = normalize(texture(texture_normal, TexCoord * repeatFactor).xyz * 2.0 - 1.0);
float contribution = max(dot(norm, surface2light), 0.0);
vec4 diffuse = contribution * vec4(0.6);
// Specular
// vec3 surf2view = normalize(-Position); // Player is always at position 0
vec3 surf2view = normalize(TangentSurface2View);
vec3 reflection = reflect(-surface2light, norm); // reflection vector
float specContribution = pow(max(dot(surf2view, reflection), 0.0), 32);
vec4 specular = vec4(1.0) * specContribution;
outColor = (ambient + (diffuse * att)+ (specular * pow(att, 3))) * texColor;
// outColor = vec4(Color, 1.0) * texture(texture0, TexCoord);
}
编辑
编辑着色器代码以计算世界空间中的所有内容，而不是在世界和相机空间之间进行乒乓球（更容易理解且不易出错）。