我将尝试在GLSL/OpenGL中实现非常简单的漫反射着色器。 以下是我所得到的: 顶点着色器:
#version 130
in vec3 vertPos3D;
in vec3 vertNormal3D;
uniform mat3 transpMatrix;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;
uniform vec3 lightPosition;
varying vec3 vertNormal;
varying vec3 lightVector;
void main()
{
vec4 res_pos = projectionMatrix * viewMatrix * vec4(vertPos3D.xyz, 1.0);
gl_Position = res_pos;
mat4 pm = projectionMatrix * viewMatrix;
vertNormal = (viewMatrix * vec4(vertNormal3D, 0)).xyz;
lightVector = (viewMatrix * vec4(lightPosition, 1.0)).xyz - (viewMatrix * vec4(vertPos3D.xyz, 1.0)).xyz;
}
片元着色器:
#version 130
out vec4 color;
varying vec3 lightVector;
varying vec3 vertNormal;
void main()
{
float dot_product = max(normalize(dot(lightVector, vertNormal)), 0.0);
color = dot_product * vec4( 1.0, 1.0, 1.0, 1.0 );
}
当我把最终颜色与点积相乘时,什么都不显示。如果我去掉点积,一切正常(除了漫反射光线)。我担心我错过了一些显而易见的东西。