skein/vert.glsl

#version 330 core

layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;

uniform mat4x4 _Model;
uniform mat4x4 _View;
uniform mat4x4 _Projection;

out vec3 Normal;
out vec3 FragPos;
out mat4x4 ModelViewProjection;

void main()
{
    vec4 pos = vec4(aPos, 1.0);
    mat4x4 mvp = _Projection * _View * _Model;
    ModelViewProjection = mvp;

    gl_Position = mvp * pos;
    FragPos = vec3(_Model * pos);

    // Convert the normal from model to world space
    mat3 normalMatrix = mat3(mvp);
    normalMatrix = inverse(normalMatrix);
    normalMatrix = transpose(normalMatrix);
    Normal = normalize(normalMatrix * aNormal);
    //Normal = normalize(_Model * aNormal);
}