In the gif image below you can see the effect that my code produces. When I do not rotate the cube, diffuse lighting works properly (faces that face the light source are brighter) but when i rotate the cube this is what happens:
Cube's Vertex Shader.
#version 330 core
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aNormal;
uniform mat4 model;
uniform mat4 view;
uniform mat4 proj;
out vec3 FragPos;
out vec3 Normal;
void main()
{
gl_Position = proj * view * model * vec4(aPos, 1.0);
FragPos = vec3(model * vec4(aPos, 1.0));
Normal = normalize(aNormal);
}
Cube's Fragment Shader.
#version 330 core
out vec4 Color;
uniform vec3 lightPos;
uniform vec3 lightColor;
uniform vec3 objectColor;
in vec3 FragPos;
in vec3 Normal;
void main()
{
float ambient = 0.3f, diffuse;
vec3 result;
vec3 lightDirection = normalize(lightPos - FragPos);
diffuse = max( dot(Normal, lightDirection), 0.0f );
result = (ambient + diffuse) * lightColor;
Color = vec4(result * objectColor, 1.0f);
}
Cube's Bindings And Matrices Code (This code is called every frame for each cube object):
void Cube::Render()
{
//---------------------Run The Brains---------------------//
for (unsigned int i = 0; i < m_brains->size(); i++)
{
//Call the Start Method.
if (m_brains->at(i)->m_started)
{
m_brains->at(i)->Start();
m_brains->at(i)->m_started = false;
}
//Call the Update Method.
else
{
m_brains->at(i)->Update();
}
}
//---------------------Run The Brains---------------------//
//Bind everything before the draw call.
m_texture->Bind();
m_program->Bind();
//Initialize the mvp transformations.
glm::mat4 model = glm::mat4(1.0f);
glm::mat4 view = glm::mat4(1.0f);
glm::mat4 proj = glm::mat4(1.0f);
//Translate.
model = glm::translate(model, m_pos);
//Rotate the model.
model = glm::rotate(model, glm::radians(m_rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
model = glm::rotate(model, glm::radians(m_rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
model = glm::rotate(model, glm::radians(m_rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));
//Scale.
model = glm::scale(model, m_scale);
//View.
view = m_core->m_cam->GetView();
//Projection.
proj = glm::perspective(glm::radians(m_core->m_cam->m_fov), (float)m_core->m_width / m_core->m_height, 0.1f, 100.0f);
//Set the tranformation matrices on the shader.
m_program->SetUniformMat4f("model", model);
m_program->SetUniformMat4f("view", view);
m_program->SetUniformMat4f("proj", proj);
//Draw.
GLCall(glDrawArrays(GL_TRIANGLES, 0, 36));
}
Vertex Data:
float vertices[] = {
//Positions //Normals
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f
};
//Create the Vertex Array.
m_vao = new Vao();
//Create the Vertex Buffer.
m_vbo = new Vbo(vertices, sizeof(vertices));
//Create the attributes.
m_attributes = new VertexAttributes();
m_attributes->Push(3);
m_attributes->Push(3);
m_attributes->Commit(m_vbo);
