Translating Matriz in GLSL won't work with variables - opengl

Question

So... i made this mat4 matriz which would translate a triangle according to the coordinates. I realized that with the following matriz, the triangle would translate to the right of the screen:
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(0.5, 0.0, 0.0, 1.0);
Now, i read that a translating matriz in GLSL would look like this:
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(X, Y, Z, 1.0);
So therefore, i created a variable, which would contain these 3 values.
layout(location = 2) in vec3 CAM;
And i would do the following to establish the values in the corresponding places:
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(CAM.x, CAM.y, CAM.z, 1.0);
I thought that if CAM.x = 0.5 And CAM.y = 0.0, CAM.z = 0.0, i would have the same result as i had when i established manually X to be 0.5, and both Y and Z to be 0.0, since those are precisely the values of CAM. But rather, i got completely different results.
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(0.5, 0.0, 0.0, 1.0);
Gives me the following result:
And
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(CAM.x, CAM.y, CAM.z, 1.0);
gave me the following result:
Even though CAM.x = 0.5; CAM.y = 0.0; CAM.z = 0.0. (I checked it myself inside the vertex Shader by changing the red color of one of the vertices if the values of CAM were correct. By adding the following code: if(CAM.x == 0.5) ColorValue.x = 0.0; I got the following result: ). How can this be??
This is the whole Vertex Code by the way:
#version 330 core
layout(location = 0) in vec3 VertexPosition;
layout(location = 1) in vec3 COR;
layout(location = 2) in vec3 CAM;
out vec3 ColorValue;
void main(){
mat4 Camera;
Camera[0] = vec4(1.0, 0.0, 0.0, 0.0);
Camera[1] = vec4(0.0, 1.0, 0.0, 0.0);
Camera[2] = vec4(0.0, 0.0, 1.0, 0.0);
Camera[3] = vec4(CAM.x, 0.0, 0.0, 1.0);
vec4 point = vec4(VertexPosition.x, VertexPosition.y, VertexPosition.z, 1.0);
vec4 Transformed_Point = Camera * point;
gl_Position = Transformed_Point;
ColorValue.xyz = COR.xyz;
}

Answer 1

You are handling the camera position as a vertex attribute. That's why the first vertex is correctly shifted but the other two are at their original positions (because their camera attribute is zero). Use a uniform instead.