GLSL variables not storing? - variables

Question

I am learning GLSL through Unity and I recently came across a problem involving the storing of variables.
Shader "Shader" {
Properties{
_Hole_Position("hole_Position", Vector) = (0., 0., 0., 1.0)
_Hole_EventHorizonDistance("hole_EventHorizonDistance", Float) = 1.0
_DebugValue("debugValue", Float) = 0.0
}
SubShader{
Pass{
GLSLPROGRAM
uniform mat4 _Object2World;
//Variables
varying float debugValue;
varying vec4 pos;
varying vec4 hole_Position;
varying float hole_EventHorizonDistance = 1;
#ifdef VERTEX
void main()
{
pos = _Object2World * gl_Vertex;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
#endif
#ifdef FRAGMENT
void main()
{
float dist = distance(vec4(pos.x, 0.0,pos.z, 1.0), vec4(hole_Position.x, 0.0, hole_Position.z, 1.0));
debugValue = dist;
if (dist < hole_EventHorizonDistance)
{
gl_FragColor = vec4(0.3, 0.3, 0.3, 1.0);
}
else
{
gl_FragColor = vec4(0.4, 0.6, 1.0, 1.0);
}
//gl_FragColor = vec4(hole_EventHorizonDistance, 0, 0, 1.0);
}
#endif
ENDGLSL
}
}
}
Now Hole_Position and EventHorizonDistance are changed from an outside C#-script with:
g.GetComponent<Renderer>().sharedMaterial.SetVector("_Hole_Position", new Vector4(transform.position.x, transform.position.y, transform.position.z, 1));
g.GetComponent<Renderer>().sharedMaterial.SetFloat("_Hole_EventHorizonDistance", 2);
this does not work as I intend it too (by changing the fragments color if its position is within 2 units from Hole_Position. However debugging with:
gl_FragColor = vec4(hole_EventHorizonDistance, 0, 0, 1.0);
seemingly suggests that EventHorizon is 0 at all times (the mesh tested on remains completely black), however debugging by getting and printing the variable from an outside (via
print(g.GetComponent<Renderer>().sharedMaterial.GetFloat("_Hole_EventHorizonDistance"));
) tells me EventHorizonDistance = 2. I cannot wrap my head around why this is the case, why is it so?