uniform vec3 glowColor;
uniform float coeficient;
uniform float power;
uniform float glitch;

varying vec3 vVertexNormal;
varying vec3 vVertexWorldPosition;

void main() {
  vec3 worldCameraToVertex = vVertexWorldPosition - cameraPosition;
  vec3 viewCameraToVertex = (viewMatrix * vec4(worldCameraToVertex, 0.0)).xyz;
  viewCameraToVertex = normalize(viewCameraToVertex);
  float intensity =
      pow(coeficient + dot(vVertexNormal, viewCameraToVertex), power);

  gl_FragColor = vec4(glowColor, intensity * (1.0 - glitch));
}