#version 100
precision highp int;
precision highp float;

uniform float time;
uniform float touchX;
uniform float touchY;
uniform float touchZ;
uniform float line;

varying float lightDiffuse;
varying vec4 vertexPos;

void main ()
{
  float zrises;
  float dist;
  vec4 c;

 float diff = lightDiffuse;
  if ( diff <0.0)
  {
     diff = 0.6;
  }
  float light = (1.0 - diff);
  vec3 lightColor = vec3(1.0,1.0,1.0);
  vec3 diffuse = lightColor*light;



  //c  = vec4(diffuse, 0.5);

  if ( line != 0.0 ) {

	  dist = distance( vertexPos, vec4( touchX / 10.0, touchY / 10.0, touchZ / 10.0, 1.0 ) );

	  float timeScaled = time * 4.5;
	  zrises = abs( dist/15.0 - timeScaled );   // distance to animated z coordinate
	  zrises = cos( zrises );
	  float fading = abs( 1.0 - zrises );
	  float fadingRatio = max( 1.0 - fading*20.0, 0.0 );

	  //c += fadingRatio * vec3( 0.0, 1.0, 1.0 );


  }
  gl_FragColor = vec4( diffuse.r, diffuse.g, diffuse.b, diffuse.g );

}