#line 2 //////////////////////////////////////   Available inputs// // Uniforms: constant across the whole surface// // float iGlobalTime;// vec3 iWorldScale;//// Varyings: Per-pixel attributes that change for every pixel// // vec3 _normal// vec4 _position// vec2 _texCoord0 // reserved for future use, currently always vec2(0)// vec3 _color // reserved for future user, currently always vec3(1)// ///////////////////////////////// //////////////////////////////////////   Available functions//// All GLSL functions from GLSL version 4.10 and usable in fragment shaders// See Page 8 of this document:  https://www.khronos.org/files/opengl41-quick-reference-card.pdf//// Additionally the snoise functions defined in WebGL-noise are available // See https://github.com/ashima/webgl-noise/tree/master/src// // float snoise(vec2)// float snoise(vec3)// float snoise(vec4)// // Fade from black to white and back againvec4 getProceduralColor() {    // set intensity to a sine wave with a frequency of 1 Hz    float intensity = sin(iGlobalTime * 3.14159 * 2.0);     // Raise the wave to move between 0 and 2    intensity += 1.0;        // Reducce the amplitude to between 0 and 1    intensity /= 2.0;        // Set the base color to blue    vec3 color = vec3(0.0, 0.0, 1.0);        // Multiply by the intensity    color *= intensity;     // return the color as a vec 4    return vec4(color, 1.0); }