Rekod3DBuildings.Engine.prototype.createVertexShaderForSnowParticles = function( scriptId ) {
    if ( typeof scriptId === 'string' ) {
        var script = document.createElement( 'script' );
        script.id = scriptId;
        script.type = 'x-shader/x-vertex';
        script.textContent = '\
                attribute float size;\
                attribute float time;\
                attribute vec3 customColor;\
                uniform float globalTime;\
                varying vec3 vColor;\
                varying float fAlpha;\
                \
                void main() {\
                    vColor = customColor;\
                    vec3 pos = position;\
                    float localTime = time + globalTime;\
                    float modTime = mod( localTime, 1.0 );\
                    float accTime = modTime * modTime;\
                    pos.x += cos( modTime * 8.0 + ( position.z ) ) * 70.0;\
                    pos.z += sin( modTime * 6.0 + ( position.x ) ) * 100.0;\
                    fAlpha = ( pos.z ) / 1800.0;\
                    vec3 animated = vec3( pos.x, pos.y * accTime, pos.z );\
                    vec4 mvPosition = modelViewMatrix * vec4( animated, 1.0 );\
                    gl_PointSize = min( 150.0, size * ( 150.0 / length( mvPosition.xyz ) ) );\
                    gl_Position = projectionMatrix * mvPosition;\
                }';
        document.head.appendChild( script );
        return script;
    }
    else
        console.error( 'Script id for the vertex shader isn\'t a type of `string`.' );
};
Rekod3DBuildings.Engine.prototype.createFragmentShaderForSnowParticles = function( scriptId ) {
    if ( typeof scriptId === 'string' ) {
        var script = document.createElement( 'script' );
        script.id = scriptId;
        script.type = 'x-shader/x-fragment';
        script.textContent = '\
                uniform vec3 color;\
                uniform sampler2D texture;\
                varying vec3 vColor;\
                varying float fAlpha;\
                \
                void main() {\
                    gl_FragColor = vec4( color * vColor, fAlpha );\
                    gl_FragColor = gl_FragColor * texture2D( texture, gl_PointCoord );\
                }';
        document.head.appendChild( script );
        return script;
    }
    else
        console.error( 'Script id for the fragment shader isn\'t a type of `string`.' );
};