cg1-visualisations/public/shaders/floor-fragment.glsl

precision mediump float;
varying vec3 vPosition;

void main() {
	gl_FragColor = mix(vec4(1,1,1,0.5), vec4(0.8,0.8,0.8,0.5), step(0.0, sin(vPosition.x * 3.14159 * 20.0) * sin(vPosition.z * 3.14159 * 20.0)));
}