Grass procedural texture can be found here:
A demo can be found here: https://www.babylonjs-playground.com/#KM3TC#1 -
This texture has 2 parameters :
var grassMaterial = new BABYLON.StandardMaterial(name + "bawl", scene);
var grassTexture = new BABYLON.GrassProceduralTexture(name + "textbawl", 256, scene);
grassMaterial.ambientTexture = grassTexture;