public void setShapeType(AreaShape shapeType) {
        this.shapeType = shapeType;
        if (material != null) {
            material.setBoolean("SquareArea", shapeType==AreaShape.Square);
        }
    }
Set the shape of the water area (Circular (default) or Square).
if the shape is square the radius is considered as an extent.
@param shapeType the shape type
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java