public void clearParam(String name) {
        checkSetParam(null, name);
        MatParam matParam = getParam(name);
        if (matParam == null) {
            return;
        }

        paramValues.remove(name);
        if (matParam instanceof MatParamTexture) {
            sortingId = -1;
        }
        if (technique != null) {
            technique.notifyParamChanged(name, null, null);
        }
    }
Clear a parameter from this material. The parameter must exist
@param name the name of the parameter to clear
jme3-core/src/main/java/com/jme3/material/Material.java