Unreal Material Utils

MaterialInstanceUtils.py

def getMaterialInstanceParameters(material_instance, parameters):
    param_names = []
    for param_info in parameters:
        str_name = str(param_info.parameter_info.name)
        if str_name:
            param_names.append(str_name)

    return param_names


def setMaterialInstanceParameter(material_instance, param_name, param_value):
    param_info = unreal.MaterialParameterInfo(name=unreal.Name(param_name), association=unreal.MaterialParameterAssociation.GLOBAL_PARAMETER, index=-1)

    if type(param_value) == float:
        parameters = material_instance.scalar_parameter_values
        parameter = unreal.ScalarParameterValue(parameter_info=param_info, parameter_value=param_value)
    if type(param_value) == unreal.LinearColor:
        parameters = material_instance.vector_parameter_values
        parameter = unreal.VectorParameterValue(parameter_info=param_info, parameter_value=param_value)
    if type(param_value) == unreal.Texture:
        parameters = material_instance.texture_parameter_values
        parameter = unreal.TextureParameterValue(parameter_info=param_info, parameter_value=param_value)

    parameter_names = getMaterialInstanceParameters(material_instance, parameters)

    if param_name not in parameter_names:
        #todo: check if the parameter exists in the parent material: parent_material = material_instance.parent.get_base_material()
        parameters.append(parameter)
    else:
        for i in range(len(parameters)):
            if parameters[i].parameter_info.name == param_name:
                new_params = parameters[i].copy() #struct copy
                new_params.parameter_value = param_value
                parameters[i] = new_params               

    return parameters