if PRO_MP_MASS<1.5
material_param("ptc_default_appearance")="材料外观中指定的颜色名称"
else
if PRO_MP_MASS>1.5&PRO_MP_MASS<2
material_param("ptc_default_appearance")="材料外观中指定的颜色名称"
else
if PRO_MP_MASS>2&PRO_MP_MASS<2.5
material_param("ptc_default_appearance")="材料外观中指定的颜色名称"
else
if PRO_MP_MASS>2.5&PRO_MP_MASS<3
material_param("ptc_default_appearance")="材料外观中指定的颜色名称"
else
if PRO_MP_MASS>3
material_param("ptc_default_appearance")="材料外观中指定的颜色名称"
else
endif
endif
endif
endif
endif