ModelPart.opacity

Sets the opacity multiplier of this part
Note that opacity settings will only take effect if the part has a suitable Render Type for them, mainly TRANSLUCENT
Check out modelPart.setPrimaryRenderType() for how to do this

overload 1:
                        
models:opacity(opacity)  
 Method Property Fluent Description Representation
opacity accepts a Number Number 
   
Return Value a ModelPart ModelPart