Error: Unity Cannot Implicitly Convert Type

What's Causing This Error

The error "Unity cannot implicitly convert type" typically arises when you're trying to assign a value of one data type to a variable of another incompatible data type, without explicit casting. The C# compiler which Unity uses does not allow this because it can lead to loss of information or unexpected results.

For instance, if you try to store a float value into an int variable, you'll likely encounter this error since float (floating point number) can have decimal places which an int (integer) cannot handle.

Another common scenario is attempting to assign an object of one class to a variable of another class type. Unless the classes are related through inheritance and the source class is a subclass or implements the target class/interface, this operation will trigger the said error.

Solution - Here's How To Resolve It

Fixing this error involves ensuring that the data types of the variables in your assignments match, or if they don't, using explicit casting or conversion methods.

1. Check Data Types: Ensure that the data type of the variable you're assigning matches with the value being assigned. If you're working with numbers, both should either be integers, floats, doubles, etc.

2. Use Explicit Casting: If you need to convert between numerical types, like from float to int, you'll need to explicitly cast the value. For example, if num is a float, you'd use (int)num to convert it to an integer.

3. Convert Class Types Correctly: If the error is due to variable assignment between different class types, ensure that the classes are compatible. Use inheritance or interfaces to establish a relationship between classes if necessary. If ClassB is a subclass of ClassA, you can assign an object of ClassB to a variable of ClassA.

Remember, implicit conversions are only allowed when there's no risk of data loss or unexpected behavior. Otherwise, explicit casting is required.