How can I render my 3D car correctly?

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In Godot, if the same model has both “opaque parts” and “transparent parts”, for example, a car model where the window glass is transparent and the car body is opaque, how can it be correctly rendered (so that the transparency of the windows can be displayed and the car body can also cast a correct shadow on the ground)?

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The easy way of doing this is too divide/separate the model into different parts and asign each part it’s own material. Like one for body(opaque) and one for windows(transparent).

There is other way, which is more technical which is you need to bake the material into one which in sort of like merging both material into one. I have not tried this one approach but still it is a way used in high optimized studios. But honestly I recommend the first approach.

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Thank you for your help. Initially, I wanted to try to achieve this effect using only one shader, but I didn’t know exactly how to do it. Now, following your suggestion, I applied different materials to the glass and the car, and I have achieved the effect I wanted.