MarkerLess AR

Setup Vuforia Environment

Next,

Add Cube and Give Texture of Box,

Wooden Box

Next Step,

Same Way Create a car Assets 

For Shads 

Add Following Code to it : 

Link

Create A plane -> Place it Correctly 

Create a Material -> Property -> Shaders -> Custom -> Select Class 

Drag Material to Plane || Make Plane to child object of Object(Cube or Car)

You can change Shadow Density from Directional Light