Easy Compositing in 3ds Max Section 4: Add the truck’s shadow.
Step 1: Add a ground plane. To add a ground plane left click on the create panel and select the plane button. Drag the mouse in the top view to create a plane. Use the move tool to position the plane directly underneath the truck.
Step 2: Apply a Matte Shadow material to the Ground plane. To add a Matte Shadow, open the Material Editor (CTRL+M) and select Standard and then Matte Shadow. Next drag this onto the plane created in the previous step.
Step 3: Place a spotlight
Step 4: Turn on Shadows and Shadow Map (on the Modify panel with the light source selected).
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