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  • Create a spot light and a polygon plane. Point the spotlight at the plane. Increase the cone angle so that you can see the effect of the light. Press 7 (Lighting>Use All Lights) and enable High-Quality Rendering,in order to better visualize the spotlight in the viewport.

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  • In the attribute editor for the spotlight, scroll down to Arnold and under Light Filters, click on Add. A menu containing various Arnold light filters should appear. Click on Barndoor and then click Add. This will automatically make a connection between the spotlight and the Barndoor filter. You should now be able to see it in the Light Filter list. Double click on it in order to see its attributes in the attribute editor.

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  • Increase the Top Right to 0.2in order to match the Top Left value. Notice that the barn door effect is more prominent. A value of 1.0 for both Top Left and Right would completely obscure the spotlight, and we would not see any visible light effect.

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Center

Top Edge

 

  • The bottom values, however, start from 1.0. In order to To position them equally to the top flap reduce the Bottom Left and Bottom Right values to 0.8. Use the same value that we used for the Bottom edge, that we used for the Top Edge 0.05.

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  • We can control how much light appears on the left side of the screen using the left barn door. Increase the Left Top and Bottom values to 0.2.In order to To pull the light in even more, we could increase these values even further. However, however we we do not want a hard edge. Instead, we can increase the Left Edge to 0.1. This has the effect of gently graduating the light as it falls off.

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