Adding Barn Doors
Maya 2012 Tutorial
How to Add Light Barn Doors in Maya
The Barn Doors can be added to spot lights to reshape the light. The clip the edges of the round spot light shape to form a rectangle or square. This technique may be helpful to simulate light from a door crack or other rectangular shape.
Add a plane to the scene by choosing Create > Polygon Primitives > Plane.
Add a spot light by choosing Create > Lights > Spot Light.
Position the light above the plane so it illuminates the top face of the plane.
With the light selected, open the Attribute Editor. and increase the Cone Angle to 90.
Open the Light Effects section and select the Barn Doors checkbox.
Click the IPR Render icon and drag a marquee in the rendered image to specify a real time render area.
Change the Barn Door values to reshape your light.