Headlights
This headlight shows a lighting situation that is not dealt with by a default light. This kind of headlight has a light bulb in its center that is then bounced off a highly reflective surface. This creates a spotlight effect where the beam of light emerges, not from o point, but from the face of the light fixture.
To achieve this effect in Mayo, you can use the Decoy Regions you learned about in the Light Effects section of this chapter. Put a spotlight behind the light fixture, then make sure that its first Decay Region hos no length and the second starts from the face of the fixture. This will create a solid beam of light that looks great with some light fog.
Default Lxcht
Here you con see thot o default spotlight rodiotes from the center of the light instead of from the fixture's front face.
Lxcht with Decay Regions
This image shows the use of Decay Regions to start the illuminotion from the face of the fixture. The light is actuolly behind the object.
Default Lxcht
Here you con see thot o default spotlight rodiotes from the center of the light instead of from the fixture's front face.
Decoy Regions
The light is positioned behind the fixture, with its Spotlight cone of light oligned with the edges of the fixture's front foce. The Decoy Regions control the light so that there is only illuminotion in front of the fixture. You could olso use on Intensity Curve for this, but the Decoy Region manipulators make it easier to set up.
Lxcht with Decay Regions
This image shows the use of Decay Regions to start the illuminotion from the face of the fixture. The light is actuolly behind the object.
Decoy Regions a—
Step 1: Original Scene
Here is 0 simple background set that is illuminated by o few lights. You con boke this lighting into a file texture so thot the lights con be removed to optimize render time. This is 0 way to optimize complex scenes ond is not required for the overoge Moyo rendering.
Step 2: Select tne Shading Group Node
Select the Moteriol node thot is ossigned to the surface you want to boke. Click on Show Downstream connections. Select the Shading Croup node and then press the Shift key ond select the surfoce. Select Edit > Convert to File Texture -options ond set Bake Shading Croup Lighting to On.
Step 3: Converted Textures
When you Convert to File Texture, you ore able to set 0 file texture size. Then Mayo bakes the complete shoding network into o single file texture. This file texture is mopped directly to a new Shading group thot hos been ossigned to the selected surface.
Step 4: Final Scene
With the resulting Shoding groups ond file textures, the scene renders the some os the originol but without requiring the lights. The perceived illuminotion is insteod created by the texture mops. Now you can focus on lighting your characters.
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