In the diagram to the left, the area within the center ring receives full illumination. the light falls off between the inner ring (defined by the Cone Angle) and the outer ring (defined by the Cone Delta). The dashed line represents where illumination is half as bright as within the cone angle. The Cone Rolloff parameter moves this line between the center and outer rings.
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| No Cone Delta |
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| Cone Delta set to 20 |
- Cone Angle - (the inner ring) This parameter controls the diameter of the lights main beam. This value is in degrees calculated from the center.
- Cone Delta - (the outer ring) This is measured in degrees from the edge of the angle's radius (number of degrees of penumbra for spotlights). The delta controls the amount of falloff, and the higher the delta is the softer the edge of the light will appear.
- Cone Rolloff - (the dotted line) This parameter is basically a weighting exponent that can pull the falloff between the delta and the angle. It allows you to shape the falloff with more precision. By default it is set to 1, and this places it directly in the center of the outer and inner ring. The higher this value is the sharper your edge will be, and will pull it closer to the Cone Delta (outer ring).
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| Projection Map |
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| Near Clipping Plane |
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| Far Clipping Plane |
- Projection Map - Projection maps can be placed in this field, essentially turning your light into a projector. This can be used with gobos to filter out light in certain areas, and can also be used to create fake underwater caustic effects.
- Near Clipping - Similar to the camera's clipping plane, this parameter determines how close the projection map can be to the light
- Far Clipping - Also similar to the camera's clipping plane, this parameter determines how far from the light the projection map can be.
Pros:
- Falloff controls
- Directs light exactly where it is needed
- Efficient
Cons:
- Not as useful for lighting large areas
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