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This attribute gives the appearance that the material is emitting incandescent light.

Note that a Mesh Light may work better in a situation where you need an object to emit light that casts realistic ray-traced shadows.

Weight

Controls the amount of emitted light. It can create noise, especially if the source of indirect illumination is very small (e.g. light bulb geometry).

Note that a mesh_light may work better in a situation where you need an object to emit light that casts realistic ray-traced shadows.

Bulb with emissive shader assigned to it (rollover image)

Increasing the number of diffuse samples will help to reduce any noise in dark, indirectly lit areas of a scene when using emission.

Color

The emitted light color.

Texture map representing hot lava connected to emission_color

 

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