Environment

Method

For raytracing you can select from three methods:

• Indirect: Uses background color if ray doesn't intersect any geometry. This method is fine if you don't need HDRI environment. It uses existing global illumination rays (indirect lighting and reflection) and this is why this method is more efficient. However if you uses HDRI environment, the result image will be probably very noisy.
  
• Dome Light: Uses background color as light, so it is needed to trace shadow rays. This is useful for HDRI environment maps, but it is slower because many of shadow rays. Next benefit is, that you can't have enabled indirect lighting or reflections.
  
• Hybrid: This combine both methods. Depending on material is used combination of previous methods. This method is little slower than Indirect, but faster than Dome Light, but for correct results is needed to have enable reflections.
  

Background color

When using raytracing, background color can be used to light scene with environment color or HDR texture.

Note: When using background color with Diffuse weight or Glossy/Reflection weight, than default camera light would be disabled.

Background weight

Background color intensity. If this attribute is set to zero, camera background will be used as background color.

Scene lighted with just HDR map in Background color attribute.

Diffuse weight

Diffuse color intensity.

Glossy/Reflection weight

Specular color intensity.

Refraction weight

Transparency color intensity. If Background weight attribute is set to zero, camera background will be used as background color.

Dome Light Samples

Shadow rays samples for Dome Light or Hybrid method.

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