The following enhancements have been made to mesh lights:
• Caustics - mesh lights and cylinder lights can now generate caustics like other direct light types. Direct caustics need to be enabled in the Render Global Illumination settings, and caustics only show in final renders, where photon tracing is calculated.
• Use Prototype Transform - this new option allows you to position a mesh light item's light by positioning the prototype mesh item. This option is enabled by default, but scenes created in previous versions still load with this option disabled.
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