Ghost lights now officially supported in Iray

johndoe_36eb90b0

Iray documentation:

Ghost Lights

Daz Studio Private Build Channel:

• Update to NVIDIA Iray 2022.1.0 (363600.1229)
• Minimum driver is 526.67 (R525) on Windows
• Minimum driver is 526.98 (R525) on Windows in order to retain OpenCL/dForce compatibility
• Added support for controlling “Iray Ghost Light Factor” when NVIDIA Iray is the active renderer
  
  Experimental
  
  If a DzFloatProperty (user) property named “Iray Ghost Light Factor”, with the property group path of “Display/Rendering/Iray” and a default value of 1.0 is added to a node with geometry that is intended to act as a light source, the value of this property is used to control visibility in glossy interactions

DAZ Studio : Incremented build number to 4.21.1.21

 

Can't wait to test this.

Thanks to everyone in NVIDIA Iray team for finally seeing the light on this issue.

Thanks to Daz for working with NVIDIA to implement it so quickly even if it is still experimental.

johndoe_36eb90b0

Although this addresses the main complaint about luminosity * opacity bugfix, I don't see how it addresses the shadow part.

Consider a scene where a transparent emissive plane is placed above the room floor to get that "lighting from below" effect -- since it is transparent it doesn't cast shadow on the floor so the floor does not appear darker than the walls.

Making the floor emissive instead of using a ghost light which doesn't cast shadow would not achieve the same visual effect especially if bloom filter is enabled.