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Laila Sari,June 26, 2022 at 08:49 AM
Iray is rays, coming out of the camera and trying to ~randomly bounce off objects seeking a light source. So reverse from real light. When a path from camera, bounces that eventually connect with a light source, the path is reversed back doing exposure on the bounced objects and applying the shader instructions. rays that don’t connect with a light source are ignored and basically wasted processes. So the more light the more chances these bounces connect with a light source and hense more photo process take place per itteration and hense faster rendering.
This is why HDRI scenes are extremely fast in opposed to indoor lighting with point and spotlights.
So even though Iray can produce amazing image quality it’s pretty inefficient to other rendering mechanics.
Post edited by charles on June 24
Jun 26 2022
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