Versions Compared

Old Version 3

changes.mady.by.user Unknown User (zheni.metodieva)

Saved on

compared with

New Version 4

changes.mady.by.user Lyubomira Toshkova

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

This page provides information about the Light Cache GI Engine in V-Ray for SketchUp.

 

Overview

...

Light caching (called "light mapping" in older versions of V-Ray) is a technique for approximating the global illumination in a scene. This method was developed originally by Chaos Group specifically for the V-Ray renderer. 

This rollout is available only if Light Cache has been chosen as either the Primary Rays or Secondary Rays GI engine in the Global Illumination Settings.

 

 

UI Path

 

...

||V-Ray Asset Editor|| >  Settings > Global >  Settings > Global Illumination > Light Cache

(When Light Cache is set as the Primary or Secondary Rays engine.)

...

Section
Column
width35%
 
Column
width30%
Before after
afterLabelon
darktrue
beforeLabeloff
Panel
borderStylenone

Panel
borderStylenone

Column
width35%
 

 

 

Disk Caching

...

Section
Column
width60%

Disk Caching rollout is available only in advanced mode of the Global Illumination rollout.

Mode – Controls the mode of the irradiance map:

Single Frame – When enabled, the last GI map calculated stays in memory after the rendering has finished
From file – When enabled, V-Ray does not compute the photon map but loads it from a file. Hit the Browse button on the right to specify the file name.

Keep File – When enabled V-Ray keeps the photon map in memory after the scene rendering has finished. When disabled, the map is deleted and the memory it took is freed. Enabling this option can be especially useful if you want to compute the photon map for a particular scene only once and then re-use it for further rendering.

Auto-Save File – When enabled, V-Ray automatically saves the caustics photon map to the provided file when rendering is completed. Specifies the file location where the caustics photon map is saved after rendering.

Column
width5%

 

Column
width35%

 

 

Notes

...

Fancy Bullets
typecircle
  • Do not apply perfectly white or near-white materials to the majority of the objects in the scene, as this will cause excessive render times. This is because the amount of reflected light in the scene will decrease very gradually and the light cache will have to trace longer paths. Also avoid materials that have one of their RGB components set to maximum (255) or above.
  • The Light Cache calculation cannot be distributed among several machines for distributed rendering.
  • When using Auto Exposure/Auto White Balance options of the camera, make sure to select Light Cache as a secondary GI engine. Light Cache Disk Caching mode is not supported, use the Single Frame mode instead.