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Mode – This group of controls allow the user to select the way the irradiance map is (re)used.

Bucket mode – A separate irradiance map is used for each rendered region ("bucket"). Note that since each bucket is computed independently of the others, there may be differences at the bucket edges. They can be reduced by using higher settings for the irradiance map (the High preset, more hemispheric subdivs and/or smaller Noise threshold for the DMC sampler).
Single frame
– The default mode; a single irradiance map is computed for the whole image, and a new irradiance map is computed for each frame. This is the mode to use when rendering animations of moving objects. In doing so one must make sure that the irradiance map is of sufficiently high quality to avoid flickering.
Multiframe incremental
– This mode is useful when rendering a sequence of frames (not necessarily consecutive) where only the camera moves around (so-called fly-through animations). V-Ray computes a new full-image irradiance map for the first rendered frame. For all other frames V-Ray tries to reuse and refine the irradiance map that has been computed so far.
From file
 – V-Ray loads the irradiance map from the supplied file at the start of the rendering sequence and uses this map for all the frames in the animation. No new irradiance map is computed. This mode can be used for fly-through animations and works well in network rendering mode.
Add to current map
 – V-Ray computes a completely new irradiance map and adds it to the map that is already in memory. This mode is useful when compiling an irradiance map to render multiple views of a static scene. Note that this mode is not supported for distributed rendering.
Incremental add to current map
– V-Ray uses the irradiance map that is already in memory and only refines it in places that don't have enough detail. This mode is useful when compiling an irradiance map to render multiple views of a static scene or a fly-through animation.
Bucket mode – A separate irradiance map is used for each rendered region ("bucket"). Note that since each bucket is computed independently of the others, there may be differences at the bucket edges. They can be reduced by using higher settings for the irradiance map (the High preset, more hemispheric subdivs and/or smaller Noise threshold for the DMC sampler). 
Animation (prepass)
 – V-Ray calculates irradiance maps to be used later on for final rendering with the Animation (rendering) mode. One irradiance map is created for each frame and written into a separate file. Note that in this mode you have to render one map for each frame (i.e. you cannot render every Nth frame). V-Ray automatically disables rendering of the final image in this mode - only irradiance map prepasses are calculated.
Animation (rendering)
– V-Ray renders a final animation using irradiance maps created with the Animation (prepass) mode. Irradiance maps from several adjacent frames are loaded together and blended so as to reduce flickering. The number of irradiance maps that are interpolated is determined by the Interp. frames parameter.

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