Opacity – Controls the weight of the layer. A value of 0 means no effect and a value of 1.0 means full effect.
Enable bloom/glare –Enables the V-Ray Lens Effects.
Size – Specifies the size of the filter as percentage of the image's diagonal. See the Size example below.
Intensity – Multiplier for the bloom/glare source bright pixels. Increasing the value can boost the effect by simulating up to 20 times brighter source. Values lower than 1 can be used to produce subtle bloom/glare from overbright sources.See the Intensity example below.
Bloom – Controls the blend between bloom and glare. A value of 1 forces bloom to be applied to full extent and without any glare. A value of 0 removes the bloom completely and applies only glare. Values in-between blend the two effects proportionally. See the Bloom/Glare example below.
Threshold – Sets a minimum value for the rendered pixels to be considered as lens effects source. The Bloom/Glare effect will be generated only regarding pixels with larger value than the specified threshold.
Rotation – Rotates the final result effect, regardless of this is a filter image or a procedurally created one.
Saturation – When the value is set 0, the effects use the original hue of the bright pixels to create bloom and glare. Larger values intensify the hue set with the Cold/Warm option. See the Cold/Warm & Saturation examples below.
Hardware Accelerated – Enable to calculate lens effects on the GPU. When multiple devices are present, V-Ray will prioritize the best one available.
Cold/Warm – When enabled, the Bloom/Glare effect will be toned to cold hues. When disabled, the effects will receive warm hue. The hue shift requires Saturation values larger than 0. See the Cold/Warm & Saturation examples below.
Interactive – When enabled, the bloom/Glare effect will be automatically recalculated and applied after any V-Ray lens effects parameter change.
Save Glare channel – When enabled, writes the glare channel to a file when writing all channels.
Update – Manually forces the recalculation of the bloom/glare effects.
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You can modify the frequency at which the lens effects are updated during progressive rendering via the Post effect rateparameter located in V-Ray's Settings > System rollout. Increase the value if you want to see the lens effects updated more often during IPR with V-Ray and V-Ray GPU. However, note that using large values is only useful in IPR and is not recommended for the final rendering.
