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This page provides information on the Lens Effects layer found in the V-Ray Frame Buffer.


Overview


V-Ray Lens Effects simulates real-world camera lens effects such as bloom and glare. The plug-in uses a fast multi-threaded technique to compute the result and provide immediate update in New V-Ray VFB.

V-Ray Lens Effects are applied in the RGB channel together with other post effects. When either a Denoiser render element is used or Source LightMix or Composite mode, then the lens effects are applied to the effectsResult channel.

The Lens Effects layer is accessible from the Layers panel in the new VFB and can be activated when the lens effects are enabled. It can be blended with the rest of the layers in the redesigned VFB.

V-Ray Lens Effects can also be refined via V-Ray Masks. For more information, see the Masks page.

Additionally, V-Ray includes a standalone Lens Effects Generator Tool for composing custom lens filters.

Lens Effects layer can be disabled from the visibility icon ().


Lens Effects controls


Enable bloom/glare effectEnables 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.

Update – Manually forces the recalculation of the bloom/glare effects.

Save Glare channel – When enabled, it writes the glare channel to a file when writing all channels.

Bake intensity – When enabled, the intensity is baked in the Glare channel. Otherwise, a default intensity of 1.0 is saved, so that it can be adjusted via post-processing.

Create effectsResult channel – When enabled, it generates an effectsResult channel without needing the Denoiser render element to be active. Otherwise, the lens effects are applied to the RGB channel instead.

You can modify the frequency at which the lens effects are updated during progressive rendering via the Post effect rate parameter 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.




Example: Size


Size = 1
Intensity (constant) = 1.00

Size = 10
Intensity (constant) = 1.00

Size = 20
Intensity (constant) = 1.00

Size = 30
Intensity (constant) = 1.00

Size = 40
Intensity (constant) = 1.00

Size = 50
Intensity (constant) = 1.00

Size = 60
Intensity (constant) = 1.00

Size = 70
Intensity (constant) = 1.00

Size = 80
Intensity (constant) = 1.00

Size = 90
Intensity (constant) = 1.00

Size = 100
Intensity (constant) = 1.00

1
100




Example: Bloom / Glare



Bloom = 0.0
Streak blur (constant) = 0.20

Bloom = 0.1
Streak blur (constant) = 0.20

Bloom = 0.2
Streak blur (constant) = 0.20

Bloom = 0.3
Streak blur (constant) = 0.20


Bloom = 0.4
Streak blur (constant) = 0.20


Bloom = 0.5
Streak blur (constant) = 0.20


Bloom = 0.6
Streak blur (constant) = 0.20


Bloom = 0.7
Streak blur (constant) = 0.20


Bloom = 0.8
Streak blur (constant) = 0.20


Bloom = 0.9
Streak blur (constant) = 0.20


Bloom = 1.0
Streak blur (constant) = 0.20

0.0
1.0





Example: Intensity



Intensity = 0
Size (constant) = 50

Intensity = 1
Size (constant) = 50

Intensity = 2
Size (constant) = 50

Intensity = 3
Size (constant) = 50


Intensity = 4
Size (constant) = 50


Intensity = 5
Size (constant) = 50


Intensity = 6
Size (constant) = 50


Intensity = 7
Size (constant) = 50


Intensity = 8
Size (constant) = 50


Intensity = 9
Size (constant) = 50


Intensity = 10
Size (constant) = 50

0
10





Example: Cold/Warm & Saturation


Saturation = 1.5
Cold/Warm On
Lights shaded with pure white color

Saturation = 1.0
Cold/Warm On
Lights shaded with pure white color

Saturation = 0.5
Cold/Warm On
Lights shaded with pure white color

Saturation = 0.0
Cold/Warm On
Lights shaded with pure white color

Saturation = 0.5
Cold/Warm Off
Lights shaded with pure white color

Saturation = 1.0
Cold/Warm Off
Lights shaded with pure white color

Saturation = 1.5
Cold/Warm Off
Lights shaded with pure white color

1.5
1.5



Aperture Shape


Clicking the  button displays a short menu that resets all the parameters for a lens effect to their default values.

Blades – Enables the Blades effect.

Sides – Sets custom camera aperture blades number to be considered for the lens effects. This parameter directly controls the number of "rays" of the glare.

Blades rotation  Controls the rotation of the camera aperture and blades.

Streak blur – Determines the width of the angle at which glare rays spread. The larger the value, the wider the spread. If set to 0, rays are directional; if set to 1, glare rays spread out and completely blend together. Observe in the Streak blur example below how values in-between change the glare rays appearance.

Peripheral grating – Enables grating along the sides of the aperture shape. 

Density – Controls the density of the grating effect in percent, where 100 is fully black.

Length – Controls the length of the grate lines.

Zoom – Controls the size of the halo around the lights.

Slope – Controls the direction of the lines.

Strength – Controls the strength of the blades effects.

Occlusion – When enabled it controls the aperture shape by occluding part of it.

Symmetric – Enables symmetric occlusion of the shape. When disabled, the occlusion appears only on one side of the shape.

Percent – Controls how much of the shape is occluded.

Rotation – Determines the position of the occlusion over the shape by rotation.

Arc – Controls the arc of the occlusion. A value of 0 sets a straight line, while a value of 100 makes an arc.






Example: Streak blur




Streak blur = 0.0
Bloom (constant) = 0

Streak blur = 0.1
Bloom (constant) = 0

Streak blur = 0.2
Bloom (constant) = 0

Streak blur = 0.3
Bloom (constant) = 0


Streak blur = 0.4
Bloom (constant) = 0


Streak blur = 0.5
Bloom (constant) = 0


Streak blur = 0.6
Bloom (constant) = 0


Streak blur = 0.7
Bloom (constant) = 0


Streak blur = 0.8
Bloom (constant) = 0


Streak blur = 0.9
Bloom (constant) = 0


Streak blur = 1.0
Bloom (constant) = 0

0.0
1.0



Lens Scratches


Lens scratches – Enables the lens scratches effect.

Pattern – Specifies RandomStripesSquare or Hexagonal type of pattern for the scratches.

Symmetric – When enabled creates symmetric pattern of the scratches. This option is available only when Pattern is Random.

Streaks – Specifies the number of streaks that are clustered together. If Symmetric is enabled, the streaks are stemming from one point with equal angles. If Symmetric is disabled, the streaks are scattered from random angles.

Density – Controls the density of the scratches effect in percent, where 100 is fully black.

Length – Controls the length of the scratches.

Slope variance – Randomizes the direction of the scratches.

Width variance – Randomizes the width of the scratches.

Seed – Specifies a seed parameter to introduce variance in the randomization.

Zoom – Controls the size of the pattern.

Rotation – Determines the position of the scratches by rotation.

Strength – Controls the strength of the effect.


Lens Dust


Lens dust – Enables the lens dust effect.

Pattern – Specifies the RandomSquare or Hexagonal type of pattern for the dust.

Density – Controls the density of the dust effect in percent, where 100 is fully black.

Radius variance – Specifies a variance in the radii of the dust dots. A value of 0 makes the dust dots uniform.

Jitter – Controls randomization of the position of the dots.

Zoom –  Controls the size of the dust dots.

Rotation – Determines the position of the dust dots by rotation.

Strength – Controls the strength of the effect.



Obstacle Image


Obstacle image – When enabled an obstacle image can be specified. You can use it to simulate various effects on the camera lens. See how this changes the lens effects in the Obstacle Image example below.

Path – Loads an obstacle image.

Zoom – Controls the size of the obstacle image. 

Rotation – Rotates the obstacle image. 

Strength – Controls the strength of the effect.





Example: Obstacle Images




Obstacle images used












Size (constant) = 50
Bloom (constant) = 0.5


Filter Image


Enabling this rollout disables the controls for the generated filter:

Filter image – Enables a filter image from the Filter generator tool to be used.

Path – Specifies the path to a filter kernel. You can create filters using the Filter generator tool which comes with the V-Ray for Maya installation.



Chromatic abberation



Chromatic aberration – Enables chromatic aberration.

Strength – Controls the strength of the effect. See the example below for more information on the effect. 



Example: Chromatic Aberration Strength

Depending on the Strength of the chromatic aberration, you can create different looks in your scene. You can imitate the effect of a real camera with subtle aberration, or, if you wish to achieve an artistic effect, consider increasing the Strength parameter, as in the example.


Strength = Off

Strength = 0.250

Strength = 0.500


Aperture Preview


The Aperture Preview panel is loaded by default, but can be minimized like the other Aperture groups. The aperture shape shows the result of the applied lens effects.


File Names of Saved Channels


As expected, channels will keep their names as displayed in the VFB when saving them to a single .vrimg or .exr file (using the Save all image channels to single file VFB button). The same channel names will be appended to the files when you use the VFB button Save all image channels to separate files.


Notes


  • When using Deadline for network rendering in combination with V-Ray Lens Effects, make sure to disable the Local Rendering option when submitting to Deadline. Otherwise, Deadline is not able to save your bloom/glare effects.