Corona includes its ownVirtual Frame Buffer (VFB)window and interface that has been tuned to the most common needs of artists and can provide a very decent post-production experience and results.
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The Corona VFB 2.0 is only available starting from Corona 12; older Corona versions use the Corona VFB (legacy)
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Starting from Corona 12, the VFB 2.0 is the default Virtual Frame Buffer.
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Switching from VFB 2.0 to Legacy VFB
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Post Tab
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Saves current postprocessing settings into a file.
Loads postprocessing settings from a specified file.
Auto Adjustment
Exposure – Calculates optimal exposure based on rendered values without tone mapping. To see what exposure values is generated, remove exposure operator(s) in tone mapping and bake auto exposure into tone mapping.
White balance – Calculates optimal white balance based on rendered values without tone mapping. Bake to see the generated valueAuto Exposure in VFB 2.0 automatically adjusts the brightness of your render. Instead of manually changing settings like ISO, f-stop, and shutter speed yourself, Corona looks at the lighting in your scene and adjusts these values for a balanced exposure. The strength of this effect can be controlled by the value of the slider. It can also be applied to the Simple Exposure operator in the Tone Mapping rollout using the Bake button.White balance – Auto White Balance corrects the color temperature in your scene. It automatically adjusts to remove unwanted color tints, making sure colors look more natural no matter the lighting. The strength of this effect can be controlled by the value of the slider. It can also be applied to the White Balance operator in the Tone Mapping rollout using the Bake button.
Update during animation – This option updates the enabled Auto adjustmentIf enabled, auto adjustments are calculated for each frame of the animation. This feature is especially helpful when the camera moves into a brighter area, such as from an indoor scene to a bright outdoor scenesequence rendering. When disabled, auto adjustments are calculated only for the first frame of the sequence and stay unchanged.
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Click here to see the Auto Adjustment's UI...
Tone Mapping
The Tone Mapping rollout lists the currentlyadded Tone Mapping Operators. By default, it includes the following operators:
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Simple Exposure
White Balance
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Starting from Corona 12 Update 1, the White Balance operator has been deprecated and is now called "Legacy White Balance." The new White Balance operator uses Bradford's chromatic adaptation formula, which makes it more accurate and in-line with industry standard.
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"+" button – – Displays the list of all available Tone Mapping Operators and allows to add one.
Reset button – Resets the current Tone Mapping Operators stack to the default configuration.
Presets button – Displays the list of built-in tone mapping presets.
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Bloom & Glare
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Compute After Render – Enabling this checkbox allows –If enabled, the Bloom & and Glare effect to be computed only after the image rendered is completeis computed at the end of the rendering process, instead of during the whole rendering.
Threshold – Controls the minimum brightness which is considered for the Bloom & Glare effect. Increasing the threshold applies Bloom & Glare only to the brighter pixels. Reducing it allows the Bloom & Glare effect to be applied to pixels that are less bright.
Color Intensity – Controls how saturated the Bloom & Glare effect is. Higher values mean higher saturation.
Color Shift – Changes the hue of the coloring added to the Bloom & Glare effect.
Streak Count – Defines the number of streaks for the glare effect.
Rotation – Rotation of the glare effect in degrees.
Streak Blur – Decides whether the glare streaks should be sharper or more blurry.
Custom aperture – Enabling this checkbox allows the use of the Editor button to fine-tune advanced Bloom & Glare options.
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Click here to see the Custom Aperture Editor UI:
Sides– Sets the number of aperture blades used for custom aperture. When disabled, the circular aperture is used instead.
Rotation– Rotation in bladed aperture in degrees.
Streak Blur– Controls the blurring of the glare streak perpendicular to the streak direction.
Occlusion– Enables occlusion of part of aperture shape.
Ratio– Controls ratio of the aperture being occluded, with the minimum value meaning no occlusion and the maximum value meaning full occlusion.
Rotation– Controls the rotation of the occlusion in the degrees.
Arc– The arc of occlusion with the minimum value being straight line and the maximum value being full arc.
Symmetric– When enabled, occlusion is applied symmetrically from both sides of the aperture.
Reset all– Resets the setting to default value.
Peripheral Grating– Enables grating along the sides of the aperture shape.
Lens Scratches– Simulates scratches over the lens. Regular scratches can create additional glare effect, while irregular ones will effect shape and blur of existing glare effect.
Lens Dust– Simulates dust particles over the lens. Dust can create effect similar to bloom that is affected by overall pattern of generated particles.
