Corona VFB 2.0

Corona includes its own Virtual 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.

It is possible to switch from the new VFB 2.0 to the Legacy VFB. Here is how to do it:

Auto Adjustment

Exposure – Auto 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 adjustment 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 scene.

Tone Mapping

The Tone Mapping rollout lists the currently added Tone Mapping Operators. By default, it includes the following operators:

"+" 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.

Bloom & Glare

Compute After Render – Enabling this checkbox allows the Bloom & Glare effect to be computed only after the image rendered is complete.

Size – Increases/decreases Bloom & Glare size.

Bloom Intensity – Increases/decreases bloom intensity.

Glare Intensity – Increases/decreases glare intensity.

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. 

Sharpening & Blurring

Sharpening Amount – The value that is used to control sharpening.

Sharpening Radius – Defines the sharpness radius.

Blurring Radius – Defines the radius of blur.

Denoising

Denoise amount – The main value that is used to control denoising. It blends between the original (noisy) image and the fully denoised version of the image, where 0 is the original image, and 1 is the purely denoised version.

Times

Scene parsing – How long it took to get the data from the native application format to the internal Corona format. Excessive times (more than a few seconds or tens of seconds for complex scenes) can be caused by running out of RAM, using slow network drives, complex scatters and geometry models, etc.

Geometry – How long it took Corona to prepare the geometry for rendering. This includes computing displacement, building, and acceleration structure, and preparing the lights for sampling. Excessive times (more than a few seconds or tens of seconds for complex scenes) are most often caused by using too detailed displacement, using too many textured lights, or running out of memory.

UHD cache precomp – How long it took to calculate UHD cache. The time depends on resolution, scene complexity, and UHD cache settings (the animation preset calculates significantly longer, but it does not flicker in animation).

Rendering – Total elapsed rendering time.

Denoising – How long the denoising took. Denoising is optionally computed after rendering. Its running time is dependent only on resolution (number of pixels) and the number of render elements to be denoised - it has to run from scratch for each element.

Estimated remaining – If any render limit is set (time, passes, or noise level), Corona computes the best possible time estimate. If no limits are set, '—' is shown, and the user has to stop the render manually.

TOTAL elapsed – the total elapsed rendering time.

Scene

Primitives unique – Numbers of unique (non-instanced) primitives in the scene. Primitive means a single triangle, hair strand, etc. Each such primitive is stored in the memory, so this number is directly proportional to the RAM usage (1 primitive takes up about 200 Bytes).

Primitives displac. – The number of unique (non-instanced) micro triangles created by displacement in the scene. Each such object takes a certain amount of memory but is generally an order of magnitude smaller than regular triangles.

Primitives inst. – The number of primitives in the scene after instancing allows storing a single object in the memory just once and placing it into the scene multiple times with almost no additional memory usage. This is extremely useful e.g. for forests, grass, etc.

Geometry groups – The number of unique geometry groups in the scene. One geometry group roughly corresponds to one separate mesh/object in the source scene, not counting instanced meshes. This number does not significantly influence the performance/memory usage, with a single exception; high values (thousands and more) can slow down the preprocessing phase.

Instances – Number of geometry groups in the scene after instancing is applied. Each instance takes about 1000 Bytes of memory.

Lights (groups) – The first value is the total number of light-emitting primitives in the scene and the second value is the number of instances that contain these primitives. High values usually mean a scene with complex illumination, where slower rendering is to be expected. Only true light emission counts - neither self-illumination, nor Light material with Emit light off count.

UHD Cache

Records – Numbers of discrete points in the scene for which the illumination is computed during preprocessing and which are used for the interpolation during rendering. Complex scenes and animations, where higher precision is required, cause this number to increase, which in turn makes the precalculation slower.

Success rate – The percentage of rays that were accelerated using the cache. This is the effectiveness of the cache, e.g. 70% meaning that 7 out of each 10 rays were accelerated. The higher this number, the faster is the rendering as more rays are accelerated.

Performance

Passes total – The total number of passes computed. One pass in Corona means that each pixel received on average 1 sample. The number of passes directly influences the quality of antialiasing, the depth of field, and the motion blur effects. Smaller images accumulate passes faster as there are fewer pixels to process. Also if Rays/sample is too high, then too much work is spent per pixel, causing the number of passes to stay low, which slows down the antialiasing/depth of field/motion blur computation. A limit for the number of passes can be set in render settings.

Noise level – An estimate of the remaining noise level in the image. A limit for the noise level can be set in render settings. Around 2% is usually being enough for the final images, 5% for the final images with denoising, and anything higher than that being suitable for the previews.

Rays/s total – The average number of rays computed per second since the render started. Rays/s is a measure of the brute force computation power of the renderer. Comparing rays/s between different machines is a good way to compare their CPU performance. The number is also higher in simple scenes when using simple materials. Too low of a number (lower than usual for the machine) can be due to problems with CPU overheating, running out of RAM, other CPU utilization problems, or just having too complex materials/shaders.

Rays/s actual – Number of rays computed in the last second. Rays/s is a measure of the brute force computation power of the renderer. Comparing rays/s between different machines is a good way to compare their CPU performance. The number is also higher in simple scenes when using simple materials. Too low of a number (lower than usual for the machine) can be due to problems with CPU overheating, running out of RAM, other CPU utilization problems, or just having too complex materials/shaders.

Samples/s actual – Number of pixel samples computed in the last second. This is the rate of how fast the anti-aliasing, depth of field, and motion blur are computed. This number is the rays/s statistic divided by rays/sample.

Rays/sample – How many rays are needed to compute a one-pixel sample. This is the measure of the shading complexity of the scene, with high numbers meaning that a lot of work needs to be done to compute each pixel. This can be caused by using too complex shaders (with ambient occlusion and rounded edges), materials having too high albedo, or using too high GI vs. AA balance.

VFB refresh time – Shows how long the VFB window takes to redraw last time.

Preview denoiser time – Shows how long it took to denoise the VFB image.

Show with original postprocessing – Shows the stored content with original postprocessing.

 After at least one LightSelect and one LightMix multi-passes are added to the scene, the interactive LightMix controls become active in the LightMix tab.

Additional actions can be performed for the LightSelect passes as follows:

Starting from Corona 12 Update 1 Collaboration features from Chaos Cloud are supported in Corona for Cinema 4D. With the Collaboration tools, you can easily share drafts and final renders with customers and team members. The Collaboration tools from Chaos Cloud also supports mark-up discussions, version control, and more, allowing for efficient and seamless project coordination in real-time.

To learn more about how to use Collaboration features from Chaos Cloud please visit this page.