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User Interface:: Main Panel

The VSSPmax User Interface is made of two main elements: Main Panel (image below) and Tabs.
vssp_ui_main
Methods – The Indirect Illumination (Global Illumination) calculation methods (Primary bounces/Secondary bounces).
None – VSSPmax don’t affect any parameters of renderer (Default). The majority of the parameters is inactive/disabled.
Custom – The user can specify other GI method (for example BF & BF, etc…). VSSPmax can set/get renderer parameters.
IM & LC – Irradiance Map and Light Cache method (faster but less accurate, for majority of the calculations entirely acceptable).
BF & LC – Brute Force and Light Cache method (most recommended for V-Ray 3.x).
Quality – VSSPmax default rendering presets.
Custom – The user can control parameters at discretion and save them to presets list.
Low – a draft quality preset for preview purposes.
Medium – Slightly higher quality preview/test preset.
High
Very High
Production
Ultra High
All VSSPmax presets affects GI settings, Adaptive Image Sampler, Global DMC, Light/Camera sampling (if checked corresponding checkboxes).
Presets – resolution dependent. For example, when the output image resolution grows, Light Cache subdivs need to be increased and some Irradiance Map values can be lowered.

Affect Lights Sampling – When this option is checked for the all scene VRayLight’s parameter Subdivs will be affected by VSSPmax presets. The option is enabled only when selected one from VSSPmax quality presets.
Affect Cameras Sampling – When this option is checked for the all scene VRayPhysicalCamera’s parameter Subdivs will be affected by VSSPmax presets. The option is enabled only when selected one from VSSPmax quality presets.

Output Size – This is the resolution that you wish to use with the V-Ray frame buffer.

Render Region Division – Here you can control parameters of V-Ray’s rendering regions (buckets) and determine the order in which the regions are rendered.

Adaptive Image Sampler
An Image Sampler refers to an algorithm for sampling and filtering the image function and producing the final array of pixels that constitute the rendered image. V-Ray implements several algorithms for sampling an image, but in VSSPmax only one algorithm is used – Adaptive Image Sampler.
More about algorithm © Chaos Software.
Parameters are the same as the V-Ray.
Recommended Info: Demystifying V-Ray DMC Sampler © Toni Bratincevic.
Useful Tool: V-Ray DMC Calculator © Akin Bilgic.

Color Mapping
In VSSPmax one type of V-Ray Color Mapping type is used – Reinhard. This mode is a blend between exponential-style color mapping and linear mapping. If the Linear value is 100% – the result is linear color mapping, if the Exponential value is 100% – the result is exponential-style color mapping. Toggle button Reinhard enables the blending slider and sets the V-Ray Color Mapping type – Reinhard.
Parameters are the same as the V-Ray.
More about Color Mapping © Chaos Software.

Global DMC
Instead of having separate sampling methods for each of the blurry values, V-Ray has a single unified framework that determines how many and which exact samples are to be taken for a particular value, depending on the context in which that value is required. This framework is called the DMC Sampler.
More about DMC Sampler © Chaos Software.
Parameters are the same as the V-Ray.

Preview
In group Preview is a small Image for quick rendering preview (useful with Low quality rendering settings), some buttons/toggle buttons for quick manipulations of the corresponding functions.
Preview – Render to a small preview Image.
Render VFB – Render to a V-Ray Frame Buffer.
AA Filter – Enables Antialiasing filter.
Show SF – Show Safe Frames (The Safe Frame provides a guide to help avoid rendering portions of your image that might be blocked in the final output).
Show Last VFB – If you have rendered to the V-Ray Frame Buffer, but have closed it, this button allows you to open it again.