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The Corona Scanned Material allows you to use Chaos Scans with Corona.

There are some materials that are impossible to recreate with any number of parameters and maps in a generalized material, as they have a unique way of responding to light. This is where Chaos Scans VRSCANS comes in. Each material in the library is meticulously scanned to capture how it interacts with light so that you can drag-and-drop it into your scene for 100% accuracy in both look and scale.

File File – The file name with the data for the scanned material; usually has a .vrscan extension. (little folder icon on the right)

Reload – Refreshes the .vrscan file loaded in the material. (little recycle icon on the right)

Download Chaos Scan – This button redirects you to the Chaos Scans download web page. (little sphere icon on the right)

Information – Displays some useful information contained in the .vrscan file, such as the actual material sample size.

Tiling scale – This sets the number of repetitions (tilings) for the material.

2-Sided – Forces the back-facing polygons to be shaded in the same way as the front-facing ones. When disabled, the back-facing polygons appear black. This can be useful for objects like curtains. Note that this option is always considered enabled when rendering transparent materials.

Disable transparency – Disables transparency for materials that store such information. This can be useful for speeding up the rendering, especially when the transparency produces little or no effect.

Filter color

Enable – This enables the color filtering parameters.

Level – This parameter defines the intensity of the Filter color parameters.

Color – A color for the material sample that can be used to tint the material. (It affects the color of the reflections as well. Acts as a post effect.) See the Filter Color example below.

Texture – This parameter sets either a texture map or a procedural shader to use for color filtering.

Mix mode – This parameter defines how the texture map or shader will combine combines with the color parameter.

Mix strength – This parameter defines the texture's percentage that will be is mixed with the color parameter. It works like opacity for the texture. 

Paint color

Enable – This enables the paint color parameters.

Level – This parameter defines the intensity of the Paint color parameters.

Color – This parameter changes the color of the material without losing the texture or changing the reflection color. For example, it can be used to change the color of wood or leather without losing the material texture.

Texture – This parameter sets either a texture map or a procedural shader to use for color painting.

Mix mode – This parameter defines how the texture map or shader will combine combines with the color parameter.

Mix strength – This parameter defines the texture's percentage that will be is mixed with the color parameter. It works like opacity for the texture.

Gamma – Controls the color curve correction of the material.

Saturation – Controls the saturation of the material (including Filter Color and Paint Color if used) as a post-effect. See the Saturation example below.

Strength Strength – Specifies the strength of the coat reflections. 

Texture – This parameter sets either a texture map or a procedural shader to use for the clear coat.

IOR – Determines the IOR of the coat layer, and from that, controls the strength of the reflections. A value of 1.0 does not produce any reflections and disables the coat layer. Higher values produce stronger clear coat reflections. The .vrscan files typically contain the correct value for this parameter, and it is set automatically when the file is loaded.

Bump multiplier – The coat layer has a built-in bump map stored in the material sample file. This allows control over the strength of that bump.

Coloring – Colors the coat reflections.

Glossiness – Controls the sharpness of reflection. A value of 100% means perfect glass-like reflection; lower values produce blurry or glossy reflections.

Glossiness variation – Controls the effect of glossiness growth under shallow observation angles. This parameter represents a real physical effect proper to materials like brushed metals, plastics, etc. The parameter range is 0-100%. Higher values produce a faster transition of the glossiness to 1 when the observation angle goes to zero.

Visibility

Visible directly – When enabled, this makes the Corona Legacy material directly visible to the camera.

Visible in reflections – When enabled, this makes the Corona Legacy material directly visible in reflections.

Visible by GI – When enabled, this makes the Corona Legacy material directly visible for GI calculation.

Visible in refractions – When enabled, this makes the Corona Legacy material directly visible in refractions.

Propagate masks – This parameter specifies the propagation of non-shading render elements (masks) after interaction with the material.Available modes are:

Never – Mask passes are never propagated through the material, i.e. the material is always visible in masks.
Through reflection – Mask passes are propagated through the material if reflection occurs.
Through refraction – Mask passes are propagated through the material if refraction occurs.
Always – Mask passes are always propagated through the material, i.e. the material is never visible in masks.
Invisible in masks – This mode makes the material invisible in masks.

Advanced options

Material ID – This parameter defines an ID for the material that can be used in the Corona Compositing tag or in the Corona Data shader.

Alpha mode – This parameter specifies how the objects with the material are visible in the alpha channel.

Available modes are:

Default – This is the default mode. In this mode, the material alpha value is derived from its opacity and refract components.
Always black – In this mode, the material alpha value is black (material shows as transparent).
Always white – In this mode, the material alpha value is white (material shows as opaque).

Bump and Parallax Zone – Determines the point where additional bump and parallax no longer exist, and only natural height effects remain. This option is especially useful for shallow angles of view to the material, where it might appear flat or less detailed. A value of 0 adds no additional bump and parallax. A value of 1 adds additional bump and parallax equally regardless of the view angle. All scanned materials, by default, have the most suitable value loaded for this parameter to achieve the most realistic look. If you need full control over the bump and the parallax, set the value to 1 and work with the Parallax and Bump Multipliers. 

Parallax Multiplier – Adjusts additional parallax and edge displacement strength. 

Bump Multiplier – Adjusts the additional bump. 

Edges Displacement – Uses a special technique that makes the edges of the geometry appear slightly jagged inwards. This option is useful when rendering close-ups of materials with bumps. It is faster than actual displacement and helps to achieve better realism.