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mesh_base

A mesh_pbr_base material is a physically based material, featuring PBR (physically-based rendering) and SSR (screen space reflections) technologies. It provides the realistic reflections and lighting model. The material is available in the Materials list and is set as the default one.

States

States

Material window, States tab.

Workflow

The main thing about the PBR material is a workflow. There are two workflows for Unigine PBR materials: Metalness and Specular. The specular workflow works with the old standard of textures that was used in the mesh_base material (diffuse, specular, gloss). Metalness works with the new standard of textures (albedo, metalness, roughness).

We've kept the Specular workflow to make it easier to upgrade your projects that have the old texture standard.

We strongly recommend to use Metalness workflow for creating materials in new projects: it uses a less number of texture channels, and parameters of the metalness workflow are more similar to material parameters of the real world.

By using the Workflow field you can specify the workflow of the material:

  • Metalness - with the new standard of textures.
  • Specular - with the old standard of textures.

Rendering Passes

All lights influencing opaque objects are computed by means of deferred shading (and a forward shading for transparent objects only). The only rendering pass that can come separetely from deferred is Auxiliary that is used for writing the contour of object with the specified material into an auxiliary color buffer. Detail information on the pass can be found here.

To enable the pass, check the Auxiliary option as Default in the Passes field of the States tab.

Options

States

Material window, States tab.

Ambient Emission

Ambient emission activates an additional ambient emission texture. It is used to simulates glow from extremely bright surfaces, therefore imitating real light sources and highlights. It can be used, for example, to simulate a glow of distant objects.

Light in windows simulated by Ambient emission

Shadow Shafts

Shadow shafts simulates visible volumetric shadows, arising when a bright world light source is partially obscured by the object.

Shadow shafts from the palm tree

Light Map

Light map activates an additional light map texture therefore specifying that the material will be rendered lit by it. Material color (diffuse or albedo) is multiplied by the light map and the ambient color.

Parallax

Parallax mapping activates an additional parallax texture to obtain the parallax or cutout effect.

Available options are:

  • Skip - disabled.
  • Default - apply a parallax effect that provides a convex relief based on a parallax (height) texture.
    Disabled Parallax mapping
    Enabled Parallax mapping
  • Cutout - apply a cutout effect that provides hard edges between the opaque and transparent areas.

Detail Textures

Detail activates a set of textures (diffuse, normal, specular for the Specular workflow; albedo, normal and metalness for Metalness workflow) to form a material layer. It is applied for bringing detalization to the material.

Available options are:

  • Skip - disabled.
  • Overlay - depending on the base texture (diffuse or albedo) color, the base and detail textures colors are either multiplied (for dark color pixels) or screened (for light color pixels), which leads to the contrast increase while preserving highlights and shadows. Grey pixels are not effected at all.
  • Multiply - the base texture (diffuse or albedo) color is multiplied by the detail texture color, resulting in darker colors. White pixels are not effected at all.
    Notice
    If detail textures are not visible enough in the resulting image, try increasing its color scale parameter (Diffuse or Albedo).
  • Texture mask - texture mask is used for blending base and detail materials selectively (the detail textures will be shown according to the mask).
    Notice
    This option replaced the old mesh_layer_base material.
  • Overlap (object transform) - overlap the base material by using the object transformation (detail textures will be rotated with the mesh). This option can be used to create stone material with moss, rust and corrosion atop.
    Base albedo texture
    Detail albedo texture
  • Overlap (world transform) - overlap the base textures by using the world transformation (no matter if you rotate the object, the detail textures will always be projected atop). This option can be used to create stone material with moss, rust and corrosion atop.
    Base albedo texture
    Detail albedo texture
    Notice
    These two overlap options (Overlap (object transform) and Overlap (world transform)) replaced the old mesh_overlap_base material.

Geometry Inflation

Geometry inflation allows you to apply an additional visual effect without real geometry changing. By using this option, you can create wires and balloons by specifying the type of inflation.

Notice
This option replaced the old mesh_wire_base material.

Available options are:

  • Skip - disabled.
  • Wire - wire type. It will bloat the geometry normals to provide more realistic wire depending on the distance to the mesh.
  • Balloon - balloon type. It bloats the geometry by specified constant.

Opacity Map

Opacity map indicates the alpha channel of which texture to use:

  • Main - use the alpha channel of the main (albedo or diffuse) texture.
  • Normal - use the alpha channel of the normal map.

UV settings

States

Material window, States tab.

These options specify which UV coordinates of the mesh will be used for textures.

Base Map

Base map option specifies which UV coordinates of the mesh will be used for base textures.

  • First UV - map the texture using the first UV coordinates of the mesh.
  • Second UV - map the texture using the second UV coordinates of the mesh.

Detail Map

Detail map option specifies which UV coordinates of the mesh will be used for detail textures.

  • First UV - map the texture using the first UV coordinates of the mesh.
  • Second UV - map the texture using the second UV coordinates of the mesh.

Ambient Occlusion Map

AO map activates an additional AO map texture.e for more realistic lighting.

Available options are:

  • Skip - disabled.
  • First UV - map the texture using the first UV coordinates of the mesh.
  • Second UV - map the texture using the second UV coordinates of the mesh.

Textures

All of the textures fields have set default textures, which can be replaced by your own ones. Availability of some textures depends on the set States values.

Metalness Wokflow: Base Textures

Textures

Material window, Textures tab.

Albedo Texture

Albedo texture specifies the color of the surface.

Without albedo texture
With albedo texture

The texture is 4-channeled:

  1. RGB values store color information.
  2. An alpha (A) value stores transparency information:
    • White color indicates that the area will be visible.
    • Black color indicates that the area will be transparent.

Normal Map

Normal map stores height information required to achieve an effect of Normal Mapping (a technique creating the illusion of depth for adding details without using additional polygons). When calculating lighting of the surface, the mesh geometry is overridden by the normals value.

Without normal map
With normal map

The texture is 2-channeled:

  1. RG values store two components of a surface normal.
  2. B value is calculated based on the R and G values in run-time.

Metalness Texture

Metalness texture stores information about material's metalness and roughness in different channels:

  1. R value stores information about material's metalness:
    • White pixels indicate that material is metal.
    • Black pixels indicate that material is dielectric.

    The whole applied texture channel is white
    The applied texture channel is partially white (reflective areas) and black (non-reflective white splashes)
  2. G value stores information about material's roughness:
    • White pixels indicate that material is rough.
    • Black pixels indicate that material is smooth.
    Without the applied texture channel
    With the applied texture channel

Microfiber Texture

Microfiber texture creates an effect of napped surface. The lighter the pixel, the more napped material will be.

Without microfiber texture
With microfiber texture

The texture uses only R channel.

Specular Wokflow: Base Textures

Diffuse Texture

Diffuse texture specified the color of the surface. It is lightened according to a Lambertian lighting model (light intensity is permanent regardless of the camera motion and rotation and depends solely on the angle between the surface and the light direction).

Diffuse texture

The texture is 4-channeled:

  1. RGB values store color information.
  2. An alpha (A) value stores:
    • Transparency information (if the Alpha test option is enabled):
      • White color indicates that the area will be visible.
      • Black color indicates that the area will be transparent.
    • Detail mask.

Normal Map

Normal map stores height information required to achieve an effect of Normal Mapping (a technique creating the illusion of depth for adding details without using more polygons). When calculating lighting of the surface, the mesh geometry is overridden by the normals value.

Diffuse map + Normal map

The texture is 2-channeled:

  1. RG values store two components of a surface normal.
  2. B value is calculated based on the R and G values in run-time.

Specular Map

Specular map stores the light reflectance information. It defines shininess and a highlight color of the surface. The lighting is calculated as a Lambertian lighting model plus a surface angle, light angle, and viewing angle dependent specular highlight (Blinn-Phong lighting model).

Diffuse map + Normal map + Specular map

The texture is 4-channeled:

  1. RGB values store reflection color and intensity:
    • White color indicates that the area will be reflective.
    • Black color indicates that there will be no reflections.
  2. An alpha (A) value specified the specular power (Gloss):
    • White color indicates that the specular highlights are very bright and intense.
    • Black color indicates that the specular highlights are dull.

Detail Textures

An additional set of the textures to form a material layer. The set contains all the textures from Base textures group, except for the Microfiber texture.

For the Specular workflow, the mask of the Detail textures set is specified in the Alpha channel (A) of its diffuse texture.

Notice
Detail textures are present when a Detail option is enabled.

Detail Blend Mask

Detail blend mask is a mask for two detail textures. Determines the way for two base and detail textures to be rendered.

The texture is 1-channeled:

  1. R values store information about which textures will be rendered:
    • Black areas - base textures will be shown.
    • Red areas - detail textures will be shown.

Additional Textures

Ambient Occlusion Texture

Ambient occlusion (AO) texture modulates the global environment illumination, for example, when an object is lighter at the top from sky above, and darker at the bottom from the ground below.

Without AO texture
With AO texture

The texture uses only R channel.

Emission Texture

Emission map stores information about the light emission. It is blended additively over a texture, so areas which do not glow at all should be pure black on the glow map, and any brighter colors will appear to be emitting light.

Without emission texture
With emission texture

The texture is 4-channeled:

  1. RGB values store information about a glowing color.
  2. An alpha (A) value stores a glow mask:
    • White color indicates that the area will be glowing.
    • Black color indicates that the area is not glowing.

Lightmap Texture

Lightmap is a texture storing pre-computed light information. Usually is used for static objects. See the Lightmap article for more information.

Parallax Texture

Parallax map stores information about per-pixel parallax displacement.

The texture uses only R channel:

  • White color indicates that the pixels are not displaced.
  • Black color indicates that the pixels will be depressed farthest away.

Parameters

Notice
Availability of some parameters depends on the set States field values.

Transformation Parameters

The tiling and offset for the textures set are set in the Transform field of the Parameters tab.

Texture Coordinates Transformation

Texture coordinates transformation parameter is a vector of four float components, consisting of two pairs of vector elements:

  • Scale texture coordinates, along the X and Y axes.

    For example, by the scale of 2;2 the texture will be repeated four times on the surface. See the second picture below.

  • An offset of the texture respectively to its initial position along X and Y axes.

    For example, by the offset of 0.5 along the X axis the texture will be repositioned to the right (so the left edge of the texture will be rendered in the center). See the third picture below.

Base Textures Shading Parameters

The group of parameters in the Shading tab contains options for base textures.

Metalness Workflow: Base Textures Shading Parameters

Albedo

Albedo is a multiplier of the base color of the surface provided by the albedo texture.

Different Albedo parameters for the white albedo texture
Metalness

Metalness is a multiplier of metalness.

Changing the Metalness parameter, from 0 to 1
IOR

IOR is the index of refraction of the material (IOR). This parameter is enabled only for dielectric materials and has influence on the intensity of the reflection. For example, water has a value of 0, plastic 0.5, diamond 1. For the most part of materials you can use the value of 0.5.

Roughness

Roughness is a multiplier of the roughness of a surface.

Changing the Roughness parameter, from 0 to 1
Normal

Normal is an intensity of the relief of the normal map.

Changing the Normal parameter, from 0 to 1
Back

Back is a scale of the translucency effect, which permits light to pass through the object, but diffuses it so objects on the opposite side are not clearly visible.

Back = 0
Back = 1

Specular Worklow: Base Textures Shading Parameters

Diffuse

Diffuse defines the base color of the surface.

Diffuse

Diffuse is a coefficient setting the brightness of the diffuse texture. The higher the value, the brighter the diffuse texture is.

Specular

Specular is a color picker to choose the auxiliary specular color for the specular texture. It can be used for specifying different specular colors for one texture or modifying the texture color on the spot. The specular color of the texture and this color will be blended.

Normal

Normal is a coefficient to scale the intensity of the normals (provided by a normal map). The higher the value, the higher the normal texture effect is.

Gloss

Gloss is a coefficient modifying the size of the highlight (Phong shading). Low values imitate wider highlights, typically appropriate to create diffuse reflection from mat surfaces. High values imitate pinpoint highlights, typically appropriate to create uniform reflection of light rays from glossy surfaces.

Microfiber

Microfiber is a coefficient to scale the intensity of the microfiber (provided by a microfiber texture). The higher the value, the higher the microfiber texture effect is.

Parallax Height

Parallax height is a coefficient to scale the power of the parallax texture displacements. The higher the value, the bigger the normals are.

Parallax Step

Parallax step parameter specifies the step of the parallax mapping.

Auxiliary Color

Auxiliary color parameter specifies the constant color for the auxiliary pass.

Notice
The Auxiliary color parameter is present only if the Auxiliary pass is enabled.

Lightmap

Lightmap Scale

Lightmap scale is a coefficient to scale the intensity of the light map illumination. The higher the value, the brighter the illumination is.

Lightmap Gamma

Lightmap gamma is a coefficient to specify the gamma of the light map illumination.

Notice
The Lightmap parameter is present only if the Lightmap option is enabled.

Decal Mask

Decal mask parameter specifies decal bit-mask. If the decal mask of the decal material matches the surface material, the decal will be projected.

Detail Textures Shading Parameters

Metalness Workflow: Detail Textures Shading Parameters

A set of the shading parameters for detail textures:

Notice
Detail parameters are present if a Detail option is enabled.
Albedo

Albedo is a multiplier of the detail color of the surface provided by the detail albedo texture similar to the base texture Albedo parameter.

Metalness

Metalness is a multiplier of metalness provided by the detail metalness texture similar to the base texture Metalness parameter.

Roughness

Roughness is a multiplier of the roughness of a surface similar to the base texture Roughness parameter.

Albedo Visibility

Albedo visibility specifies the influence of the detail texture albedo over the base texture albedo.

Metalness Visibility

Metalness visibility specifies the influence of the detail texture metalness over the base texture metalness.

Roughness Visibility

Roughness visibility specifies the influence of the detail texture roughness over the base texture roughness.

Normal Visibility

Normal visibility parameter specifies the influence of the detail normal texture normal over the surface.

Specular Workflow: Detail Textures Shading Parameters

A set of the shading parameters for detail textures:

Notice
Detail parameters are present if a Detail option is enabled.
Diffuse

Diffuse is a multiplier of the detail color of the surface provided by the detail diffuse texture similar to the base texture Diffuse parameter.

Specular

Specular is a color picker to choose the auxiliary specular color for the detail specular texture similar to the base texture Specular parameter..

Gloss

Gloss is a parameter modifying the size of the highlight of the detail texture similar to the base texture Gloss parameter.

Diffuse Visibility

Diffuse visibility specifies the influence of the detail texture diffuse over the base texture diffuse.

Specular Visibility

Specular visibility specifies the influence of the detail texture specular over the base texture specular.

Gloss Visibility

Gloss visibility specifies the influence of the detail texture gloss over the base texture gloss.

Normal Visibility

Normal visibility parameter specifies the influence of the detail normal texture normal over the surface.

Emission

The set of emission parameters:

Color

Color is a color picker to choose a color multiplier for the emission texture.

Scale

Scale is a coefficient to scale emission texture intensity. The higher the value, the lighter and brighter light areas of the emission texture are.

Last update: 2017-07-03