The Two Sided material is a utility material provided with the V-Ray renderer. The material allows seeing the light on the backside of the objects. Use this material to simulate thin translucent surfaces like paper, cloth curtains, tree leaves, etc.
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The Two Sided material settings are organized in Basic and Advanced modes. You can switch the mode from the toggle button () under the Preview Swatch or globally from the Configuration rollout of the Settings tab.
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The context options of the Color Slot allow to Copy and Paste a color from one color slot to another, as well as to reset the color selection.
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A Reset option is provided in the context menu of each Number Slider. You can reset the slider value to the default one.
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Two Sided Parameters
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Some options are available only in Advanced mode.
Front Material – Sets the material to be used for front faces as defined by the object normals.
Back Material – Sets the material to be used for back side backside faces as defined by the object normals.
Translucency – Determines which side (front or back) relative to the camera is more visible in the rendering process. By default this color is black (0.0), which means that only the front side is visible. When set closer to white (1.0), more of the Back material is seen. When set closer to black (0.0), more of the Front material is seen.
Mult. By Front Diffuse – When enabled, the Translucency is multiplied by the Front material.
Force Single Sided – When enabled, the sub-materials renders as one-sided materials. Disabling is not recommended.
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Texture – Selected Bitmap texture is displayed in the viewport and it overrides all other material parameters. The viewport texture does not affect the way the material is rendered with V-Ray. It is mainly used for preview purposes.
Keep in mind that procedural textures are not shown in the viewport, however, any Bitmap textures, including ones nested in procedurals, will be automatically displayed.
