The Polygon Side node assigns black or white values based on the normal direction of a polygon object.
The only Parameter is Invert, which you can use to swap if you wish.
The Polygon Side Texture is useful for assigning different textures or materials to different sides of a polygon object. This can be done by setting the Polygon Side Texture for the amount input of the Mix Texture for the DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. channel as shown above. It is a simple setup and you can use it for many scenarios.
The result connects to the OctaneRender® material's Diffuse channel, which applies to a twisted polygon. Figure 3 shows a rendering of the twisted geometry. This technique is useful for i.e. creating a leaf with different colors or materials applied to each side.
This feature does not have effect on the most used standard ArchiCAD Elements (such as walls and floors) which only have one normal Direction on the outer surfaces. But the Polygon Side Texture does have effect on the ArchiCAD Mesh, which has different normal direction for the top and bottom surfaces.
Some imported *.gsm models might have different sides of a polygon object with different normal directions and therefor this feature can be used.
In the next example a *gsm object of a dress (on a stool) has just one material but has two normal directions.
This image below shows the Render Pass ‘MaterialThe representation of the surface or volume properties of an object. ID’ to show the Object has just one material.
The figures above show the settings used for the images below.
The setup shown on the left is used for the dress on the left and right setup is used for the dress on the right.
The image below show the swapping textures (by using the normal direction) to change the Invert input from Enabled to Disabled.
