The Octane UV projection node uses the UV texture coordinates of the mesh to map the texture onto the surface. It is not always necessary to connect a UV projection node to the texture as UV Projection is the default mapping method. However, it may be useful for mapping a texture to a surface that has multiple UV sets The UV projection node has a single UV Set attribute which is used to specify the UV set needed for the texture. The attribute is a numerical value that ranges from 1 to 3. Figure 1 shows the parameter for the UV Projection node in Maya’s Attribute Editor.
Figure 1: The parameters for the UV Projection node.
Figure 2 shows a Checks texture applied to a surface with UV texture coordinates (Figure 3). Figure 4 shows a graph of this arrangement. The Transform 3D node is used to position the Checks texture. The UV Projection node is connected to the Checks texture.
Figure 2: A surface withe a Checks surface applied using UV Projection.
Figure 3: The UV texture coordinates for the surface.
Figure 4: The graph of the Octane material using the UV Projection node.