The V-Ray UV Explicit VOP allows you to convert an input (either float or vector) into a "uvwgen" data stream to be used for texture mapping. The majority of V-Ray textures have a "uvwgen" input which expects custom "uvwgen" data – the V-Ray UV Explicit VOP allows you to convert regular color or float data into the custom format expected for texture mapping.
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To convert "uvwgen" data into color data, you can use the V-Ray UVW to Texture VOP.
To extract components from a vector, you can use the V-Ray Color Channel VOP.
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Using explicit UVs disables texture filtering for the textures that use the UV Explicit VOP as a "uvwgen" input. This means that tiled .tx files will be loaded at full resolution and will require more time to sample properly.
