Here is a description of the input buttons for this box:

• MAP is the path to the texture map file, usually created with txmake.
• S is the "horizontal" or x coordinate for the texture map lookup.
• T is the "vertical" or y coordinate for the texture map lookup.
• CHN selects the which channel from the map to be used to generate the texture:
  • 0 is red only
  • 1 is green only
  • 2 is blue only
  • 3 is the opacity only
  • 4 is red,green,blue.
• WS is the number of horizontal filter samples.
  This may be used to enhance the horizontal filtering.
• WT is the number of vertical filter samples.
  This may be used to enhance the vertical filtering.
• FLT selects which filter to use when sampling the texture map.
  Possible filters are box and gaussian.
• INT is a flag which enables or disables interpolate between adjacent resolutions of a multi-resolution texture When enabled, this smooths the transition between resolutions.

The outputs:

• TEX is the color returned from the texture map.
• TXOP is the value of the opacity channel in the texture map,
  if it had one, returned as either a color or a floating point number.

For more details on texture mapping refer to pages 320-321 in the RenderMan Companion.