/////////////////////////////////////////////////////////////////////////////
// renderManCurves.mel Version 1.0 by Andrew Osiow  Copyright 2009
//
// adds the necessary Attributes to make selected Curve Renderable with RenderMan for Maya
// Creates a New RenderMan Shader Node to which a RSL Fur Shader can be connected.
//
// It's assumed that Render for Maya or RenderMan Studio has been loaded
// and the user has selected a valid collection of Nurb Curves that
// been converted from a pfx node.
//
/////////////////////////////////////////////////////////////////////////////

global proc renderManCurves ()
{// Creates a default RenderMan Shader
  string $selectedCurves[] = `ls -sl`;
  string $shapeNode[];
  string $newRMShader =`shadingNode -asShader RenderManShader`;
  string $newRMShaderGrp =`sets -renderable true -noSurfaceShader true -empty -name ($newRMShader+"SG")`;
  connectAttr -f ($newRMShader+".outColor") ($newRMShaderGrp+".surfaceShader");
  for ($curve in $selectedCurves)
  {// rebuild curve to 3rd degree - 2nd degree paint fx curves are not supported by RenderMan
    rebuildCurve -ch 0 -rpo 1 -rt 0 -end 1 -kr 2 -kcp 0 -kep 1 -kt 0 -s 0 -d 3 $curve;
   // getShape Node 
    $shapeNode = `listRelatives -s $curve`;
   // add attributes to render curves
    addAttr -k true -w true -ln "rman__torattr___curveBaseWidth" -at "float" -dv 0.10 $shapeNode[0];
    addAttr -k true -w true -ln "rman__torattr___curveTipWidth" -at "float" -dv 0.10 $shapeNode[0];
    addAttr -k true -w true -ln "rman__torattr___customShadingGroup" -dt "string" $shapeNode[0];
   // connect the curves up a renderMan Shader
    connectAttr -f ($newRMShaderGrp+".message") ($shapeNode[0]+".rman__torattr___customShadingGroup");
  }
}