SOP : Input source queries

[nicholas_yue]

Hi,

 

  I am prototyping an UV base Scattering SOP.

 

  Note : The following questions may have come about because my design is flawed and not inline with the procedural nature of the SOP network.

 

  This UVScatter SOP takes two input, source0 is the mesh input and source1 are the UVs used for evaluating the points on the input mesh.

 

  (1) How do I check if a particular source is connected ? I see source change methods with index parameters but that is probably not useful for me as there could be nothing connected yet.

  (2) How do I check if a particular class of attribute is supplied by a given source ?

 

  My first source (source 0) must have UVs on the mesh so I do a check for "uv" but the gdp->Find*Attribute() does not differentiate the source of the attributes.

 

  Or would it be the case that I need to be selective as to how I duplicate source and keep them separate for checking ?

 

Cheers

 

[nicholas_yue]

Answering my own question, I found a parent method call inputGeo() and was able to use it to achieve the effect I needed.

 

i.e.     const GU_Detail* gdp1 = inputGeo(1);

[edward]

 (2) How do I check if a particular class of attribute is supplied by a given source ?

 

  My first source (source 0) must have UVs on the mesh so I do a check for "uv" but the gdp->Find*Attribute() does not differentiate the source of the attributes.

 

GA_Detail::find*Attribute() methods are either like findPointAttribute(), findVertexAttribute(), etc...

 

If you have a GA_Attribute (or attribute ref), you can also get the detail, and compare &attr->getIndexMap() with the detail's &getPointMap()