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Basic Program example

The following is a basic Dt based plug-in that queries the selected objects and outputs the name of the shape (mesh) and any “color” texture file names that are mapped to the shader.

#include <maya/MSimple.h> 
#include <MDt.h> 
#include <MDtExt.h> 
DeclareSimpleCommand( basic, "Alias - Example", "2.0"); 
void outputFileNames() 
{ 
char *shapeName; 
char *mtlName; 
char *texName; 
// 1st thing find out how many shapes (meshes) are in this scene 
// currently being looked at. 
int numShapes = DtShapeGetCount(); 
// For each shape, check out what is assigned as the color texture 
// There may not be a texture associated with material, or the 
texture 
// may be a procedural texture and so have no file name. 
for ( int shape=0; shape < numShapes; shape++ ) 
{ 
// Find the name of the current shape that we are looking at. 
DtShapeGetName( shape, &shapeName ); 
// Find out the number of groups (materials) assigned to this 
shape 
numGroups = DtGroupGetCount( shape ); 
// For each group (material) check out to see if there is a file 
texture 
// associated with the material and output its name. 
// It is possible that the number of groups will be zero.  In this 
case 
// there would be no materials assigned: 
// 1) Joint or other Transform node 
// 2) user deleted all of the materials including the default 
shading group 
// 3) removed the connections between the mesh and the shading 
groups. 
// Usual reason is #1, a Joint or straight Transform node. (when 
using 
// full hierarchy mode 
    for ( int group=0; groups < numGroups; group++ ) 
    { 
       // For the current shape+group combination find out its 
material 
        
       DtMtlGetName( shape, group, &mtlName ); 
       // For the current material, find out its texture file 
name if any 
  
       DtTextureGetFileName( mtlName, &texName ); 
       // output any information that is wanted about what we 
found above. 
       printf( "for shape %s(%d) group %s(%d), texture filename is 
%s\n", 
              shapeName, shape, mtlName, group, texName ? texName 
: "(NULL)" ); 
    } 
  } 
} 
// 
// main doIt function for the plugin command. 
MStatus basic::doIt( const MArgList& args ) 
{ 
// Initialize the Dt database 
DtExt_SceneInit( “basic” ); 
// using the default settings, as no initializer 
// functions are called here 
// Walk the dag and fill in the internal database 
DtExt_initdb(); 
// walk thru shapes found and output the texture file names 
outputFileNames(); 
// Clean up the allocated memory and internal storage 
DtExt_CleanUp(); 
// return from the plugin command 
return MS::kSuccess; 
}