...just for completeness-sake, here's the C code version of that earlier test routine...

static PyObject *timetest1(PyObject *self, PyObject
*args)<br></br>
{<br></br>
 PyListObject *pVectorList;  // the passed in vector list
(list-of-Vectors)<br></br>
 VECTOR *pVector;<br></br>
 double ray[3] = {0.0, 1.0, 0.0};<br></br>
 double pn[3] = {0.0, 1.0, 0.0};<br></br>
 double point[3];<br></br>
 double *v;<br></br>
 double *v0,*v1,*v2;<br></br>
 double intersect = 1.0;<br></br>
 double ndota, ndotv;<br></br>
 long vCount, pi, vi;

 // start by deconstructing the args<br></br>
 if (!PyArg_ParseTuple(args, "iO", &vCount,
&pVectorList ))<br></br>
  onError("timetest requires a count and a list of
vectors");

 if(!PyList_Check(pVectorList))<br></br>
  onError("timetest requires a list of vectors as
second arg");

 // try to modify each vertex...<br></br>
 for(pi=0; pi<100; pi++)<br></br>
 {<br></br>
  for(vi=0; vi<vCount; vi++)<br></br>
  {<br></br>
   double eu[3], ev[3], wx[3];<br></br>
   double uu, vv, uv, wu, wv;

   // get each vertex/vector...<br></br>
   pVector = (VECTOR
*)pVectorList->ob_item[vi]; //PyList_GET_ITEM(pVectorList,
i);<br></br>
   if(!isVector(pVector))<br></br>
    onError("timetest requires a list of
vectors as second arg");<br></br>
   v = &pVector->v[0];

   ndota = V3_DOT(pn, ray);<br></br>
   ndotv = V3_DOT(pn, v);

   point[0] = v[0] + (ray[0] *
intersect);<br></br>
   point[1] = v[1] + (ray[1] * intersect);<br></br>
   point[2] = v[2] + (ray[2] *
intersect);

   v0 = &((VECTOR
*)pVectorList->ob_item[0])->v[0]; //PyList_GET_ITEM(pVectorList,
0);<br></br>
   v1 = &((VECTOR
*)pVectorList->ob_item[1])->v[0]; //PyList_GET_ITEM(pVectorList,
1);<br></br>
   v2 = &((VECTOR
*)pVectorList->ob_item[2])->v[0]; //PyList_GET_ITEM(pVectorList,
2);

   V3_SUB(v1, v0, eu);  //
vecsub(v1,v0)<br></br>
   V3_SUB(v2, v0, ev);  //
vecsub(v2,v0)<br></br>
   uu = V3_DOT(eu, eu); //
vector_dotproduct(eu,eu)<br></br>
   vv = V3_DOT(ev, ev); //
vector_dotproduct(ev,ev)<br></br>
   uv = V3_DOT(eu, ev); //
vector_dotproduct(eu,ev)<br></br>
   V3_SUB(point, v0, wx); //
vecsub(point,v0)<br></br>
   wu = V3_DOT(wx, eu); //
vector_dotproduct(wx,eu)<br></br>
   wv = V3_DOT(wx, ev); //
vector_dotproduct(wx,ev)<br></br>
  }<br></br>
 }

 Py_INCREF(Py_None);<br></br>
 return Py_None;<br></br>
}<br></br>

...it's not quite as easy to follow as the python code currently, but it's doing the exact same computations.

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