Raytracing: Added function to rescale a luxrender matrix

src/Mod/Raytracing/App/AppRaytracingPy.cpp

@@ -238,6 +238,19 @@ copyResource(PyObject *self, PyObject *args)
     Py_Return;
 }
 
+/// rescales a lux matrix
+static PyObject *
+scaleLuxMatrix(PyObject *self, PyObject *args)
+{
+    float factor;
+    const char *mat;
+    if (! PyArg_ParseTuple(args, "sf", &mat, &factor)) 
+        return NULL;
+    std::string result, luxmatrix(mat);
+    result = LuxTools::rescaleMatrix(luxmatrix, factor);
+    return Py::new_reference_to(Py::String(result));
+}
+
 /* registration table  */
 struct PyMethodDef Raytracing_methods[] = {
     {"writeProjectFile", writeProjectFile, 1},
@@ -245,9 +258,10 @@ struct PyMethodDef Raytracing_methods[] = {
     {"writePartFile",    writePartFile   , 1},
     {"writePartFileCSV", writePartFileCSV, 1},
     {"getPartAsPovray",  getPartAsPovray , 1},
-    {"getPartAsLux",     getPartAsLux , 1},
-    {"writeDataFile",    writeDataFile , 1},
+    {"getPartAsLux",     getPartAsLux ,    1},
+    {"writeDataFile",    writeDataFile ,   1},
     {"writeCameraFile",  writeCameraFile , 1},
     {"copyResource",     copyResource    , 1},
+    {"scaleLuxMatrix",   scaleLuxMatrix ,  1},
     {NULL, NULL}
 };

src/Mod/Raytracing/App/LuxTools.cpp

@@ -37,7 +37,9 @@
 #include <Base/Console.h>
 #include <Base/Exception.h>
 #include <Base/Sequencer.h>
+#include <Base/Matrix.h>
 #include <App/ComplexGeoData.h>
+#include <boost/regex.hpp>
 
 
 #include "PovTools.h"
@@ -135,3 +137,19 @@ void LuxTools::writeShape(std::ostream &out, const char *PartName, const TopoDS_
     out << "    \"string name\" [\"" << PartName << "\"]" << endl;
     out << "AttributeEnd # \"\"" << endl;
 }
+
+std::string LuxTools::rescaleMatrix(std::string mat, float factor)
+{
+    // clean the input string
+    std::string matstring = mat.substr(11);
+    unsigned pos = matstring.find("]");
+    matstring = matstring.substr(0,pos);
+    // create a matrix and rescale it
+    Base::Matrix4D trans;
+    trans.fromString(matstring);
+    trans.scale(factor,factor,factor);
+    // create output
+    std::stringstream result;
+    result << "Transform [" << trans.toString() << "]" << endl;
+    return result.str();
+}

src/Mod/Raytracing/App/LuxTools.h

@@ -41,6 +41,8 @@ namespace Raytracing
         static std::string getCamera(const CamDef& Cam);
         /// returns the given shape as luxrender material + shape data
         static void writeShape(std::ostream &out, const char *PartName, const TopoDS_Shape& Shape, float fMeshDeviation=0.1);
+        /// rescales a lux matrix by the given factor
+        static std::string rescaleMatrix(std::string mat, float factor);
     };
 } // namespace Raytracing