Use radians everywhere, including ModelInstance::rotation

xs/src/libslic3r/Model.cpp

@@ -485,7 +485,7 @@ ModelObject::center_around_origin()
             // apply rotation and scaling to vector as well before translating instance,
             // in order to leave final position unaltered
             Vectorf3 v = vector.negative();
-            v.rotate(Slic3r::Geometry::deg2rad((*i)->rotation), (*i)->offset);
+            v.rotate((*i)->rotation, (*i)->offset);
             v.scale((*i)->scaling_factor);
             (*i)->offset.translate(v.x, v.y);
         }
@@ -523,9 +523,6 @@ ModelObject::scale(const Pointf3 &versor)
 void
 ModelObject::rotate(float angle, const Axis &axis)
 {
-    // we accept angle in radians but mesh currently uses degrees
-    angle = Slic3r::Geometry::rad2deg(angle);
-    
     for (ModelVolumePtrs::const_iterator v = this->volumes.begin(); v != this->volumes.end(); ++v) {
         (*v)->mesh.rotate(angle, axis);
     }

xs/src/libslic3r/Model.hpp

@@ -177,7 +177,7 @@ class ModelInstance
 {
     friend class ModelObject;
     public:
-    double rotation;            // around mesh center point
+    double rotation;            // in radians around mesh center point
     double scaling_factor;
     Pointf offset;              // in unscaled coordinates
     

xs/src/libslic3r/TriangleMesh.cpp

@@ -202,6 +202,9 @@ void TriangleMesh::translate(float x, float y, float z)
 
 void TriangleMesh::rotate(float angle, const Axis &axis)
 {
+    // admesh uses degrees
+    angle = Slic3r::Geometry::rad2deg(angle);
+    
     if (axis == X) {
         stl_rotate_x(&(this->stl), angle);
     } else if (axis == Y) {