diff --git a/panda/src/display/graphicsStateGuardian.I b/panda/src/display/graphicsStateGuardian.I
index 02d3883d50..134c086677 100644
--- a/panda/src/display/graphicsStateGuardian.I
+++ b/panda/src/display/graphicsStateGuardian.I
@@ -540,23 +540,6 @@ get_coordinate_system() const {
   return _coordinate_system;
 }
 
-////////////////////////////////////////////////////////////////////
-//     Function: GraphicsStateGuardian::get_internal_coordinate_system
-//       Access: Public
-//  Description: Returns the coordinate system used internally by the
-//               GSG, if any one particular coordinate system is used.
-//               The default, CS_default, indicates that the GSG can
-//               use any coordinate system.
-//
-//               If this returns other than CS_default, the
-//               GraphicsEngine will automatically convert all
-//               transforms into the indicated coordinate system.
-////////////////////////////////////////////////////////////////////
-INLINE CoordinateSystem GraphicsStateGuardian::
-get_internal_coordinate_system() const {
-  return _coordinate_system;
-}
-
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsStateGuardian::get_cs_transform
 //       Access: Public
diff --git a/panda/src/display/graphicsStateGuardian.cxx b/panda/src/display/graphicsStateGuardian.cxx
index 6976679571..f11022b710 100644
--- a/panda/src/display/graphicsStateGuardian.cxx
+++ b/panda/src/display/graphicsStateGuardian.cxx
@@ -842,6 +842,24 @@ set_coordinate_system(CoordinateSystem cs) {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: GraphicsStateGuardian::get_internal_coordinate_system
+//       Access: Public, Virtual
+//  Description: Returns the coordinate system used internally by the
+//               GSG.  This may be the same as the external coordinate
+//               system reported by get_coordinate_system(), or it may
+//               be something different.
+//
+//               In any case, vertices that have been transformed
+//               before being handed to the GSG (that is, vertices
+//               with a contents value of C_clip_point) will be
+//               expected to be in this coordinate system.
+////////////////////////////////////////////////////////////////////
+CoordinateSystem GraphicsStateGuardian::
+get_internal_coordinate_system() const {
+  return _internal_coordinate_system;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsStateGuardian::issue_transform
 //       Access: Public, Virtual
diff --git a/panda/src/display/graphicsStateGuardian.h b/panda/src/display/graphicsStateGuardian.h
index a4eedcf970..a3c7e35d18 100644
--- a/panda/src/display/graphicsStateGuardian.h
+++ b/panda/src/display/graphicsStateGuardian.h
@@ -184,7 +184,7 @@ public:
 
   void set_coordinate_system(CoordinateSystem cs);
   INLINE CoordinateSystem get_coordinate_system() const;
-  INLINE CoordinateSystem get_internal_coordinate_system() const;
+  virtual CoordinateSystem get_internal_coordinate_system() const;
 
   INLINE const TransformState *get_cs_transform() const;
 
diff --git a/panda/src/dxgsg8/dxGeomMunger8.cxx b/panda/src/dxgsg8/dxGeomMunger8.cxx
index 33bcb43c2f..a284437e1c 100644
--- a/panda/src/dxgsg8/dxGeomMunger8.cxx
+++ b/panda/src/dxgsg8/dxGeomMunger8.cxx
@@ -46,20 +46,18 @@ munge_format_impl(const qpGeomVertexFormat *orig,
   new_format->set_animation(animation);
   PT(qpGeomVertexArrayFormat) new_array_format = new qpGeomVertexArrayFormat;
 
-  const qpGeomVertexColumn *vertex_type = 
-    orig->get_column(InternalName::get_vertex());
-  const qpGeomVertexColumn *normal_type = 
-    orig->get_column(InternalName::get_normal());
-  const qpGeomVertexColumn *color_type = 
-    orig->get_column(InternalName::get_color());
+  const qpGeomVertexColumn *vertex_type = orig->get_vertex_column();
+  const qpGeomVertexColumn *normal_type = orig->get_normal_column(); 
+  const qpGeomVertexColumn *color_type = orig->get_color_column();
   const qpGeomVertexColumn *texcoord_type = 
     orig->get_column(InternalName::get_texcoord());
 
   if (vertex_type != (const qpGeomVertexColumn *)NULL) {
     new_array_format->add_column
       (InternalName::get_vertex(), 3, qpGeomVertexColumn::NT_float32,
-       qpGeomVertexColumn::C_point);
+       vertex_type->get_contents());
     new_format->remove_column(vertex_type->get_name());
+
   } else {
     // If we don't have a vertex type, not much we can do.
     return orig;
diff --git a/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx b/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
index 187b232948..735e5dcd9a 100644
--- a/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
+++ b/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
@@ -54,6 +54,7 @@
 #include "qpgeomTriangles.h"
 #include "qpgeomTristrips.h"
 #include "qpgeomTrifans.h"
+#include "qpgeomLines.h"
 #include "dxGeomMunger8.h"
 #include "config_gobj.h"
 #include "dxVertexBufferContext8.h"
@@ -2693,13 +2694,32 @@ begin_draw_primitives(const qpGeom *geom, const qpGeomMunger *munger,
       _vertex_blending_enabled = false;
     }
 
-    if (_transform_stale) {
+    if (_transform_stale && !_vertex_data->is_vertex_transformed()) {
       const D3DMATRIX *d3d_mat = (const D3DMATRIX *)_transform->get_mat().get_data();
       _pD3DDevice->SetTransform(D3DTS_WORLD, d3d_mat);
       _transform_stale = false;
     }
   }
 
+  if (_vertex_data->is_vertex_transformed()) {
+    // If the vertex data claims to be already transformed into clip
+    // coordinates, wipe out the current projection and modelview
+    // matrix (so we don't attempt to transform it again).
+
+    // It's tempting just to use the D3DFVF_XYZRHW specification on
+    // these vertices, but that turns out to be a bigger hammer than
+    // we want: that also prevents lighting calculations and user clip
+    // planes.
+    _pD3DDevice->SetTransform(D3DTS_WORLD, &matIdentity);
+    static const LMatrix4f rescale_mat
+      (1, 0, 0, 0,
+       0, 1, 0, 0,
+       0, 0, 0.5, 0,
+       0, 0, 0.5, 1);
+    _transform_stale = true;
+
+    _pD3DDevice->SetTransform(D3DTS_PROJECTION, (const D3DMATRIX *)rescale_mat.get_data());
+  }
 
   return true;
 }
@@ -2818,6 +2838,38 @@ draw_tristrips(const qpGeomTristrips *primitive) {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DXGraphicsStateGuardian8::draw_lines
+//       Access: Public, Virtual
+//  Description: Draws a series of disconnected line segments.
+////////////////////////////////////////////////////////////////////
+void DXGraphicsStateGuardian8::
+draw_lines(const qpGeomLines *primitive) {
+  _vertices_other_pcollector.add_level(primitive->get_num_vertices());
+  if (_vbuffer_active) {
+    IndexBufferContext *ibc = ((qpGeomPrimitive *)primitive)->prepare_now(get_prepared_objects(), this);
+    nassertv(ibc != (IndexBufferContext *)NULL);
+    apply_index_buffer(ibc);
+
+    _pD3DDevice->DrawIndexedPrimitive
+      (D3DPT_LINELIST,
+       primitive->get_min_vertex(),
+       primitive->get_max_vertex() - primitive->get_min_vertex() + 1,
+       0, primitive->get_num_primitives());
+
+  } else {
+    _pD3DDevice->DrawIndexedPrimitiveUP
+      (D3DPT_LINELIST, 
+       primitive->get_min_vertex(),
+       primitive->get_max_vertex() - primitive->get_min_vertex() + 1,
+       primitive->get_num_primitives(), 
+       primitive->get_flat_first_vertices(),
+       D3DFMT_INDEX16,
+       _vertex_data->get_array(0)->get_data(),
+       _vertex_data->get_format()->get_array(0)->get_stride());
+  }
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DXGraphicsStateGuardian8::end_draw_primitives()
 //       Access: Public, Virtual
@@ -2827,8 +2879,6 @@ draw_tristrips(const qpGeomTristrips *primitive) {
 ////////////////////////////////////////////////////////////////////
 void DXGraphicsStateGuardian8::
 end_draw_primitives() {
-  GraphicsStateGuardian::end_draw_primitives();
-
   // Turn off vertex blending--it seems to cause problems if we leave
   // it on.
   if (_vertex_blending_enabled) {
@@ -2836,6 +2886,13 @@ end_draw_primitives() {
     _pD3DDevice->SetRenderState(D3DRS_VERTEXBLEND, D3DVBF_DISABLE);
     _vertex_blending_enabled = false;
   }
+
+  if (_vertex_data->is_vertex_transformed()) {
+    // Restore the projection matrix that we wiped out above.
+    prepare_lens();
+  }
+
+  GraphicsStateGuardian::end_draw_primitives();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -3579,7 +3636,7 @@ issue_tex_gen(const TexGenAttrib *attrib) {
     //enable_texturing(false);
     // reset the texcoordindex lookup to 0
     //_pD3DDevice->SetTransform(D3DTS_TEXTURE0, (D3DMATRIX *)dm.get_data());
-    _pD3DDevice->SetTextureStageState(0, D3DTSS_TEXTURETRANSFORMFLAGS, 0);
+    //_pD3DDevice->SetTextureStageState(0, D3DTSS_TEXTURETRANSFORMFLAGS, 0);
     _pD3DDevice->SetTextureStageState( 0, D3DTSS_TEXCOORDINDEX, 0);
 
   } else if (attrib->get_mode(TextureStage::get_default()) == TexGenAttrib::M_eye_sphere_map) {
diff --git a/panda/src/dxgsg8/dxGraphicsStateGuardian8.h b/panda/src/dxgsg8/dxGraphicsStateGuardian8.h
index 7b4d4b0e7e..f50b939660 100644
--- a/panda/src/dxgsg8/dxGraphicsStateGuardian8.h
+++ b/panda/src/dxgsg8/dxGraphicsStateGuardian8.h
@@ -95,6 +95,7 @@ public:
                                      const qpGeomVertexData *vertex_data);
   virtual void draw_triangles(const qpGeomTriangles *primitive);
   virtual void draw_tristrips(const qpGeomTristrips *primitive);
+  virtual void draw_lines(const qpGeomLines *primitive);
   virtual void end_draw_primitives();
 
   virtual TextureContext *prepare_texture(Texture *tex);
diff --git a/panda/src/glstuff/glGeomMunger_src.cxx b/panda/src/glstuff/glGeomMunger_src.cxx
index f8292948ba..704d106981 100644
--- a/panda/src/glstuff/glGeomMunger_src.cxx
+++ b/panda/src/glstuff/glGeomMunger_src.cxx
@@ -49,8 +49,7 @@ munge_format_impl(const qpGeomVertexFormat *orig,
   PT(qpGeomVertexFormat) new_format = new qpGeomVertexFormat(*orig);
   new_format->set_animation(animation);
 
-  const qpGeomVertexColumn *color_type = 
-    orig->get_column(InternalName::get_color());
+  const qpGeomVertexColumn *color_type = orig->get_color_column();
   if (color_type != (qpGeomVertexColumn *)NULL &&
       color_type->get_numeric_type() == qpGeomVertexColumn::NT_packed_dabc) {
     // We need to convert the color format; OpenGL doesn't support the
diff --git a/panda/src/gobj/qpgeomVertexArrayFormat.cxx b/panda/src/gobj/qpgeomVertexArrayFormat.cxx
index 350ef27247..3a555b0969 100644
--- a/panda/src/gobj/qpgeomVertexArrayFormat.cxx
+++ b/panda/src/gobj/qpgeomVertexArrayFormat.cxx
@@ -417,7 +417,10 @@ write(ostream &out, int indent_level) const {
   for (dti = _columns.begin(); dti != _columns.end(); ++dti) {
     const qpGeomVertexColumn *column = (*dti);
     indent(out, indent_level + 2)
-      << *column << " start at " << column->get_start() << "\n";
+      << *column 
+      << " " << column->get_numeric_type()
+      << " " << column->get_contents()
+      << " start at " << column->get_start() << "\n";
   }
 }
 
diff --git a/panda/src/gobj/qpgeomVertexColumn.cxx b/panda/src/gobj/qpgeomVertexColumn.cxx
index c7fd1f8d13..033956618d 100644
--- a/panda/src/gobj/qpgeomVertexColumn.cxx
+++ b/panda/src/gobj/qpgeomVertexColumn.cxx
@@ -68,3 +68,56 @@ void qpGeomVertexColumn::
 output(ostream &out) const {
   out << *get_name() << "(" << get_num_components() << ")";
 }
+
+ostream &
+operator << (ostream &out, qpGeomVertexColumn::NumericType numeric_type) {
+  switch (numeric_type) {
+  case qpGeomVertexColumn::NT_uint8:
+    return out << "uint8";
+    
+  case qpGeomVertexColumn::NT_uint16:
+    return out << "uint16";
+    
+  case qpGeomVertexColumn::NT_packed_dcba:
+    return out << "packed_dcba";
+    
+  case qpGeomVertexColumn::NT_packed_dabc:
+    return out << "packed_dabc";
+    
+  case qpGeomVertexColumn::NT_float32:
+    return out << "float32";
+  }
+
+  return out << "**invalid numeric type (" << (int)numeric_type << ")**";
+}
+
+ostream &
+operator << (ostream &out, qpGeomVertexColumn::Contents contents) {
+  switch (contents) {
+  case qpGeomVertexColumn::C_other:
+    return out << "other";
+
+  case qpGeomVertexColumn::C_point:
+    return out << "point";
+
+  case qpGeomVertexColumn::C_clip_point:
+    return out << "clip_point";
+
+  case qpGeomVertexColumn::C_vector:
+    return out << "vector";
+
+  case qpGeomVertexColumn::C_texcoord:
+    return out << "texcoord";
+
+  case qpGeomVertexColumn::C_color:
+    return out << "color";
+
+  case qpGeomVertexColumn::C_index:
+    return out << "index";
+
+  case qpGeomVertexColumn::C_morph_delta:
+    return out << "morph_delta";
+  }
+
+  return out << "**invalid contents (" << (int)contents << ")**";
+}
diff --git a/panda/src/gobj/qpgeomVertexColumn.h b/panda/src/gobj/qpgeomVertexColumn.h
index a15c7e8537..6d14936ad3 100644
--- a/panda/src/gobj/qpgeomVertexColumn.h
+++ b/panda/src/gobj/qpgeomVertexColumn.h
@@ -95,6 +95,8 @@ private:
 };
 
 INLINE ostream &operator << (ostream &out, const qpGeomVertexColumn &obj);
+ostream &operator << (ostream &out, qpGeomVertexColumn::NumericType numeric_type);
+ostream &operator << (ostream &out, qpGeomVertexColumn::Contents contents);
 
 #include "qpgeomVertexColumn.I"
 
diff --git a/panda/src/gobj/qpgeomVertexReader.cxx b/panda/src/gobj/qpgeomVertexReader.cxx
index 705f67f6e6..0838157a39 100644
--- a/panda/src/gobj/qpgeomVertexReader.cxx
+++ b/panda/src/gobj/qpgeomVertexReader.cxx
@@ -83,6 +83,7 @@ qpGeomVertexReader::Reader *qpGeomVertexReader::
 make_reader() const {
   switch (_column->get_contents()) {
   case qpGeomVertexColumn::C_point:
+  case qpGeomVertexColumn::C_clip_point:
   case qpGeomVertexColumn::C_texcoord:
     // These types are read as a 4-d homogeneous point.
     switch (_column->get_numeric_type()) {
diff --git a/panda/src/gobj/qpgeomVertexWriter.cxx b/panda/src/gobj/qpgeomVertexWriter.cxx
index 8922126e6a..869141c0af 100644
--- a/panda/src/gobj/qpgeomVertexWriter.cxx
+++ b/panda/src/gobj/qpgeomVertexWriter.cxx
@@ -87,6 +87,7 @@ qpGeomVertexWriter::Writer *qpGeomVertexWriter::
 make_writer() const {
   switch (_column->get_contents()) {
   case qpGeomVertexColumn::C_point:
+  case qpGeomVertexColumn::C_clip_point:
   case qpGeomVertexColumn::C_texcoord:
     // These types are written as a 4-d homogeneous point.
     switch (_column->get_numeric_type()) {
diff --git a/panda/src/gsgbase/graphicsStateGuardianBase.h b/panda/src/gsgbase/graphicsStateGuardianBase.h
index 5113b3021a..0d7df9425f 100644
--- a/panda/src/gsgbase/graphicsStateGuardianBase.h
+++ b/panda/src/gsgbase/graphicsStateGuardianBase.h
@@ -209,6 +209,8 @@ public:
 
   virtual void apply_material(const Material *material)=0;
 
+  virtual CoordinateSystem get_internal_coordinate_system() const=0;
+
   virtual void issue_transform(const TransformState *) { }
   virtual void issue_alpha_test(const AlphaTestAttrib *) { }
   virtual void issue_color_scale(const ColorScaleAttrib *) { }
diff --git a/panda/src/pgraph/cullableObject.cxx b/panda/src/pgraph/cullableObject.cxx
index db60123cbc..4cc8de28fc 100644
--- a/panda/src/pgraph/cullableObject.cxx
+++ b/panda/src/pgraph/cullableObject.cxx
@@ -215,7 +215,8 @@ munge_points_to_quads(const CullTraverser *traverser) {
   const Lens *lens = scene->get_lens();
   const LMatrix4f &lens_mat = lens->get_projection_mat();
   LMatrix4f projection =
-    LMatrix4f::convert_mat(CS_yup_right, lens->get_coordinate_system()) *
+    LMatrix4f::convert_mat(gsg->get_internal_coordinate_system(), 
+                           lens->get_coordinate_system()) *
     lens_mat;
 
   LMatrix4f render_transform;