Support structures for complex entity collision,

renamed sv_arrysize cvar to mem_vertex.

11 files changed, 344 insertions, 98 deletions

diff --git a/src/model/Makefile.am b/src/model/Makefile.am
index 3d9d7c0..cba5c48 100644
--- a/src/model/Makefile.am
+++ b/src/model/Makefile.am
@@ -5,6 +5,7 @@ INCLUDES = -I$(top_srcdir)/src
 noinst_LTLIBRARIES = libmodel.la
 noinst_HEADERS = \
 	asefile.h \
+	collisionmesh.h \
 	face.h \
 	fragment.h \
 	mapfile.h \
@@ -18,6 +19,7 @@ noinst_HEADERS = \
 
 libmodel_la_SOURCES = \
 	asefile.cc \
+	collisionmesh.cc \
 	face.cc \
 	fragment.cc \
 	mapfile.cc \
diff --git a/src/model/collisionmesh.cc b/src/model/collisionmesh.cc
new file mode 100644
index 0000000..616ee0d
--- /dev/null
+++ b/src/model/collisionmesh.cc
@@ -0,0 +1,76 @@
+/*
+   model/collisionmesh.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "sys/sys.h"
+#include "model/collisionmesh.h"
+
+namespace model {
+
+CollisionMesh::Registry	CollisionMesh::collisionmesh_registry;
+bool CollisionMesh::collisionmesh_initialized = false;
+
+void CollisionMesh::init()
+{
+	clear();
+	collisionmesh_initialized = true;
+}
+
+void CollisionMesh::shutdown()
+{
+	clear();
+	collisionmesh_initialized = false;
+}
+
+void CollisionMesh::add(CollisionMesh *collisionmesh)
+{
+	collisionmesh_registry[collisionmesh->name()] = collisionmesh;	
+}
+
+void CollisionMesh::clear()
+{
+	con_debug << "  clearing collision meshes" << std::endl;
+
+	for (Registry::iterator i = collisionmesh_registry.begin(); i != collisionmesh_registry.end(); ++i) {
+		delete(*i).second;
+	}
+
+	collisionmesh_registry.clear();
+}
+
+CollisionMesh *CollisionMesh::find(const std::string &name)
+{
+	for (Registry::iterator i = collisionmesh_registry.begin(); i != collisionmesh_registry.end(); ++i) {
+		if ((*i).first.compare(name) == 0)
+			return (*i).second;
+	}
+	
+	return 0;
+}
+
+CollisionMesh::CollisionMesh(const std::string &name) :
+	collisionmesh_name(name)
+{
+	collisionmesh_size = 0;
+	// btTriangleMesh (bool use32bitIndices=true, bool use4componentVertices=true)
+	collisionmesh_triangles = new btTriangleMesh(true, false);
+}
+
+CollisionMesh::~CollisionMesh()
+{
+	delete collisionmesh_triangles;
+}
+
+void CollisionMesh::add_triangle(const math::Vector3f & v0, const math::Vector3f & v1, const math::Vector3f & v2)
+{
+	collisionmesh_triangles->addTriangle(
+		to_btVector3(v0),
+		to_btVector3(v1),
+		to_btVector3(v1)
+	);
+	collisionmesh_size += 1;
+}
+
+} // namespace model
diff --git a/src/model/collisionmesh.h b/src/model/collisionmesh.h
new file mode 100644
index 0000000..9efd21a
--- /dev/null
+++ b/src/model/collisionmesh.h
@@ -0,0 +1,102 @@
+/*
+   model/collisionmesh.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#ifndef __INCLUDED_MODEL_COLLISIONMESH_H__
+#define __INCLUDED_MODEL_COLLISIONMESH_H__
+
+#include "math/mathlib.h"
+
+#include "BulletCollision/CollisionShapes/btTriangleMesh.h"
+
+#include <string>
+#include <map>
+
+namespace model
+{
+
+class CollisionMesh
+{
+public:
+
+	/// type definition for the material registry
+	typedef std::map<std::string, CollisionMesh *> Registry;
+
+	CollisionMesh(const std::string &name);
+
+	~CollisionMesh();
+
+	/* ---- inspectors ----------------------------------------- */
+
+	inline const std::string &name() const {
+		return collisionmesh_name;
+	}
+	
+	/**
+	 * @brief the number of triangles in the collision mesh
+	 */
+	inline size_t size() const {
+		return collisionmesh_size;
+	}
+	
+	static bool initialized() {
+			return collisionmesh_initialized;
+	}
+	
+	/**
+	 * @brief the bullet triangle mesh object
+	 */
+	inline btTriangleMesh *triangles() {
+		return collisionmesh_triangles;
+	}
+	
+	/* ---- mutators ------------------------------------------- */
+	
+	/**
+	 *  @brief add a triangle to the collision mesh
+	 */
+	void add_triangle(const math::Vector3f & v0, const math::Vector3f & v1, const math::Vector3f & v2);
+
+	/* ---- static ----------------------------------------------------- */
+
+	/**
+	 * @brief initialize collisionmesh registry
+	 */
+	static void init();
+
+	/**
+	 * @brief shutdown collisionmesh registry
+	 */
+	static void shutdown();
+
+	/**
+	 * @brief clear collisionmesh registry
+	 */
+	static void clear();
+
+	/**
+	 * @brief find a collisionmesh in the registry
+	 */
+	static CollisionMesh *find(const std::string &name);
+
+	/**
+	 * @brief add a collisionmesh to the registry
+	 */
+	static void add(CollisionMesh *collisionmesh);
+	
+private:
+
+	/// the materials registry
+	static Registry			collisionmesh_registry;
+	static bool			collisionmesh_initialized;
+	
+	std::string			collisionmesh_name;
+	size_t				collisionmesh_size;
+	btTriangleMesh			*collisionmesh_triangles;
+};
+
+} // namespace model
+
+#endif // __INCLUDED_MODEL_COLLISIONMESH_H__
diff --git a/src/model/mapfile.cc b/src/model/mapfile.cc
index 5e18a0d..bfe19c0 100644
--- a/src/model/mapfile.cc
+++ b/src/model/mapfile.cc
@@ -7,6 +7,7 @@
 #include "auxiliary/functions.h"
 #include "filesystem/filesystem.h"
 #include "math/mathlib.h"
+#include "model/collisionmesh.h"
 #include "model/mapfile.h"
 #include "model/material.h"
 #include "model/model.h"
@@ -147,6 +148,8 @@ MapFile::MapFile()
 	map_brushes = 0;
 	map_faces = 0;
 	map_faces_detail = 0;
+	
+	map_load_clip = false;
 
 	in_patchdef = false;
 	warning_q2brush = false;
@@ -924,32 +927,36 @@ void MapFile::make_brushface(Face *face)
 		Vector3f face_normal(face->normal()* -1);
 		face_normal.normalize();
 
-		// split polygon into quads
-		while (vl.size() > 3) {
-			std::vector<Vector3f *>::iterator v0 = vl.begin();
-			std::vector<Vector3f *>::reverse_iterator vn = vl.rbegin();
-			std::vector<Vector3f *>::reverse_iterator vn1 = vl.rbegin();
-			++vn1;
-			std::vector<Vector3f *>::reverse_iterator vn2 = vl.rbegin();
-			++vn2;
-			++vn2;
-
-			Quad *quad = new Quad(*(*vn2) * SCALE, *(*vn1) * SCALE, *(*vn) * SCALE, *(*v0) * SCALE, face_normal, face->detail());
-			primitives->add_quad(quad);
+		// clip faces have to be triangulated and can not be split into quads
+		if (!(face->material()->flags() & Material::Clip)) {
+			
+			// split polygon into quads
+			while (vl.size() > 3) {
+				std::vector<Vector3f *>::iterator v0 = vl.begin();
+				std::vector<Vector3f *>::reverse_iterator vn = vl.rbegin();
+				std::vector<Vector3f *>::reverse_iterator vn1 = vl.rbegin();
+				++vn1;
+				std::vector<Vector3f *>::reverse_iterator vn2 = vl.rbegin();
+				++vn2;
+				++vn2;
+
+				Quad *quad = new Quad(*(*vn2) * SCALE, *(*vn1) * SCALE, *(*vn) * SCALE, *(*v0) * SCALE, face_normal, face->detail());
+				primitives->add_quad(quad);
+
+				if (face->material()->flags() & Material::Texture) {
+					quad->t0().assign(map_texture_coords(face, *(*vn2)));
+					quad->t1().assign(map_texture_coords(face, *(*vn1)));
+					quad->t2().assign(map_texture_coords(face, *(*vn)));
+					quad->t3().assign(map_texture_coords(face, *(*v0)));
+				}
 
-			if (face->material()->flags() & Material::Texture) {
-				quad->t0().assign(map_texture_coords(face, *(*vn2)));
-				quad->t1().assign(map_texture_coords(face, *(*vn1)));
-				quad->t2().assign(map_texture_coords(face, *(*vn)));
-				quad->t3().assign(map_texture_coords(face, *(*v0)));
+				delete(*vn);
+				delete(*vn1);
+				vl.pop_back();
+				vl.pop_back();
 			}
-
-			delete(*vn);
-			delete(*vn1);
-			vl.pop_back();
-			vl.pop_back();
 		}
-
+		
 		// split polygon into triangles
 		while (vl.size() > 2) {
 			std::vector<Vector3f *>::iterator v0 = vl.begin();
@@ -965,11 +972,12 @@ void MapFile::make_brushface(Face *face)
 				triangle->t1().assign(map_texture_coords(face, *(*vn)));
 				triangle->t2().assign(map_texture_coords(face, *(*v0)));
 			}
+			
 			delete(*vn);
 			vl.pop_back();
 		}
 	} else {
-		con_warn << name() << " unresolved face at line " << line() << std::endl;
+		con_warn << name() << " unresolved brush face at line " << line() << std::endl;
 	}
 
 	// clean up the vertex list
@@ -1170,38 +1178,47 @@ void MapFile::load_fragmentgroup(Model *model, const FragmentGroup::Type class_t
 
 		// store triangles
 		if (primitives->triangles().size()) {
-			Fragment *fragment = new Fragment(Fragment::Triangles, primitives->material());
-
-			// add structural triangles to the fragment
-			for (Primitives::Triangles::iterator tris_it = primitives->triangles().begin(); tris_it != primitives->triangles().end(); tris_it++) {
-				Triangle  *triangle = (*tris_it);
-				if (!triangle->detail()) {
-					size_t count = 0;
-					count += fragment->add_vertex(triangle->v0() - translation, triangle->normal(), triangle->t0(), false);
-					count += fragment->add_vertex(triangle->v1() - translation, triangle->normal(), triangle->t1(), false);
-					count += fragment->add_vertex(triangle->v2() - translation, triangle->normal(), triangle->t2(), false);
-					if (count == 3)
-						model->model_tris_count++;
+			if (!(primitives->material()->flags() & Material::Clip)) {
+				Fragment *fragment = new Fragment(Fragment::Triangles, primitives->material());
+
+				// add structural triangles to the fragment
+				for (Primitives::Triangles::iterator tris_it = primitives->triangles().begin(); tris_it != primitives->triangles().end(); tris_it++) {
+					Triangle  *triangle = (*tris_it);
+					if (!triangle->detail()) {
+						size_t count = 0;
+						count += fragment->add_vertex(triangle->v0() - translation, triangle->normal(), triangle->t0(), false);
+						count += fragment->add_vertex(triangle->v1() - translation, triangle->normal(), triangle->t1(), false);
+						count += fragment->add_vertex(triangle->v2() - translation, triangle->normal(), triangle->t2(), false);
+						if (count == 3)
+							model->model_tris_count++;
+					}
 				}
-			}
 
-			// add detail triangles to the fragment
-			for (Primitives::Triangles::iterator tris_it = primitives->triangles().begin(); tris_it != primitives->triangles().end(); tris_it++) {
-				Triangle  *triangle = (*tris_it);
-				if (triangle->detail()) {
-					size_t count = 0;
-					count += fragment->add_vertex(triangle->v0() - translation, triangle->normal(), triangle->t0(), true);
-					count += fragment->add_vertex(triangle->v1() - translation, triangle->normal(), triangle->t1(), true);
-					count += fragment->add_vertex(triangle->v2() - translation, triangle->normal(), triangle->t2(), true);
-					if (count == 3) {
-						model->model_tris_count++;
-						model->model_tris_detail_count++;
+				// add detail triangles to the fragment
+				for (Primitives::Triangles::iterator tris_it = primitives->triangles().begin(); tris_it != primitives->triangles().end(); tris_it++) {
+					Triangle  *triangle = (*tris_it);
+					if (triangle->detail()) {
+						size_t count = 0;
+						count += fragment->add_vertex(triangle->v0() - translation, triangle->normal(), triangle->t0(), true);
+						count += fragment->add_vertex(triangle->v1() - translation, triangle->normal(), triangle->t1(), true);
+						count += fragment->add_vertex(triangle->v2() - translation, triangle->normal(), triangle->t2(), true);
+						if (count == 3) {
+							model->model_tris_count++;
+							model->model_tris_detail_count++;
+						}
 					}
 				}
-			}
 
-			// add the fragment to the group
-			group->add_fragment(fragment);
+				// add the fragment to the group
+				group->add_fragment(fragment);
+				
+			} else if (map_load_clip) {
+				// clip materials are loaded into the CollisionArray
+				for (Primitives::Triangles::iterator tris_it = primitives->triangles().begin(); tris_it != primitives->triangles().end(); tris_it++) {
+					Triangle  *triangle = (*tris_it);					
+					model->collisionmesh()->add_triangle(triangle->v0(), triangle->v1(), triangle->v2());
+				}
+			}
 		}
 
 		// store quads
@@ -1309,9 +1326,23 @@ Model * MapFile::load(std::string const &name)
 	unsigned int u;
 	float r, s;
 	std::string str;
+	
+	// load clip into collision mesh
+	// if the model has been loaded before (e.g. on r_restart), the collision mesh won't be reloaded 
+	// submodel clip will not be imported
+	model->set_collisionmesh(CollisionMesh::find(name));
+	
+	if (CollisionMesh::initialized() && !model->collisionmesh()) {
+		mapfile.map_load_clip = true;
+		
+		// create a collision mesh instance for the model
+		model->set_collisionmesh(new CollisionMesh(name));
+		
+	} else {
+		mapfile.map_load_clip = false;
+	}
 
 	while (mapfile.getline()) {
-
 		if (mapfile.got_classname("worldspawn")) {
 			mapfile.clear_bbox();
 
@@ -1861,6 +1892,17 @@ Model * MapFile::load(std::string const &name)
 	model->model_tris_detail_count << "/" << model->model_tris_count << " detail/tris " <<
 	model->model_quad_detail_count << "/" << model->model_quad_count << " detail/quads" << std::endl;
 
+	if (mapfile.map_load_clip) {
+		if (!model->collisionmesh()->size()) {
+			// delete empty collision meshes
+			delete model->collisionmesh();
+			model->set_collisionmesh(0);
+		} else {
+			// add the collision mesh to the registry
+			CollisionMesh::add(model->collisionmesh());
+			con_debug << "  " << mapfile.name() << " " << model->collisionmesh()->size() << " collision triangles" << std::endl;
+		}
+	}
 
 	return model;
 }
diff --git a/src/model/mapfile.h b/src/model/mapfile.h
index 5e4bfd8..ed63ad2 100644
--- a/src/model/mapfile.h
+++ b/src/model/mapfile.h
@@ -181,6 +181,8 @@ private:
 	bool 			last_read_was_key;
 	bool 			last_read_was_classname;
 	bool			last_read_was_classend;
+	
+	bool			map_load_clip;
 
 	unsigned int		map_brushes;
 	unsigned int		map_faces;
diff --git a/src/model/material.cc b/src/model/material.cc
index 6baf4f9..2cacf42 100644
--- a/src/model/material.cc
+++ b/src/model/material.cc
@@ -188,15 +188,20 @@ void Material::load_shader(const std::string &shadername)
 					material->set_flags(Tertiary);
 				} else if (firstword.compare("ignore") == 0) {
 					material->set_flags(Ignore);
+				} else if (firstword.compare("clip") == 0) {
+					material->set_flags(Clip);
 				} else if (firstword.compare("qer_editorimage") == 0) {
+					// keyword qer_editorimage is ignored
 					continue;
 				} else if (firstword.compare("qer_trans") == 0) {
+					// keyword qer_trans is ignored
+					continue;
+				} else if (firstword.compare("surfaceparm") == 0) {
+					// keyword surfaceparm is ignored
 					continue;
 				} else if (firstword.compare("texture") == 0) {
-
 					// texture name should not contain spaces
 					if (linestream >> firstword) {
-
 						// remove extension
 						if (firstword[firstword.size()-4] == '.') {
 							firstword.erase(firstword.size() - 4);
diff --git a/src/model/material.h b/src/model/material.h
index 44470e5..3c0ccf1 100644
--- a/src/model/material.h
+++ b/src/model/material.h
@@ -24,7 +24,7 @@ public:
 	typedef void(* LoaderFuncPtr)(Material *);
 
 	/// surface flags
-	enum SurfaceFlags { None = 0, Primary = 1, Secondary = 2, Tertiary = 3, Bright = 4, Engine = 8, Environment = 16, Texture = 32, Ignore = 64};
+	enum SurfaceFlags { None = 0, Primary = 1, Secondary = 2, Tertiary = 3, Bright = 4, Engine = 8, Environment = 16, Texture = 32, Ignore = 64, Clip = 128};
 
 	/// type definition for the material registry
 	typedef std::map<std::string, Material *> Registry;
diff --git a/src/model/model.cc b/src/model/model.cc
index fb33bd0..d1805df 100644
--- a/src/model/model.cc
+++ b/src/model/model.cc
@@ -1,5 +1,5 @@
 /*
-   render/model.h
+   render/model.cc
    This file is part of the Osirion project and is distributed under
    the terms of the GNU General Public License version 2
 */
@@ -29,6 +29,8 @@ Model::Model(const std::string & name) :
 	model_tris_count = 0;
 	model_quad_detail_count = 0;
 	model_quad_count = 0;
+	
+	model_collisionmesh = 0;
 }
 
 Model::~Model()
@@ -70,6 +72,11 @@ Model::~Model()
 	model_sounds.clear();
 }
 
+void Model::set_collisionmesh(CollisionMesh *collisionmesh)
+{	model_collisionmesh = collisionmesh;
+	
+}
+
 void Model::set_origin(const math::Vector3f &origin)
 {
 	model_origin.assign(origin);
diff --git a/src/model/model.h b/src/model/model.h
index d3973c9..8e3d82d 100644
--- a/src/model/model.h
+++ b/src/model/model.h
@@ -13,6 +13,7 @@
 
 #include "math/mathlib.h"
 
+#include "model/collisionmesh.h"
 #include "model/tags.h"
 #include "model/fragment.h"
 
@@ -75,6 +76,10 @@ public:
 		return model_groups;
 	}
 
+	inline CollisionMesh *collisionmesh() {
+		return model_collisionmesh;
+	}
+	
 	/// list of model light tags
 	inline Lights & lights() {
 		return model_lights;
@@ -145,6 +150,9 @@ public:
 	/// set model radius
 	void set_radius(const float radius);
 	
+	/// set model collision mesh
+	void set_collisionmesh(CollisionMesh *collisionmesh);
+	
 	/// set model origin
 	void set_origin(const math::Vector3f &origin);
 	
@@ -198,6 +206,7 @@ private:
 	Groups			model_groups;
 	float			model_radius;
 	static Registry 	model_registry;
+	CollisionMesh		*model_collisionmesh;
 };
 
 }
diff --git a/src/model/vertexarray.cc b/src/model/vertexarray.cc
index d06b976..881e266 100644
--- a/src/model/vertexarray.cc
+++ b/src/model/vertexarray.cc
@@ -14,37 +14,39 @@
 namespace model
 {
 
-VertexArray *VertexArray::vertex_instance = 0 ;
+VertexArray *VertexArray::vertexarray_instance = 0 ;
 
 VertexArray::VertexArray(size_t size)
 {
-	vertex_instance = this;
+	assert(size > 0);
+	
+	vertexarray_instance = this;
 
-	vertex_size = size * 1024 * 1024;		// megabytes
-	vertex_size = vertex_size / sizeof(float);	// sizeof float
+	vertexarray_size = size * 1024 * 1024;		// megabytes
+	vertexarray_size = vertexarray_size / sizeof(float);	// sizeof float
 	
-	vertex_data = (float *) malloc(vertex_size * sizeof(float));
+	vertexarray_data = (float *) malloc(vertexarray_size * sizeof(float));
 
 	con_print << "^BInitializing vertex array..." << std::endl;
-	con_print << "  " << (vertex_size * sizeof(float)) / (1024 * 1024) << " Mb allocated" << std::endl;
+	con_print << "  " << (vertexarray_size * sizeof(float)) / (1024 * 1024) << " Mb allocated" << std::endl;
 
 	clear();
 }
 
 VertexArray::~VertexArray()
 {
-	free(vertex_data);
+	free(vertexarray_data);
 
-	vertex_instance = 0 ;
+	vertexarray_instance = 0 ;
 }
 
 void VertexArray::clear()
 {
-	vertex_dirty = true;
-	vertex_index = 0;
-	vertex_overflow = false;
+	vertexarray_dirty = true;
+	vertexarray_index = 0;
+	vertexarray_overflow = false;
 
-	memset(vertex_data, 0, sizeof(vertex_data));
+	memset(vertexarray_data, 0, sizeof(vertexarray_data));
 
 	add_sphere();
 }
@@ -106,10 +108,10 @@ void VertexArray::add_sphere()
 size_t VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n, float tex_x, float tex_y)
 {
 
-	if (vertex_index + 8 >= vertex_size) {
-		if (!vertex_overflow) {
+	if (vertexarray_index + 8 >= vertexarray_size) {
+		if (!vertexarray_overflow) {
 			con_warn << "VertexArray overflow!" << std::endl;
-			vertex_overflow = true;
+			vertexarray_overflow = true;
 		}
 		return 0;
 	}
@@ -117,19 +119,19 @@ size_t VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n,
 	// GL_T2F_N3F_V3F
 	
 	// texture coordinates
-	vertex_data[vertex_index] = tex_x;
-	vertex_data[vertex_index+1] = tex_y;
+	vertexarray_data[vertexarray_index] = tex_x;
+	vertexarray_data[vertexarray_index+1] = tex_y;
 
 	for (int i = 0; i < 3; i ++) {
 		// normal
-		vertex_data[vertex_index+2+i] = n[i];
+		vertexarray_data[vertexarray_index+2+i] = n[i];
 		// vertex coordinates
-		vertex_data[vertex_index+5+i] = v[i];
+		vertexarray_data[vertexarray_index+5+i] = v[i];
 	}
 	
-	vertex_index += 8;
+	vertexarray_index += 8;
 	
-	vertex_dirty = true;
+	vertexarray_dirty = true;
 
 	return 1;
 }
@@ -138,9 +140,9 @@ void VertexArray::info() {
 	const size_t mbfl = 1024 * 1024 / sizeof(float);
 
 	con_print << "  vertex array "
-		<< vertex_index / mbfl << "/" << vertex_size / mbfl << "Mib "
-		<< vertex_index / 8 << "/" << vertex_size / 8 << " verts "
-		<< "^B" << vertex_index * 100 / vertex_size << "%^N used" << std::endl;
+		<< vertexarray_index / mbfl << "/" << vertexarray_size / mbfl << "Mib "
+		<< vertexarray_index / 8 << "/" << vertexarray_size / 8 << " verts "
+		<< "^B" << vertexarray_index * 100 / vertexarray_size << "%^N used" << std::endl;
 }
 
 }
diff --git a/src/model/vertexarray.h b/src/model/vertexarray.h
index 9a71811..1474c67 100644
--- a/src/model/vertexarray.h
+++ b/src/model/vertexarray.h
@@ -15,7 +15,7 @@ namespace model
 // number of segments in a sphere circle, must be uneven
 const int SPHERESEGMENTS = 65;
 
-/// global vertex array
+/// global geometry vertex array
 /** a VertexArray acts like a stack of model vertices, it has no knowledge of what it is holding
  */
 class VertexArray
@@ -35,51 +35,50 @@ public:
 
 	/// true when the array is full
 	inline bool overflow() const {
-		return vertex_overflow;
+		return vertexarray_overflow;
 	}
 	
 	/// return true if the vertex data has changed and needs to uploaded to video memory
 	inline bool dirty() const {
-		return vertex_dirty;
+		return vertexarray_dirty;
 	}
 	
 	/// pointer to model vertices, sequential in GL_T2F_N3F_V3F format
 	inline const float *ptr() const {
-		return vertex_data;
+		return vertexarray_data;
 	}
 
 	/// size of the vertex array in number of floats (for a single array)
 	inline size_t size() const {
-		return vertex_size;
+		return vertexarray_size;
 	}
 
 	/// number of allocated floats
 	inline size_t index() const {
-		return vertex_index;
+		return vertexarray_index;
 	}
 	
 	inline void set_dirty(const bool dirty = true) {
-		vertex_dirty = dirty;
+		vertexarray_dirty = dirty;
 	}
 
 	static inline VertexArray *instance() {
-		return vertex_instance;
+		return vertexarray_instance;
 	}
 
 private:
-	/// model vertices, sequential in GL_T2F_N3F_V3F format
-	float *vertex_data;
-
-	size_t vertex_index;
-	size_t vertex_size;
-
 	void add_sphere();
+	
+	size_t vertexarray_index;
+	size_t vertexarray_size;
+	
+	/// model vertices, sequential in GL_T2F_N3F_V3F format
+	float *vertexarray_data;
 
-	static VertexArray *vertex_instance;
-
-	bool vertex_overflow;
+	bool vertexarray_overflow;
+	bool vertexarray_dirty;
 	
-	bool vertex_dirty;
+	static VertexArray *vertexarray_instance;
 };
 
 }