3DS parsing tutorial

Genjix · 2005-04-18T07:18:40

Please pm me any corrections and suggestions, and I'll edit this (I'm open to criticism)... Don't be shy. there seems to be a lot of questions, regarding 3ds loading and since Ranger_One has started writing a tutorial on obj loading I thought I might as well do the same. first of all I would recommend wavefront's obj format over 3ds, for several reasons obj reasons Its in a human readable format, so you can use a simple text editor to make changes to the file. Its a lot more logical, compared to the irratic structure of a 3ds file There is no redundant data. 3ds reasons Binary format, therefore it is faster to load, and is smaller. But there are always people who want to prehaps convert a 3ds file, to their own personal format and 3ds is also a VERY popular format (prehaps even more so than max file format!). The first and foremost thing to remember about the 3ds file, is that everything is ordered hierachially like in xml. <root> <materials> <brickwall> // ... </brickwall> <mutantskin> // ... </mutantskin> </materials> <meshes> <wall> <texture name="brickwall"> // face list </texture> <facelist> <face a="10" b="20" c="8" /> // other faces </facelist> <vertexlist> <vertex x="120" y="320" z="2" /> // other vertices </vertexlist> // other details like uv coords .etc </wall> // other meshes </meshes> </root> above you will see a highly simplified version of what I mean. in 3ds however the tags are replaced by chunk headers. Everything in 3ds is organized into chunks. In the example above a chunk would be root, meshes, vertexlist .etc A chunk header takes the form chunk_beginning_adress: [Chunk ID - 2 bytes] [next Chunk offset from 'chunk_beginning_adress' - 4 bytes] // ... data second_chunk_beginning_adress: [Chunk ID - 2 bytes] [next Chunk offset from 'second_chunk_beginning_adress' - 4 bytes] // ... data not only that, but chunks can be nested. c00: [Chunk ID - 2 bytes] [next Chunk offset from c00 - 4 bytes] // data before sub-chunks c01: [Chunk ID - 2 bytes] [next Chunk offset from c01 - 4 bytes] c02: [Chunk ID - 2 bytes] [next Chunk offset from c02 - 4 bytes] // ... c02 data, then sub-chunks c10: [Chunk ID - 2 bytes] [next Chunk offset from c10 - 4 bytes] // ... reading chunks is trivial. lets say, we opened the 3ds file, read the first 2 bytes and realized its not the chunk we want to parse? well, we simply read the next 4 bytes and jump c00 + offset (this is why it is important to store your offset in the file before reading the chunk id's). Even better lets say we read the first chunk under c00, and realized that c01 is not a chunk we are parsing? well we simply read the next 4 bytes, and jump c01 + offset, placing us right before c02's chunk id (at the point its good to store your new offset within the file). Chunk ID's are the equivalent to tag names under xml. Also a side note, the data under chunks ALWAYS comes before the sub-chunks. OK, so lets parse a 3ds file :) lets give you the part of the 3ds file you will parse (you will of course need a 3ds file). we are just going to read a few chunk headers. <main3ds> // no data under root chunk <version /> <editor3d /> </main3ds> we are going to read main3ds chunk, then start reading version sub-chunk, then skip to editor 3d chunk. #include <fstream> #include <iostream> using namespace std; int main(int argc , char **argv) { if(argc < 2) return -1; ifstream file(argv[1] , ios::binary); short id; // hopefully short is 2 bytes on your system int length; // and an int is 4 bytes :) int chunk_beginning; // main3ds file.read((char*)&id , 2); cout << "id = (" << hex << id << ")\n"; file.read((char*)&length , 4); cout << "length = (" << dec << length << ")\n\n"; // version chunk_beginning = file.tellg(); file.read((char*)&id , 2); cout << "id = (" << hex << id << ")\n"; file.read((char*)&length , 4); cout << "length = (" << dec << length << ")\n\n"; // 3d editor chunk cout << "(chunk_beginning + offset) = (" << chunk_beginning + length << ")\n"; file.seekg(chunk_beginning + length); file.read((char*)&id , 2); cout << "id = (" << hex << id << ")\n"; file.read((char*)&length , 4); cout << "length = (" << dec << length << ")\n"; return 0; } the output is: genjix@linux:~/media/tmp> ./notniceparser heavy.3ds id = (4d4d) length = (37624) id = (2) length = (10) (chunk_beginning + offset) = (16) id = (3d3d) length = (37608) i should mention that I spent a long time, searching for a bug when i ported my parser to win32 - tellg() returns strange results without the ios::binary flag :S some 3ds files may have different output with the above program, so get a different 3ds file (all the 3ds files ive tested so far, have given same result, but they may have a different chunk ordering). No this is all well and good, but its not a nice way to parse a 3ds file :/ Taking our comparison with xml, most xml parsers work like this <main3ds> // no data under root chunk <version /> <editor3d /> </main3ds> Xml::Document doc("doc.xml"); Xml::Element root = doc.Child(); if(root.Name() == "main3ds") { for(Xml::Element child = root.Child() ; child ; child = child.Sibling()) { // i know switches only work on integral types // this is semi-pseudo code switch(child.Name()) { case("version"): cout << "id = (" << child.ID() << ")\n"; cout << "length = (" << child.Length() << ")\n"; // do stuff break; case("editor3d"): cout << "id = (" << child.ID() << ")\n"; cout << "length = (" << child.Length() << ")\n"; // do stuff break; } } } else { // parse error! } this is how the above example could be coded in our imaginary world. You may complain how that is longer and more lines, but that sure as hell, is easier to understand. Now imagine that instead of strings and names we had shorts and ID's. That would then become. Model3DSFile doc("doc.xml"); Model3DSChunk root = doc.Child(); if(root.ID() == 0x4d4d) // main3ds { for(Model3DSChunk child = root.Child() ; child ; child = child.Sibling()) { // i know switches only work on integral types // this is semi-pseudo code switch(child.ID()) { case(0x0002): // version cout << "id = (" << child.ID() << ")\n"; cout << "length = (" << child.Length() << ")\n"; // do stuff break; case(0x3d3d): // editor3d cout << "id = (" << child.ID() << ")\n"; cout << "length = (" << child.Length() << ")\n"; // do stuff break; } } } else { // parse error! } to keep you happy, here are the header files for Model3DSFile and Model3DSChunk, until my next tutorial. #ifndef FILE_H #define FILE_H #include <fstream> #include "chunk.h" /***/ class Model3DSFile { public: /***/ Model3DSFile(const char *src); /***/ ~Model3DSFile(); Model3DSChunk Child(); private: static int FileSize(std::ifstream &file); std::ifstream file; }; #endif #ifndef CHUNK_H #define CHUNK_H #include <fstream> #include <string> /***/ class Model3DSChunk { public: /***/ Model3DSChunk(std::ifstream &infile , int csend); /***/ Model3DSChunk(const Model3DSChunk &chunk); /***/ ~Model3DSChunk(); /**bug : making 2 seperate file stream chunks = each other*/ void operator=(const Model3DSChunk &chunk); operator bool(); int ID(); short Short(); int Int(); float Float(); std::string Str(); Model3DSChunk Child(); Model3DSChunk Sibling(); private: std::ifstream &file int chunkset_end; int id , begin , end; }; #endif [Edited by - Genjix on April 15, 2005 6:50:55 AM]

Graphics and GPU Programming Programming

Started by Genjix April 13, 2005 08:14 AM

16 comments, last by Genjix 19 years, 7 months ago

Genjix

Author

100

April 16, 2005 05:35 AM

ok so here is the 3ds structure we are going to parse

string - nul terminated byte setshort  - 2 byteint    - 4 bytefloat  - 4 byte<root>	<version 0x0002>		int version;	</version>		<editor3d 0x3d3d>		<meshversion 0x3d3e>			int meshversion;		</meshversion>				<editmaterial 0xafff>			// look below		</editmaterial>				<editobject 0x4000>			string objectname;			// look below		</editobject>	</editor3d></root>

edit material chunk (0xafff)

<editmaterial 0xafff>	<materialname 0xa000>		string materialname;	</materialname>				<shininesspercent 0xa040>		// either a 0x0030 or 0x0031 chunk		<percentint 0x0030>			int percent;		</percentint>		<percentfloat 0x0030>			int percent;		</percentfloat>	</shininesspercent>				<transparencypercent 0xa050>		// either a 0x0030 or 0x0031 chunk		<percentint 0x0030>			int percent;		</percentint>		<percentfloat 0x0030>			int percent;		</percentfloat>	</transparencypercent>				<texturemap1 0xa200>		<texturesource 0xa300>			string imagesrc;		</texturesource>	</texturemap1>				<texturemap2 0xa200>		<texturesource 0xa300>			string imagesrc;		</texturesource>	</texturemap2></editmaterial>

edit object chunk (0x4000)

<editobject 0x4000>	string objectname;	// these child chunks, decide what this object is	<trianglemesh 0x4100>		// objects transform matrix (4x3 - last row is 0 0 0 1)		<localcoordinatesystemmatrix 0x4160>			// 12 floats - go figure			float x00;			float x01;			...		</localcoordinatesystemmatrix>				<vertexlist 0x4110>			short numberofvertices;						float x;			float y;			float z;			// ... repeat numberofvertices times;		</vertexlist>				<texturecoordlist>			short numberoftexcoords;						float u;			float v;			// ... repeat numberoftexcoords times		</texturecoordlist>				<facelist>			short numberoffaces;						float va;	// index to vertex array			float vb;			float vc;			// ... repeat numberoffaces times						<facesmaterials 0x4130>				string materialname;				short numberoffaces;								short face;				// ... repeat numberoffaces times			</facesmaterials>		</facelist>	</trianglemesh>		<light 0x4600>		float x;		float y;		float z;				/* finding this means this is a spotlight		not an omni */		<spotlight 0x4610>			float targetx;			float targety;			float targetz;		</spotlight>	</light>		<camera 0x4700>		// i am going to ignore this	</camera></editobject>

also note that multiple objects exist as multiple editobject chunks, not multiple trianglemesh chunks (which is why objectname is in editobject chunk).

These are the things we will be parsing.
So, here in a list as well -

lights

materials

meshes

(im considering doing fog support)

And things it will not support

camera's

keyframing info

also note that the parser stores scene info internally using stl as it is a parser NOT a renderer (the info is meant to be read into the scenegraph, not used in the scenegraph).

[Edited by - Genjix on April 16, 2005 12:35:49 PM]

Genjix

Author

100

April 16, 2005 12:15 PM

#ifndef SCENE3DS_H#define SCENE3DS_H#include <string>#include "light/light3ds.h"#include "material/material3ds.h"#include "mesh/mesh3ds.h"/***/class Scene3DS : public Light3DS , public Material3DS , public Mesh3DS{    public:	/***/	Scene3DS(const char *src);	/***/	Scene3DS(const std::string &src);	/***/	~Scene3DS();	void operator=(const char *src);    private:		void ParseEditor3D(Model3DSChunk c);	void ParseEditObject(Model3DSChunk c);};#endif

#include "scene3ds.h"#include <iostream>using namespace std;#include "chunk/file.h"#include "chunk/chunk.h"Scene3DS::Scene3DS(const char *src){	operator=(src);}Scene3DS::Scene3DS(const string &src){	operator=(src.c_str());}Scene3DS::~Scene3DS(){}void Scene3DS::operator=(const char *src){	Model3DSFile file(src);	Model3DSChunk root = file.Child();	for(Model3DSChunk cc = root.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x0002):				// parse int which has version info			break;						case(0x3d3d):				ParseEditor3D(cc);			break;			default:			break;		}	}}void Scene3DS::ParseEditor3D(Model3DSChunk c){	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x3d3e):				// mesh version			break;			case(0xafff):				Material3DS::Parse(cc);			break;						case(0x4000):				ParseEditObject(cc);			break;						default:			break;		}	}}void Scene3DS::ParseEditObject(Model3DSChunk c){	string obj_name = c.Str();		for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x4100):				Mesh3DS::Parse(obj_name , cc);			break;						case(0x4600):				Light3DS::Parse(obj_name , cc);			break;						case(0x4700):				cout << "\tobject camera\n";			break;						default:				cout << "\terror : unknown object "					<< hex << cc.ID() << dec << "\n";			break;		}	}}

this basically parses the main scene, making relevant calls from its inherited bases.

class Scene3DS : public Light3DS , public Material3DS , public Mesh3DS

Genjix

Author

100

April 16, 2005 12:17 PM

#ifndef MESH3DS_H#define MESH3DS_H#include <map>#include <string>#include "../chunk/chunk.h"#include "mesh3dsobject.h"/***/class Mesh3DS{    public:	/***/	Mesh3DS();	/***/	~Mesh3DS();	void Parse(const std::string &name , Model3DSChunk c);	const std::map<std::string , Mesh3DSObject> &Meshes();    private:	std::map<std::string , Mesh3DSObject> meshes;};#endif

#include "mesh3ds.h"#include <iostream>using namespace std;Mesh3DS::Mesh3DS(){}Mesh3DS::~Mesh3DS(){}void Mesh3DS::Parse(const string &name , Model3DSChunk c){	cout << "Mesh3DS::Parse(" << name << ",c)\n";	Mesh3DSObject mesh(c);	meshes[name] = mesh;}const std::map<std::string , Mesh3DSObject> &Mesh3DS::Meshes(){	return meshes;}

and the Mesh3DSObject itself

#ifndef MESH3DSOBJECT_H#define MESH3DSOBJECT_H#include <map>#include <string>#include <vector>#include "../chunk/chunk.h"struct Mesh3DSVertex{	float x , y , z;};struct Mesh3DSTextureCoord{	float u , v;};struct Mesh3DSFace{	int a , b , c;};struct Mesh3DSMatrix{	float m[4][4];};/***/class Mesh3DSObject{    public:	/***/	Mesh3DSObject();	/***/	Mesh3DSObject(Model3DSChunk c);	/***/	Mesh3DSObject(const Mesh3DSObject &mesh);	/***/	~Mesh3DSObject();		void operator=(const Mesh3DSObject &mesh);	Mesh3DSMatrix Matrix();	// adds last row (0,0,0,1)	const std::vector<Mesh3DSVertex> &Vertices();	const std::vector<Mesh3DSTextureCoord> &TextureCoords();	const std::vector<Mesh3DSFace> &Faces();	const std::map<std::string , std::vector<int> > &Materials();    private:		void ParseLocalCoordinateSystem(Model3DSChunk c);	void ParseVertices(Model3DSChunk c);	void ParseTextureCoords(Model3DSChunk c);	void ParseFaces(Model3DSChunk c);	void ParseFacesMaterials(Model3DSChunk c);	Mesh3DSMatrix matrix;	std::vector<Mesh3DSVertex> vertices;	std::vector<Mesh3DSTextureCoord> texturecoords;	std::vector<Mesh3DSFace> faces;	std::map<std::string , std::vector<int> > material_faces;};#endif

#include "mesh3dsobject.h"#include <iostream>using namespace std;Mesh3DSObject::Mesh3DSObject(){}Mesh3DSObject::Mesh3DSObject(Model3DSChunk c){	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x4160):				ParseLocalCoordinateSystem(cc);			break;			case(0x4110):				ParseVertices(cc);			break;			case(0x4140):				ParseTextureCoords(cc);			break;			case(0x4120):				ParseFaces(cc);			break;			default:				cout << "\t\terror : unknown chunk " << cc.ID() << "\n";			break;		}	}}Mesh3DSObject::Mesh3DSObject(const Mesh3DSObject &mesh){	operator=(mesh);}Mesh3DSObject::~Mesh3DSObject(){}void Mesh3DSObject::operator=(const Mesh3DSObject &mesh){	matrix = mesh.matrix;	vertices = mesh.vertices;	texturecoords = mesh.texturecoords;	faces = mesh.faces;	material_faces = mesh.material_faces;}void Mesh3DSObject::ParseLocalCoordinateSystem(Model3DSChunk c){	// bottom row should be (0 , 0 , 0 , 1)	// populate matrix	for(int i = 0 ; i < 4 ; i++)	{		for(int j = 0 ; j < 3 ; j++)		{			matrix.m[j] = c.Float();		}	}	// output matrix to the screen	for(int j = 0 ; j < 3 ; j++)	{		cout << "\t\t\t(";		for(int i = 0 ; i < 4 ; i++)		{			cout << matrix.m[j];						if(i < 3)				cout << " , ";		}		cout << ")\n";	}	matrix.m[0][3] = 0;	matrix.m[1][3] = 0;	matrix.m[2][3] = 0;	matrix.m[3][3] = 1;	cout << "\t\t\t(0 , 0 , 0 , 1)\n";}void Mesh3DSObject::ParseVertices(Model3DSChunk c){	int n_vertices = c.Short();	Mesh3DSVertex v;	cout << dec << "\t\t\tn_vertices = (" << n_vertices << ")\n";	for(int i = 0 ; i < n_vertices ; i++)	{		v.x = c.Float();		v.y = c.Float();		v.z = c.Float();				vertices.push_back(v);		cout << "\t\t\tv[" << i << "] = ("			<< v.x << "," << v.y << "," << v.z << ")\n";	}}void Mesh3DSObject::ParseTextureCoords(Model3DSChunk c){	int n_texcoords = c.Short();		Mesh3DSTextureCoord texcoord;	cout << dec << "\t\t\tn_texcoords = (" << n_texcoords << ")\n";	for(int i = 0 ; i < n_texcoords ; i++)	{		texcoord.u = c.Float();		texcoord.v = c.Float();				texturecoords.push_back(texcoord);				cout << "\t\t\ttexcoord[" << i << "] = ("			<< texcoord.u << "," << texcoord.v << ")\n";	}}void Mesh3DSObject::ParseFaces(Model3DSChunk c){	int n_faces = c.Short();	Mesh3DSFace face;	cout << dec << "\t\t\tn_faces = (" << n_faces << ")\n";	for(int i = 0 ; i < n_faces ; i++)	{		face.a = c.Short();		face.b = c.Short();		face.c = c.Short();		c.Short();	// read the crappy flag		faces.push_back(face);		cout << "\t\t\tface[" << i << "] = ("			<< face.a << "," << face.b << "," << face.c << ")\n";	}	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x4130):				ParseFacesMaterials(cc);			break;			default:			break;		}	}}void Mesh3DSObject::ParseFacesMaterials(Model3DSChunk c){	string material_name = c.Str();	vector<int> faces_applied;	cout << "\t\t\t\tmaterial name = (" << material_name << ")\n";	int n_faces = c.Short();	for(int i = 0 ; i < n_faces ; i++)	{		int f = c.Short();				faces_applied.push_back(f);				cout << "\t\t\t\tmaterial assigned to face " << f << "\n";	}	material_faces[material_name] = faces_applied;}Mesh3DSMatrix Mesh3DSObject::Matrix(){	return matrix;}const std::vector<Mesh3DSVertex> &Mesh3DSObject::Vertices(){	return vertices;}const std::vector<Mesh3DSTextureCoord> &Mesh3DSObject::TextureCoords(){	return texturecoords;}const std::vector<Mesh3DSFace> &Mesh3DSObject::Faces(){	return faces;}const std::map<std::string , std::vector<int> > &Mesh3DSObject::Materials(){	return material_faces;}

note here that most of the object loading is done by the object itself

[Edited by - Genjix on April 16, 2005 1:17:20 PM]

Genjix

Author

100

April 16, 2005 12:19 PM

#ifndef MATERIAL3DS_H#define MATERIAL3DS_H#include <map>#include <string>#include "../chunk/chunk.h"#include "material3dsobject.h"/***/class Material3DS{    public:	/***/	Material3DS();	/***/	~Material3DS();	void Parse(Model3DSChunk c);	const std::map<std::string , Material3DSObject> &Materials();    private:		std::string MaterialMap(Model3DSChunk c);		std::map<std::string , Material3DSObject> materials;};#endif

#include "material3ds.h"#include <iostream>#include <string>using namespace std;Material3DS::Material3DS(){}Material3DS::~Material3DS(){}void Material3DS::Parse(Model3DSChunk c){	string mat_name , texture_name;	float shininess_percent , transparency_percent;	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0xa000):				mat_name = cc.Str();			break;						case(0xa040):				shininess_percent = 1.0;			break;						case(0xa050):				transparency_percent = 1.0;			break;						case(0xa200):			case(0xa33a):				texture_name = MaterialMap(cc);			break;						default:			break;		}	}		cout << "texture(" << mat_name << "," << texture_name << ")\t"		<< "shininess = (" << shininess_percent << ")\t"		<< "transparency = (" << transparency_percent << ")\n";	Material3DSObject material(texture_name ,					shininess_percent , transparency_percent);	materials[mat_name] = material;}std::string Material3DS::MaterialMap(Model3DSChunk c){	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0xa300):				return cc.Str();			break;						default:			break;		}	}}const std::map<std::string , Material3DSObject> &Material3DS::Materials(){	return materials;}

and the Material3DSObject

#ifndef MATERIAL3DSOBJECT_H#define MATERIAL3DSOBJECT_H#include <string>#include "../chunk/chunk.h"/***/class Material3DSObject{    public:	/***/	Material3DSObject();	/***/	Material3DSObject(const std::string &texturename ,				float shininess , float transparency);	/***/	Material3DSObject(const Material3DSObject &material);	/***/	~Material3DSObject();	void operator=(const Material3DSObject &material);	const std::string &Texture();	const float Shininess();	const float Transparency();    private:	std::string texture;	float shininess_percent , transparency_percent;};#endif

#include "material3dsobject.h"using namespace std;Material3DSObject::Material3DSObject(){	shininess_percent = 0.0;	transparency_percent = 0.0;}Material3DSObject::Material3DSObject(const std::string &texturename ,					float shininess , float transparency): texture(texturename) ,  shininess_percent(shininess) , transparency_percent(transparency){}Material3DSObject::Material3DSObject(const Material3DSObject &material){	operator=(material);}Material3DSObject::~Material3DSObject(){}void Material3DSObject::operator=(const Material3DSObject &material){	texture = material.texture;	shininess_percent = material.shininess_percent;	transparency_percent = material.transparency_percent;}const std::string &Material3DSObject::Texture(){	return texture;}const float Material3DSObject::Shininess(){	return shininess_percent;}const float Material3DSObject::Transparency(){	return transparency_percent;}

remember above that most of the loading was done in the mesh object itself? well here we do the opposite. this is because, because we're adding the material to a hash array, we need to know its name. meaning we have to start parsing the 3ds file for the materials name. We also need to therefore extract the needed info from the other chunks.
This is a limitation of the way 3ds files uses chunks - a workaround can be made, but it's long and arduous (not worth it).

[Edited by - Genjix on April 16, 2005 1:19:08 PM]

Genjix

Author

100

April 16, 2005 02:06 PM

this is probably the simplest of all.

#ifndef LIGHT3DS_H#define LIGHT3DS_H#include <map>#include <string>#include "../chunk/chunk.h"#include "light3dsobject.h"/***/class Light3DS{    public:	/***/	Light3DS();	/***/	~Light3DS();	void Parse(const std::string &name , Model3DSChunk c);		const std::map<std::string , Light3DSObject> &Lights();	    private:	std::map<std::string , Light3DSObject> lights;};#endif

#include "light3ds.h"using namespace std;Light3DS::Light3DS(){}Light3DS::~Light3DS(){}void Light3DS::Parse(const string &name , Model3DSChunk c){	Light3DSObject light(c);	lights[name] = light;}const std::map<std::string , Light3DSObject> &Light3DS::Lights(){	return lights;}

and the Light3DSObject

#ifndef LIGHT3DSOBJECT_H#define LIGHT3DSOBJECT_H#include "../chunk/chunk.h"struct Light3DSVertex{	float x , y , z;};/***/class Light3DSObject{    public:	/***/	Light3DSObject();	/***/	Light3DSObject(Model3DSChunk c);	/***/	Light3DSObject(const Light3DSObject &light);	/***/	~Light3DSObject();	/***/	void operator=(const Light3DSObject &light);		bool SpotLight();	///< is this a spot light?	const Light3DSVertex &Position();	const Light3DSVertex &Target();    private:	Light3DSVertex position;		bool spot_light;	Light3DSVertex target;};#endif

#include "light3dsobject.h"Light3DSObject::Light3DSObject(): spot_light(0){}Light3DSObject::Light3DSObject(Model3DSChunk c): spot_light(0){	position.x = c.Float();	position.y = c.Float();	position.z = c.Float();	for(Model3DSChunk cc = c.Child() ; cc ; cc = cc.Sibling())	{		switch(cc.ID())		{			case(0x4610):				spot_light = 1;								target.x = cc.Float();				target.y = cc.Float();				target.z = cc.Float();			break;						default:			break;		}	}}Light3DSObject::Light3DSObject(const Light3DSObject &light): spot_light(0){	operator=(light);}Light3DSObject::~Light3DSObject(){}void Light3DSObject::operator=(const Light3DSObject &light){}bool Light3DSObject::SpotLight(){	return spot_light;}const Light3DSVertex &Light3DSObject::Position(){	return position;}const Light3DSVertex &Light3DSObject::Target(){	return target;}

notice how the light object defaults to an omni, and only becomes a spotlight when the 0x4610 chunk is encountered.

Genjix

Author

100

April 16, 2005 02:12 PM

thats it!

the whole mess can be found here

things to do

namespace some items

fog support

expand on some of lighting features

I may show you some of these features when I get time and if enough people request them ;)

[Edited by - Genjix on December 1, 2005 9:12:05 AM]

Genjix

Author

100

April 16, 2005 02:14 PM

pm me questions and I will answer them here!

FAQ

Genjix

Author

100

April 16, 2005 03:35 PM

btw: about making a nice html version of this tutorial. I emailed GDNet articles section asking if they wanted to let me host this tutorial there.

3DS parsing tutorial

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