Procedurally generated geometry tutorial - Revision history

Newacct at 04:09, 18 March 2011

2011-03-18T04:09:10Z

2011-03-17T10:52:52Z

Undo revision 690 by Newacct (Talk)

2011-03-17T10:51:42Z

2011-03-01T08:07:08Z

2010-01-03T16:51:41Z

2009-11-28T13:34:22Z

2009-10-26T12:00:02Z

2009-10-26T11:46:43Z

2009-10-26T11:37:12Z

2009-10-26T11:31:21Z

@@ Line 781: / Line 781: @@
 		if (std::getline(inFile, line)) {
 			std::cout<<"Line: "<<line<<std::endl;
-			//if (!(line == "D2SG")) {
+			if (line != "D2SG") {
 				std::cout<<"wrong grid-file format "<<line.compare("D2SG")<<std::endl;
 				error = true;

@@ Line 781: / Line 781: @@
 		if (std::getline(inFile, line)) {
 			std::cout<<"Line: "<<line<<std::endl;
-			if (line != "D2SG") {
+			//if (!(line == "D2SG")) {
 				std::cout<<"wrong grid-file format "<<line.compare("D2SG")<<std::endl;
 				error = true;

@@ Line 781: / Line 781: @@
 		if (std::getline(inFile, line)) {
 			std::cout<<"Line: "<<line<<std::endl;
-			//if (!(line == "D2SG")) {
+			if (line != "D2SG") {
 				std::cout<<"wrong grid-file format "<<line.compare("D2SG")<<std::endl;
 				error = true;

@@ Line 15: / Line 15: @@
 When we have calculated the geometry itself we need to create a char-stream to make Horde believe the geometry has been read from a file and pass it to Horde as a geometry Resource.
 The final step is to create a Horde3D Scene Node from our procedurally generated mesh and render it into our scene.
 =StreamGenerator=
@@ Line 481: / Line 479: @@
 All the work above was made to create my own interactive terrain generator(screenshot on top of this page) for a A* pathfinding demonstrator. The Grid-class actually generates a 2-dimensional array of Vec3f(s) and allows to extrude each point and re-generate the mesh in realtime. The internal representation is writeable and in case of a change of any point the overridden update() function will be called to update the Horde3D geometry resource.
 {{CppSourceCode|
 description= DynamicGrid.h|

← Older revision		Revision as of 16:51, 3 January 2010
Line 1:		Line 1:
		+	__NOTOC__ __NOEDITSECTION__{{ContentBlock\|color=white\|content={{!!}}
	'''Work in progress - Due to the current changes in the Horde API this tutorial will be delayed '''		'''Work in progress - Due to the current changes in the Horde API this tutorial will be delayed '''

Line 868:		Line 869:

	'''TODO'''		'''TODO'''
		+	}}

@@ Line 362: / Line 362: @@
 =Simple Square=
-A simple two-sided (hard-coded) square. This is pretty straight forward and demonstrates how to derive from the CustomGeometry class and how the triangle indices work.
+A simple hard-coded square. This is pretty straight forward and demonstrates how to derive from the CustomGeometry class and how the triangle indices work.
 {{CppSourceCode|
@@ Line 404: / Line 404: @@
 	_size = size_;
 	_name = name_;
-	_numVertices = 8;
+	_numVertices = 4;
-	_numTriangles = 4;
+	_numTriangles = 2;
-	_numTriangleIndices = (_numVertices - 2) * 3;
+	_numTriangleIndices = _numTriangles * 3;
 	//generate();
+}
@@ Line 438: / Line 438: @@
 	_positions[11] = _origin.z * _size + _size/2;
+}
 void DynamicSquare::generateNormals()
+{
-	_normals = new float[_numVertices * 3*2];
+	_normals = new float[_numVertices * 3];
 	for (int i=0; i< 12; i+=3) {
 		_normals[i] = 0;
 		_normals[i+1] = 1;
 		_normals[i+2] = 0;
+	}
@@ Line 475: / Line 452: @@
 void DynamicSquare::generateTexCoords()
+{
-	_texCoords = new float[_numVertices * 2 * 2];
+	_texCoords = new float[_numVertices * 2];
 	_texCoords[0] = 0.0f;
 	_texCoords[1] = 0.0f;
@@ Line 484: / Line 461: @@
 	_texCoords[6] = 1.0f;
 	_texCoords[7] = 1.0f;
+}
@@ Line 503: / Line 472: @@
 	_tIndices[4] = 2;
 	_tIndices[5] = 3;
+}
 </source>

@@ Line 547: / Line 547: @@
 	DynamicGrid(const float size_, const std::string name_, std::string fileName_);
 	Vec3f getPointAt(int x_, int y_) { return _grid[y_][x_]; }
 	void setPointAt(int x_, int y_, Vec3f newPos_) { _grid[y_][x_] = newPos_; }
 	int getGridSize() { return _gridSize; }
 	// overwrite update() from parent class
 	void update();
 	void saveGridToFile(std::string fileName_);
 	bool readGridFromFile(std::string fileName_);
@@ Line 609: / Line 611: @@
 // the following two functions could be combined into one single loop, but I left it this way for clarity...
 void DynamicGrid::generateGrid()
+{
@@ Line 623: / Line 628: @@
+}
 void DynamicGrid::generatePositions()
+{
@@ Line 879: / Line 887: @@
 =Usage example=

@@ Line 14: / Line 14: @@
 When we have calculated the geometry itself we need to create a char-stream to make Horde believe the geometry has been read from a file and pass it to Horde as a geometry Resource.
 The final step is to create a Horde3D Scene Node from our procedurally generated mesh and render it into our scene.
-[http://musicracer.de/images/musicracer_intro.jpg
+[http://musicracer.de/images/Screenshot-1_small.jpg
 This is how it could look like]
@@ Line 514: / Line 514: @@
 =Simple Grid=
 =Usage example=