square mesh generator

meshGenerator.cpp

void generateMesh () {

	int cMeshWidth  = 200; // mesh dimensions
	int cMeshHeight = 200;

	// setup mesh

	vector<ofVec3f> vertices;
	vector<ofIndexType> indices;
	vector<ofVec2f> texCoords;

	{
		int delta = 2; // mesh density
		
		
		float oneOverWidth  = 1.0 / float(cMeshWidth);
		float oneOverHeight = 1.0 / float(cMeshHeight);
		
		int z = 0;
		int x = 0;
		
		// note that we say <= so that we make sure to capture the full width
		
		for (z=0; z * delta <= cMeshHeight; z++){
			for (x=0; x * delta <= cMeshWidth; x++){
				vertices.push_back(ofVec3f(x * delta, 0, z * delta));
				texCoords.push_back(ofVec2f(x * delta, z * delta) * ofVec2f(oneOverWidth, oneOverHeight));
				ofLogNotice() << vertices.back();
			}
		}
		
		// invariant: x and z are at their respective maximum values
		// so keep these values for the indexing
		
		int maxZ = z;
		int maxX = x;
		
		// now index the mesh
		
		for (z = 0; z+1 < maxZ; z++) {
			for (x = 0; x+1 < maxX; x++) {
				indices.push_back(x + 0 + (z + 0) * maxX);
				indices.push_back(x + 0 + (z + 1) * maxX);
				indices.push_back(x + 1 + (z + 1) * maxX);
				
				indices.push_back(x + 0 + (z + 0) * maxX);
				indices.push_back(x + 1 + (z + 1) * maxX);
				indices.push_back(x + 1 + (z + 0) * maxX);
			}
		}
		
		{
			int counter = 0;
			ostringstream s;
			s << endl;
			for (auto const &i : indices){
				s << setw(2) << i << ", " ;
				if (++counter % 3 == 0) s << endl;
			}
			ofLogNotice() << s.str();
		}
		// now build the mesh
		
		mMsh.addVertices(vertices);
		mMsh.addTexCoords(texCoords);
		mMsh.addIndices(indices);
		mMsh.setUsage(GL_STATIC_DRAW);

	}
}