generate opengl handles, renormalize z data

src/heightmap.cpp

@@ -52,9 +52,24 @@ Heightmap::Heightmap(std::string filename): _filename(filename) {
 		_maxY = max(_data, 1, 3);
 		_minZ = min(_data, 2, 3);
 		_maxZ = max(_data, 2, 3);
+		_zRangeUm = (_maxZ - _minZ) / 10.; //in um
+		/*Throw if _zRange is less than 1 A (i.e. it's probably 0)*/
+		if (_zRange < 1e-4) {
+			throw Nt1100_exception("Heightmap: z range is too close to zero (" + std::to_string(_zRange) + ")");
+		}
 		/*TODO: Renormalize model coordinates sensible here*/
+		//For now, I just renormalize the z range to [0,1]
+		double zRangeInverse = 1. / (_maxZ - _minZ);
+		for (auto it = _data.begin()+2; it < _data.end(); it += 3) {
+			*it -= _minZ;
+			*it *= zRangeInverse;
+		}
 
 		/*Initialize Renderer Infrastructure*/
+		glGenBuffers(1, &_vbo);
+		glGenBuffers(1, &_ebo);
+		glGenVertexArrays(1, &_vao);
+		/*TODO: Generate shader, I may want to use a Factory here*/
 
 	}
 	else {