don't even worry about it

gistfile1.txt

		// Generate vertices
		const int size = 256;

		verts.reserve(size*size);
		faces.reserve(size*size);

		for (int j = 0; j < size; j++)
		{
			for (int i = 0; i < size; i++)
			{
				Vertex v;
				v.position = glm::vec3(i, j, 0);
				v.position.z += glm::perlin(v.position / 50.f) * 10.0f;
				v.position.z += glm::perlin(v.position / 20.f) * 5.0f;
				v.position.z += glm::perlin(v.position / 5.0f) / 2.0f;
				v.position.z += glm::perlin(v.position / 2.0f) / 4.0f;

				v.texcoord = glm::vec2(i / 10.0f, j / 10.0f);

				verts.push_back(v);
			}
		}

		// Build index buffer and calculate vertex normals.
		for (int j = 0; j < size-1; j++)
		{
			for (int i = 0; i < size-1; i++)
			{
				unsigned row = j*size;
				unsigned next = row+size;
				faces.push_back(Face(row+i, row+i+1, next+i));
				faces.push_back(Face(next+i, row+i+1, next+i+1));

				Face f1 = faces[faces.size()-2], f2 = faces[faces.size()-1];
				Vertex *v[4];
				v[0] = &verts[f1.verts[0]];
				v[1] = &verts[f1.verts[1]];
				v[2] = &verts[f1.verts[2]];
				v[3] = &verts[f2.verts[2]];

				v[0]->normal = mknormal(
					v[0]->position,
					v[1]->position,
					v[2]->position
				);
				v[1]->normal = v[2]->normal = v[3]->normal = v[0]->normal;
			}
		}