void CGLRenderer::DrawShpere(float radius, int steps, int stacks)
{
	if (SphereCoor.size() > 0) {
		SphereCoor.clear();
	}
	float dAlpha = M_PI * 2 / steps;
	float dTheta = M_PI / stacks;

	float radiusPrim, x, y, z, tempThetaAngle;
	for (float theta = -M_PI / 2; theta <= M_PI/2 + dTheta; theta += dTheta) {
		for (float alpha = 0.0f; alpha <= M_PI * 2; alpha += dAlpha) {

			radiusPrim = cos(theta) * radius;

			x = radiusPrim * sin(alpha);
			z = radiusPrim * cos(alpha);
			y = radius * sin(theta);

			SphereCoor.push_back(x); SphereCoor.push_back(y); SphereCoor.push_back(z);

			// norm
			float nx = cos(theta)*sin(alpha);
			float ny = sin(theta);
			float nz = cos(theta)*cos(alpha);
			SphereCoor.push_back(nx); SphereCoor.push_back(ny); SphereCoor.push_back(nz);

			// text
			float u = 0.5 + atan2(nz, nx) / (2 * M_PI);
			float v = 0.5 - asin(ny) / M_PI;
			SphereCoor.push_back(v); SphereCoor.push_back(u);

			tempThetaAngle = theta - dTheta;
			radiusPrim = cos(tempThetaAngle) * radius;

			x = radiusPrim * sin(alpha);
			z = radiusPrim * cos(alpha);
			y = radius * sin(tempThetaAngle);

			SphereCoor.push_back(x); SphereCoor.push_back(y); SphereCoor.push_back(z);

			// norm
			 nx = cos(tempThetaAngle)*sin(alpha);
			 ny = sin(tempThetaAngle);
			 nz = cos(tempThetaAngle)*cos(alpha);
			 SphereCoor.push_back(nx); SphereCoor.push_back(ny); SphereCoor.push_back(nz);


			//text
			u = 0.5 + atan2(nz, nx) / (2 * M_PI);
			v = 0.5 - asin(ny) / M_PI;
			SphereCoor.push_back(v); SphereCoor.push_back(u);

			// normals nx = cos(theta)*sin(alpha) ny=sin(theta) nz=cos(theta)*cos(alpha)
		}
	}

	glVertexPointer(3, GL_FLOAT, 8 * sizeof(float), SphereCoor.data());
	glNormalPointer(GL_FLOAT, 8 * sizeof(float), &SphereCoor.data()[3]);
	glTexCoordPointer(2, GL_FLOAT, 8 * sizeof(float), &SphereCoor.data()[6]);

	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_NORMAL_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);

	glDrawArrays(GL_QUAD_STRIP, 0, SphereCoor.size() / 8);

	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_NORMAL_ARRAY);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}