Modify Program 13.4 to additionally render the original torus. That is, render both a lighted torus and

Question:

Modify Program 13.4 to additionally render the original torus. That is, render both a lighted torus and the outgoing line segments (using a geometry shader) so that the “hair” looks like it is coming out of the torus.

Program 13.4 $layout (line_strip, max_vertices=2) out; void main(void) {vec3 op0 = gl_in[0].gl_Position.xyz; // original$ vec3 op1 = gl_in[1].gl_Position.xyz; vec3 op2 = gl_in[2].gl_Position.xyz; vec3 ep0 = gl_in[0].gl_Position.xyz