Cross
Implement a shading effect on the cube object based on the cosine of the angle between the normal vector N of each object fragment and the direction vector L from the fragment to the light source, which is located at coordinates (0.0, 1.0, 3.0).
To calculate the fragment normal N, use the dFdx and dFdy functions that you learned in the previous task, along with the new cross function.
Note: The fragment position is stored in the vPos variable.
varying vec3 vPos;
const vec3 lightPos = vec3(0.0, 1.0, 3.0);
void main() {
gl_FragColor = vec4(vec3(0.0, 0.55, 0.55), 1.0);
}
