DEFAULT_SPHERICAL_HARMONIC_COEFFICIENTS
The default third order spherical harmonic coefficients used for the diffuse color of image-based lighting, a white ambient light with low intensity.
There are nine Cartesian3
coefficients. The order of the coefficients is: L0,0, L1,-1, L1,0, L1,1, L2,-2, L2,-1, L2,0, L2,1, L2,2