NodeMaterial: Bias example

[sunag]

#17163 (comment)

@WestLangley This is the experiment, note that for irradiance the default value is 1 in bias, for me in irradiance the result is good for both. Without LOD if compared with BASIC is bad in radiance because it needs intermediate values (0-1).

https://rawgit.com/sunag/three.js/dev-nodes-irradiance/examples/webgl_materials_nodes.html?e=bias

[sunag]

In my conclusion, I not see reasons for not use this feature.
#17163 (comment)

[sunag]

only for test and obtain a clean result I put a PREM in PhongNodeMaterial 😅

[sunag]

The blur based on the intermediate curve of bias seems different for both. Only to ensure I will to do more tests related to PBM roughness.

[sunag]

The blur based on the intermediate curve of bias seems different for both. Only to ensure I will to do more tests related to PBM roughness.

This not affect this test.

[mrdoob]

Thanks!