[x3d-public] Some screenshots with PhysicalMaterial and glTF

[Michalis Kamburelis]

P.S. Just to clarify my "experiment, compare how the FlightHelmet
looks like" in the previous mail:

This was not a fair comparison.

To show the FlightHelmet in Phong version, I just removed the
"PhysicalMaterial.metallicRoughnessTexture", and then used
"PhysicalMaterial.baseTexture" as a "Material.diffuseTexture". IOW,
for diffuse I used a texture that was never supposed to be diffuse. A
proper "conversion" from PhysicalMaterial -> (Phong) Material should
be done by a graphic artist, who would adjust the colors of the
"Material.diffuseTexture" image, and use other Material textures (like
Material.specularTexture, which I also added in my PR).

So don't treat it as a "proof" that PhysicalMaterial (PBR)
automagically looks better than Material (Phong) lighting model :)
It's not so simple to compare.

The "fair" comparison is hard, because these models just expose
different parameters, and a fair comparison should involve a graphic
artist who spends equal time to "tweak" these parameters in both
cases, to achieve the best possible look.

Regards,
Michalis

sob., 7 mar 2020 o 01:56 Michalis Kamburelis
<michalis.kambi at gmail.com> napisał(a):
>
> As a teaser before next Friday, let me share some images I
> generated yesterday and today :)
>
> The new lighting model really looks pretty when used correctly (when
> you supply various textures to vary details across the surface).
> https://github.com/KhronosGroup/glTF-Sample-Models/ contains a number
> of examples. Rendering of latest Castle Game Engine and view3dscene
> can be compared with glTF-Sample-Viewer.
>
> Here are 2 screenshots from view3dscene showing various glTF models:
>
> - https://castle-engine.io/wp/wp-content/uploads/2020/03/FlightHelmet_0.png
>
> - https://castle-engine.io/wp/wp-content/uploads/2020/03/DamagedHelmet_0.png
>
> As an experiment, compare how the FlightHelmet looks like:
>
> - With PhysicalMaterial in X3D v4:
> https://castle-engine.io/wp/wp-content/uploads/2020/03/FlightHelmet_physical.png
>
> - With (Phong) Material in X3D v4 (so with diffuse and normal
> texture): https://castle-engine.io/wp/wp-content/uploads/2020/03/FlightHelmet_phong_v4.png
>
> - With (Phong) Material in X3D v3 (only diffuse):
> https://castle-engine.io/wp/wp-content/uploads/2020/03/FlightHelmet_phong_v3.png
>
> Here's a demo that metallic/roughness works in CGE consistently with
> glTF-Sample-Viewer (just the light source in glTF-Sample-Viewer is
> different than view3dscene headlight):
>
> - https://castle-engine.io/wp/wp-content/uploads/2020/03/metallic_roughness_view3dscene.png
>
> - https://castle-engine.io/wp/wp-content/uploads/2020/03/metallic_roughness_gltf_sample_viewer.png
>
> P.S. I'm working now on EnvironmentLight node, to perform image-based
> lighting -- both for Phong and physical lighting model.
>
> Regards,
> Michalis