[x3d-public] 21 JAN 2020: X3Dv4 PBR review

[Michalis Kamburelis]

> We will soon create a set of conversion examples in X3D using his tool as baseline, checking these into the X3D Example Archives.
>
>         glTF-Sample-Models
>         https://github.com/KhronosGroup/glTF-Sample-Models

Note that most sample models there do not contain any light sources.
(Instead they rely on glTF viewer setting up some default lighting.)

Examples with lights:

- For punctual lights (point, spot, directional, defined in
https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual
):

    It's easy to create your own example, since Blender can export
such lights. I made example in CGE demo-models,
https://github.com/castle-engine/demo-models/tree/master/gltf/punctual_lights
. The test_lights.gltf inside is a glTF JSON and contains lights.

- For image-based lighting (defined in
https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_lights_image_based
):

    Example is in
https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/EnvironmentTest
.

Regards,
Michalis