Something changed in the HDR RGBD PACKED Cubemaps from Version Alpha 22 to Alpha 24.
In the toolkit i was packing the HDR lightmap image from unity into a RGBD png. So in my GLTF parser when assigning the material lightmap texture, once the texture is loaded, i set the texture.isRGBD = true like so:
And it works perfect… as has been perfect since i made the new exporter. So a scene that looked like this in Unity
Renders like this in Version 5 from Alpha 1 all the way thru Alpha 22
As picture perfect as its gonna get…
But since the Alpha 24 update they are now really dark and dont have that HDRness
So something in Alpha 24 changed in either the texture.isRGBD = true not working from the the texture on loaded observable or something in the shader for when its RGBD packed images.