gltf_image vector4 helper node missing

[pablode]

Currently, the following glTF image helper nodes exist:

category	output type(s)
<gltf_colorimage>	color3 + float
<gltf_image>	color3
<gltf_image>	color4
<gltf_image>	float
<gltf_image>	vector3

It would be nice to have a vector4 <gltf_image> node as well. The reason is that glTF extensions only define the channels from which the data comes from, meaning that images can be mixed and matched.

For example, there could be a 4-channel ORM image with the specularFactor in the alpha channel.

The new node would be most suitable here.

[kwokcb]

Hi @pablode,

All the gltf utility definitions / variants are wrappers to support direct connections (with 3 channel extract for ORM added in 1.39.3) to inputs on glTF PBR. -- thus there is no vec4 variant.

We could add in the vec4 variant but need to know where it's formalized in the glTF spec that you can put spcularFactor into a 4 channel image and extract it out ? The link says it's a number only.

[pablode]

Hi @kwokcb, thanks for looking into this and sorry for being imprecise.

I actually meant the "specularTexture" slot below it.