solved What is the structure for PBR materials in a babylon.js file

[JonVarner]

Hey all, I hope this question is not to random. But I am looking at updating the exporter from blender to include PBR as an option. What I don't have is an example of what a PBR meterial definition should look like for an imported file. Right now materials are exported from blender like:

"materials":[{"name":"material1","id":"material1","ambient":[0.5,0.5,0.5],"diffuse":[0.4,0.4,0.4],"specular":[0.5,0.5,0.5],"emissive":[0,0,0],"specularPower":49,"alpha":1,"backFaceCulling":true,"checkReadyOnlyOnce":false,"maxSimultaneousLights":4}],

This of course loads as standard materials. I was wondering if someone had an example of what this should look like to load as a PBR material? I can update the exporter on my end, I would just like to make sure its possible and how it should look.

[babbleon]

Hi @JonVarner,

This thread may help you....

but the important bit is that under each of the materials, for it to be treated as PBR the exporter needs to add: customType":"BABYLON.PBRMaterial"

 

[JonVarner]

Ah..perfect thanks. I did a search and somehow this one did not come up. Will check it out.

[babbleon]

PS. attached is my modified 5.6.2 material.py which exports all material as PBR, but nothing more than that, it does not include texture, colour etc.

material.py

[JonVarner]

Wow awesome. Thanks!  This will give me a running start.

[babbleon]

You're welcome. Hope you get on okay.

[JonVarner]

I will re-post here once I add the textures and color.

[Sebavan]

SWEEEEEEET !!!

[babbleon]

@JonVarner - just a thought.. but I wonder if when you use the Principled BSDF shader, the exporter would pick up on this and save as PBR. Would require the baking of textures to be disabled when using Cycles though.

[JonVarner]

Right. I am still trying to wrap my head around how what approach I will end up taking. In our pipeline we simply pass and fbx through blender with standard materials so I have feeling for our needs we will just be passing things through with basic materials. The idea would be that we would pull the texture data from the diffuse, bump, and ambient slots. So we will probably not go so far as cycles and baking.

[Sebavan]

@JonVarner might be worth looking at the gltf blender exporter as they have to deal with the same kind of features for PBR.

[JonVarner]

Thanks, was looking at that as well.

[JonVarner]

So I was originally this was going to be more of a blender exercise but that's proving to be the easy part :) I added:

"albedoTexture":{"name":"texture.png","level":0,"hasAlpha":1,"coordinatesMode":0,"uOffset":0,"vOffset":0,"uScale":1,"vScale":1,"uAng":0,"vAng":0,"wAng":0,"wrapU":1,"wrapV":1,"coordinatesIndex":0}

But for for the life of me I cant get it to show up on the material. I am sure I am missing something obvious but can figure out what that is. 

Edited August 15, 2018 by JonVarner
Typo

[babbleon]

You can get the structure of the .babylon PBR setup here: https://www.babylonjs-playground.com/#73069S%232

Maybe change the above PG to match what you are expecting to see then download & compare.

http://jsonviewer.stack.hu/ is a very good tool for picking thru JSON / .babylon files.