How to use hdri along with simplepbr?

SoNewBee · October 12, 2022, 7:42am

Just like the title.I need a sky in my project and I have to add environment lights in my scene.I noticed that a good environment light is vital to pbr-rendering.So,any demo and workflow please?

SoNewBee · October 12, 2022, 1:35pm

And…I just discovered that there is a leveleditor folder in direct folder.I am confused.Does panda3d have an editor?How to use it?

Thaumaturge · October 12, 2022, 1:47pm

Ah, would this not be better suited to the “Scene Editor” thread?

In any case, my understanding is that the editor found there is old and unsupported, and overall deprecated.

So, in a technical sense, there is a level editor bundled with Panda–it’s just not likely to be a useful one, if I’m not much mistaken.

serega-kkz · October 12, 2022, 2:43pm

This has not been implemented yet.

github.com/Moguri/panda3d-simplepbr

Implement image-based lighting

opened 02:11PM - 18 Dec 21 UTC

rdb

Presently, shiny metals will show up pitch black in simplepbr, because of the ab…sence of environmental reflection, as well as the fact that the size of the specular highlight approaches zero when the roughness approaches 1. To properly support metals, and give a more aesthetically pleasing result overall, it is necessary to implement image-based lighting. To keep things simple, the split-sum approximation could be used (as described in the [Unreal paper](https://cdn2.unrealengine.com/Resources/files/2013SiggraphPresentationsNotes-26915738.pdf)), which produces good results except at grazing angles. I think this will require the ability to provide an environment map and implementing the necessary pre-filtering to create the split-sum approximation maps, either with a separate tool or at runtime. Any changes to Panda that may be helpful for this (eg. putting the filter algorithm in PNMImage) should be considered so that they can be implemented by 1.11.

SoNewBee · October 17, 2022, 2:37pm

OK…Does the level editor from CMU still working？

SoNewBee · October 17, 2022, 2:42pm

thanks for your reply.
Is there any way to achieve my goal？
And…when will you support it？

serega-kkz · October 17, 2022, 2:56pm

I have nothing to do with this project. I myself am expecting several functions, a shadow for a point light source, image-based lighting and correcting a couple of errors from the list of reports.

Forward this question to @Moguri, he is the developer of this project.

Thaumaturge · October 17, 2022, 3:02pm

I don’t know offhand, but I seem to vaguely recall that it doesn’t work any more. At the least I wouldn’t recommend relying on it.

There are however a few community-driven projects developing editors, I believe–if you look around the Showcase sub-forum here you might find something of use to you, perhaps.

Moguri · October 17, 2022, 3:15pm

I am not involved in any of the level editor projects, but I can say that, as mentioned, HDRi/IBL is still work-in-progress for simplepbr.

The current work is available on the ibl branch. Only IBL diffuse lighting is implemented; specular still needs to be done. I am pretty low on free time these days, so I do not know when it will be done, but PRs to help move things along are always welcome.

SoNewBee · October 19, 2022, 11:09am

Thanks for your generous work.Please keep up doing.
Another question,How to use simplepbr with heightmap？
I’ve imported simplepbr and tried this

    terrain = GeoMipTerrain("worldTerrain")
    terrain.setHeightfield("heightmap.png")
    terrain.setColorMap("texturemap.png")  
    terrain.setBruteforce(True)            
    root = terrain.getRoot()               
    root.reparentTo(render)               
    root.setSz(60)                        
    terrain.generate()

And I just discovered that the terrain is dark.It seems that "terrain.setColorMap(“texturemap.png”) " didn’t work.

serega-kkz · October 19, 2022, 6:49pm

I think you need to adjust the material according to the pbr requirements, and also use this instruction to adjust your scene.

Potentially there may still be a problem with the name of the UV coordinates.

At the moment, there is a problem with the structuring of the material. Since there is no way to inform panda about the type of material that needs to be used for lighting techniques. If panda had a special call to change the type of shading, then these problems would not exist. Or a special type of class, something like MaterialPBR, I have repeatedly suggested to rdb to approve the idea as a roadmap for the development of panda.

SoNewBee · October 20, 2022, 5:41am

OK…Is there any code demo please？

rdb · October 20, 2022, 8:01am

Note that setColorMap affects the vertex colors. A terrain behaves as any other object. You want to apply a texture instead, as well as a Material object, as any other object.

SoNewBee · October 21, 2022, 3:04pm

wow,Hello,rdb.
Thanks for your reply.
Well…Could you please just show me the code?As a noob,I really don’t know what you mean.
Why it just won’t work since

?
I’ve made a model with textures in blender.Then import to panda3d,it works fine.
Maybe you mean I need to make terrain in blender?

rdb · October 22, 2022, 2:11pm

Create a Material object with the desired base color, roughness, metallic factors, and assign to the terrain. And assign a Texture object as well.

mat = Material("terrain")
mat.base_color = (1, 1, 1, 1)
mat.roughness = 1.0
mat.metallic = 0.0

tex = loader.loadTexture("texturemap.png")
terrain.getRoot().setMaterial(mat)
terrain.getRoot().setTexture(tex)

You can apply roughness/metalic/occlusion maps and emission maps via additional texture stages, if desired.

SoNewBee · October 29, 2022, 10:56am

Oh,It works!!!
Thank you~Thank you~Thank you~