Complexpbr did not render correctly

General Discussion
1

complexpbr renders it as gray black. but simplepbr renders correctly as green grass.

from direct.showbase.ShowBase import ShowBase
from panda3d.core import DirectionalLight, Vec4, Vec3, TextureStage, NodePath, AnimBundleNode
from panda3d.core import *
import simplepbr
import complexpbr
from direct.actor.Actor import Actor

import panda3d

class MyApp(ShowBase):
    def __init__(self):
        # Initialize the base class (ShowBase)
        ShowBase.__init__(self)

        #simplepbr.init(enable_shadows=True, use_normal_maps=True)
        complexpbr.apply_shader(self.render)
        
        

        model_path = self.loader.loadModel('grass_ground_1.glb')
        
        model_path.reparent_to(self.render)
        
        self.ambientLight = AmbientLight("ambientLight")
        self.ambientLight_Intensity=0.8
        self.ambientLight.setColor((self.ambientLight_Intensity,self.ambientLight_Intensity,self.ambientLight_Intensity, 1))
        self.render.setLight(self.render.attachNewNode(self.ambientLight))
        self.directionalLight = DirectionalLight("directionalLight_1")
        self.directionalLight_intensity=5
        self.directionalLight.setColor((self.directionalLight_intensity,self.directionalLight_intensity,self.directionalLight_intensity, 1))
        #self.directionalLight.setSpecularColor((.1, .1, .1, .1))
        self.directionalLight.setShadowCaster(True, 512, 512)
        self.dlight1=self.render.attachNewNode(self.directionalLight)
        self.render.setLight(self.dlight1)
        
# Run the application
app = MyApp()
app.run()

model link

2

I’m not sure what you would like to do. The Arena FPS Sample Program is the baseline program which contains all the actual model files and textures one needs to render a complexpbr environment correctly.

Please reference that program for proper complexpbr usage.

3

I set position and angle to the directional light. Now it’s working.
But without directional light and using only ambient light, it renders black.

4

Thats correct. When using complexpbr, never use AmbienghtLight. It uses IBL.

5

In general, you can and probably should use both an AmbientLight and something else like a Spotlight if you want to get an IBL scene lit properly (and with customization).

If you’d just like a quick lighting setup, you can also call complexpbr.apply_shader(self.render, default_lighting=True) for automatic lighting.

For other specific scene lighting setup, one can reference the Arena FPS sample program lighting file here: Panda3D-Arena-FPS-Sample-Program/arena_lighting.py at main · rayanalysis/Panda3D-Arena-FPS-Sample-Program · GitHub