crash when using egl headless render

[vipcxj]

here is code

main.py

import os
os.environ['PYOPENGL_PLATFORM'] = 'egl'
import open3d as o3d
import renderer as renderer

if __name__ == '__main__':    
    try:
        mesh_src = o3d.io.read_triangle_mesh("XXX.obj")
        renderer.render_to_image(mesh_src, "XXX.jpg")
    except Exception as e:
        print(e)

renderer.py

import open3d as o3d
import trimesh
import numpy as np
import matplotlib.pyplot as plt
import pyrender

def render_to_image(mesh, output_path: str, width=640, height=480):
    _mesh = trimesh.Trimesh(
        vertices=np.asarray(mesh.vertices), 
        faces=np.asarray(mesh.triangles), 
        vertex_normals=np.asarray(mesh.vertex_normals),
        # vertex_colors=np.asarray(mesh.vertex_colors),
    )
    
    scene = pyrender.Scene()
    mesh = pyrender.Mesh.from_trimesh(_mesh)
    scene.add(mesh)
    camera = pyrender.PerspectiveCamera(yfov=np.pi / 3.0)
    camera_pose = np.array([
        [1.0, 0.0, 0.0, 0.0],
        [0.0, 1.0, 0.0, -0.5],
        [0.0, 0.0, 1.0, 1.0],
        [0.0, 0.0, 0.0, 1.0]
    ])
    scene.add(camera, pose=camera_pose)
    light = pyrender.PointLight(color=np.ones(3), intensity=10.0)
    scene.add(light, pose=camera_pose)
    
    r = pyrender.OffscreenRenderer(viewport_width=width, viewport_height=height, point_size=1.0)
    
    // crash here, no conole output, no exception, just crash.
    color, depth = r.render(scene)
    
    r.delete()
    
    if output_path is not None and output_path != "":
        plt.imsave(output_path, color)
    
    return color, depth

After debug, I found crash here:

        total_sz = sum(attr_sizes)
        offset = 0
        for i, sz in enumerate(attr_sizes):
            // crash here
            glVertexAttribPointer(
                i, sz, GL_FLOAT, GL_FALSE, FLOAT_SZ * total_sz,
                ctypes.c_void_p(FLOAT_SZ * offset)
            )
            glEnableVertexAttribArray(i)
            offset += sz