RGBA flag fails when using osmesa backend

[Hellomodo]

Following #4, I set the bg_color and RenderFlags as follow, but the output color has a shape of h x w x 3 (h x w x 4 is expected).
scene = pyrender.Scene(bg_color=[1.0, 1.0, 1.0, 0.0]) \ flags = pyrender.RenderFlags.RGBA \ r = pyrender.OffscreenRenderer(h, w) \ color, depth = r.render(scene, flags=flags)

Additionally, I set os.environ["PYOPENGL_PLATFORM"] = "osmesa", which is the only difference between my testing script with other demo (https://github.com/JonathanLehner/Colab-collection/blob/master/pyrender_hand.ipynb).

[VVingerfly]

Hi, @Hellomodo

I met the same problem, have solved this problem?

B.R.

[Hellomodo]

Not yet, I have to use EGL backend。

[slowpokefarm]

Same issue here. Any solution yet?

[indigo-99]

Same issue !! Any solution yet?

[alon-ne]

Hi, I also have this issue

[zzharsky]

having the same issue. any ideas about workarounds? using a server without GPU, so EGL is not an option

[zzharsky]

@mmatl can you please comment? any chance this will be solved?

[Darius-H]

bug not fixed yet

[masonwang513]

This works:

rgb, depth = render.render(scene)
alpha = depth > 0

[ZoidbergPi]

color_im, depth_im = r.render(scene, flags=pyrender.RenderFlags.RGBA)
threshold = 1.0
alpha_channel = np.where(depth_im < threshold, 0, 255).astype(np.uint8)
color_with_alpha = np.dstack((color_im[:, :, :3], alpha_channel))
image = Image.fromarray(color_with_alpha)