Volumetric rendering. Args: ray_o: origins of rays. [N_rays, 3] ray_d: directions of rays. [N_rays, 3] near: the minimal distance. [N_rays, 1] far: the maximal distance. [N_rays, 1] raw_noise_std: If True, add noise on raw output from nn
(self, rays_o, rays_d, near, far, viewdirs=None, stl_idx=None, raw_noise_std=0.,
verbose=False, retraw = False, retpts=False, pytest=False, **kwargs)
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