Details of NerfHead parameters

[yutao98]

Hi, when i change nerfhead config to a smaller version, i cant get expected rendering results. Config has been modified according to #20. Could you give some suggestion or more explaination of paremeters in NerfHead? Here is my config.

model = dict(
    type='RenderOcc',
    final_softplus=True,
    nerf_head=dict(
        type='NerfHead',
        point_cloud_range=[-51.2, -51.2, -1.0, 51.2, 51.2, 5.0],
        voxel_size=1.6,
        step_size=1.6,
        scene_center=[0, 0, 2.0],
        world_size=[64,64,4],
        radius=50,
        use_depth_sup=True,

By the way, https://github.com/pmj110119/RenderOcc/blob/446b7fd315cb98ff084d90058ff90cbe59bfe91e/mmdet3d/models/nerf/nerf_head.py#L218 I modified this line to: alpha = self.activate_density(density, interval=self.step_size) Is that right?