Thanks for your great work. Does the s in equation (9) refer to 0.2 in the code?

[qhdqhd]

Does the s in equation (9) refer to 0.2 in the code?

[niujinshuchong]

Hi, Yes.

[qhdqhd]

Thanks for your fast response. I just can not understand why is opacity * coef? I thought it should be scale * coef to make the scale of the 3d gaussian ball larger.

Here is your raw code:

def get_opacity_with_3D_filter(self):
        opacity = self.opacity_activation(self._opacity)
        # apply 3D filter
        scales = self.get_scaling

        scales_square = torch.square(scales)
        det1 = scales_square.prod(dim=1)

        scales_after_square = scales_square + torch.square(self.filter_3D) 
        det2 = scales_after_square.prod(dim=1) 
        coef = torch.sqrt(det1 / det2)
        return opacity * coef[..., None]

[niujinshuchong]

Hi, scale is modified in get_scale_with_3D_filter. Here the coef is the sqrt part in your screenshot.

[qhdqhd]

Thanks. I get it.