Pytorch3d: How can I render without any light?

[TheshowN]

How can I render without any light?

I want to generate uv map with pytorch3d. But it seems that renderer must set up lighting (shader), which interferes uv map? So I want to ask about how can I render without any light?

Thank you in advance!

[nikhilaravi]

The simplest solution is to set all the intensity values to (0, 0, 0) when initializing the Lights class. A cleaner approach would be to define your own shader which does not apply lighting e.g.

class HardShader(nn.Module):
    def __init__(
        self, device="cpu", cameras=None, blend_params=None
    ):
        super().__init__()
        self.cameras = cameras
        self.blend_params = blend_params if blend_params is not None else BlendParams()

    def forward(self, fragments, meshes, **kwargs) -> torch.Tensor:
        cameras = kwargs.get("cameras", self.cameras)
        if cameras is None:
            msg = "Cameras must be specified either at initialization \
                or in the forward pass of HardPhongShader"
            raise ValueError(msg)
        texels = interpolate_vertex_colors(fragments, meshes)
        blend_params = kwargs.get("blend_params", self.blend_params)
        images = hard_rgb_blend(texels, fragments, blend_params)
        return images

The Shaders that we provide are only examples and are designed to be easily customized based on your use case!

[nikhilaravi]

@TheshowN do you still need help with this issue?