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| # | |
| # Copyright (C) 2023, Inria | |
| # GRAPHDECO research group, https://team.inria.fr/graphdeco | |
| # All rights reserved. | |
| # | |
| # This software is free for non-commercial, research and evaluation use | |
| # under the terms of the LICENSE.md file. | |
| # | |
| # For inquiries contact george.drettakis@inria.fr | |
| # | |
| import torch | |
| import math | |
| from diff_gaussian_rasterization import ( | |
| GaussianRasterizationSettings, | |
| GaussianRasterizer, | |
| ) | |
| from scene.gaussian_model import GaussianModel | |
| from utils.sh_utils import eval_sh | |
| def render( | |
| viewpoint_camera, | |
| pc: GaussianModel, | |
| pipe, | |
| bg_color: torch.Tensor, | |
| scaling_modifier=1.0, | |
| override_color=None, | |
| ): | |
| """ | |
| Render the scene. | |
| Background tensor (bg_color) must be on GPU! | |
| """ | |
| # Create zero tensor. We will use it to make pytorch return gradients of the 2D (screen-space) means | |
| screenspace_points = ( | |
| torch.zeros_like( | |
| pc.get_xyz, dtype=pc.get_xyz.dtype, requires_grad=True, device="cuda" | |
| ) | |
| + 0 | |
| ) | |
| try: | |
| screenspace_points.retain_grad() | |
| except: | |
| pass | |
| # Set up rasterization configuration | |
| tanfovx = math.tan(viewpoint_camera.FoVx * 0.5) | |
| tanfovy = math.tan(viewpoint_camera.FoVy * 0.5) | |
| raster_settings = GaussianRasterizationSettings( | |
| image_height=int(viewpoint_camera.image_height), | |
| image_width=int(viewpoint_camera.image_width), | |
| tanfovx=tanfovx, | |
| tanfovy=tanfovy, | |
| bg=bg_color, | |
| scale_modifier=scaling_modifier, | |
| viewmatrix=viewpoint_camera.world_view_transform, | |
| projmatrix=viewpoint_camera.full_proj_transform, | |
| sh_degree=pc.active_sh_degree, | |
| campos=viewpoint_camera.camera_center, | |
| prefiltered=False, | |
| debug=pipe.debug, | |
| ) | |
| rasterizer = GaussianRasterizer(raster_settings=raster_settings) | |
| means3D = pc.get_xyz | |
| means2D = screenspace_points | |
| opacity = pc.get_opacity | |
| # If precomputed 3d covariance is provided, use it. If not, then it will be computed from | |
| # scaling / rotation by the rasterizer. | |
| scales = None | |
| rotations = None | |
| cov3D_precomp = None | |
| if pipe.compute_cov3D_python: | |
| cov3D_precomp = pc.get_covariance(scaling_modifier) | |
| else: | |
| scales = pc.get_scaling | |
| rotations = pc.get_rotation | |
| # If precomputed colors are provided, use them. Otherwise, if it is desired to precompute colors | |
| # from SHs in Python, do it. If not, then SH -> RGB conversion will be done by rasterizer. | |
| shs = None | |
| colors_precomp = None | |
| if override_color is None: | |
| if pipe.convert_SHs_python: | |
| shs_view = pc.get_features.transpose(1, 2).view( | |
| -1, 3, (pc.max_sh_degree + 1) ** 2 | |
| ) | |
| dir_pp = pc.get_xyz - viewpoint_camera.camera_center.repeat( | |
| pc.get_features.shape[0], 1 | |
| ) | |
| dir_pp_normalized = dir_pp / dir_pp.norm(dim=1, keepdim=True) | |
| sh2rgb = eval_sh(pc.active_sh_degree, shs_view, dir_pp_normalized) | |
| colors_precomp = torch.clamp_min(sh2rgb + 0.5, 0.0) | |
| else: | |
| shs = pc.get_features | |
| else: | |
| colors_precomp = override_color | |
| # Rasterize visible Gaussians to image, obtain their radii (on screen). | |
| rendered_image, radii, depth, alpha = rasterizer( | |
| means3D=means3D, | |
| means2D=means2D, | |
| shs=shs, | |
| colors_precomp=colors_precomp, | |
| opacities=opacity, | |
| scales=scales, | |
| rotations=rotations, | |
| cov3D_precomp=cov3D_precomp, | |
| ) | |
| # rendered_image, radii = rasterizer( | |
| # means3D = means3D, | |
| # means2D = means2D, | |
| # shs = shs, | |
| # colors_precomp = colors_precomp, | |
| # opacities = opacity, | |
| # scales = scales, | |
| # rotations = rotations, | |
| # cov3D_precomp = cov3D_precomp) | |
| # Those Gaussians that were frustum culled or had a radius of 0 were not visible. | |
| # They will be excluded from value updates used in the splitting criteria. | |
| return { | |
| "render": rendered_image, | |
| "viewspace_points": screenspace_points, | |
| "visibility_filter": radii > 0, | |
| "radii": radii, | |
| "depth": depth, | |
| "alpha": alpha, | |
| } | |