mirror of
https://github.com/graphdeco-inria/gaussian-splatting
synced 2024-11-22 16:28:32 +00:00
89 lines
3.3 KiB
Python
89 lines
3.3 KiB
Python
import torch
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import math
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from diff_gaussian_rasterization import GaussianRasterizationSettings, GaussianRasterizer
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from scene.gaussian_model import GaussianModel
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from utils.sh_utils import eval_sh
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def render(viewpoint_camera, pc : GaussianModel, pipe, bg_color : torch.Tensor, scaling_modifier = 1.0, override_color = None):
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"""
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Render the scene.
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Background tensor (bg_color) must be on GPU!
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"""
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# Create zero tensor. We will use it to make pytorch return gradients of the 2D (screen-space) means
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screenspace_points = torch.zeros_like(pc.get_xyz, dtype=pc.get_xyz.dtype, requires_grad=True, device="cuda") + 0
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try:
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screenspace_points.retain_grad()
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except:
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pass
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# Set up rasterization configuration
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tanfovx = math.tan(viewpoint_camera.FoVx * 0.5)
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tanfovy = math.tan(viewpoint_camera.FoVy * 0.5)
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raster_settings = GaussianRasterizationSettings(
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image_height=int(viewpoint_camera.image_height),
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image_width=int(viewpoint_camera.image_width),
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tanfovx=tanfovx,
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tanfovy=tanfovy,
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bg=bg_color,
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scale_modifier=scaling_modifier,
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viewmatrix=viewpoint_camera.world_view_transform,
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projmatrix=viewpoint_camera.full_proj_transform,
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sh_degree=pc.active_sh_degree,
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campos=viewpoint_camera.camera_center,
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prefiltered=False
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)
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rasterizer = GaussianRasterizer(raster_settings=raster_settings)
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means3D = pc.get_xyz
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means2D = screenspace_points
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opacity = pc.get_opacity
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# If precomputed 3d covariance is provided, use it. If not, then it will be computed from
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# scaling / rotation by the rasterizer.
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scales = None
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rotations = None
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cov3D_precomp = None
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if pipe.compute_cov3D_python:
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cov3D_precomp = pc.get_covariance(scaling_modifier)
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else:
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scales = pc.get_scaling
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rotations = pc.get_rotation
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# If precomputed colors are provided, use them. Otherwise, if it is desired to precompute colors
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# from SHs in Python, do it. If not, then SH -> RGB conversion will be done by rasterizer.
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shs = None
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colors_precomp = None
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if colors_precomp is None:
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if pipe.convert_SHs_python:
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shs_view = pc.get_features.transpose(1, 2).view(-1, 3, (pc.max_sh_degree+1)**2)
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dir_pp = (pc.get_xyz - viewpoint_camera.camera_center.repeat(pc.get_features.shape[0], 1))
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dir_pp_normalized = dir_pp/dir_pp.norm(dim=1, keepdim=True)
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sh2rgb = eval_sh(pc.active_sh_degree, shs_view, dir_pp_normalized)
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colors_precomp = torch.clamp_min(sh2rgb + 0.5, 0.0)
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else:
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shs = pc.get_features
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else:
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colors_precomp = override_color
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# Rasterize visible Gaussians to image, obtain their radii (on screen).
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rendered_image, radii = rasterizer(
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means3D = means3D,
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means2D = means2D,
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shs = shs,
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colors_precomp = colors_precomp,
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opacities = opacity,
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scales = scales,
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rotations = rotations,
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cov3D_precomp = cov3D_precomp)
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# Those Gaussians that were frustum culled or had a radius of 0 were not visible.
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# They will be excluded from value updates used in the splitting criteria.
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return {"render": rendered_image,
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"viewspace_points": screenspace_points,
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"visibility_filter" : radii > 0,
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"radii": radii}
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