Module: Gsplat::Backend::RubyEval3dRasterizer

Defined in:
lib/gsplat/backend/ruby/eval3d_rasterizer.rb

Overview

World-space Gaussian evaluator used by 3DGUT-style rendering.

Constant Summary collapse

ALPHA_CLAMP = 
0.99
ALPHA_SKIP = 
1.0 / 255
TRANSMITTANCE_STOP = 
1e-4

Class Method Summary collapse

Class Method Details

.forward(means, quats, scales, colors, opacities, backgrounds, viewmats:, intrinsics:, width:, height:, tile_size:, offsets:, flatten_ids:, camera_model:, use_hit_distance: false, return_normals: false) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/ParameterLists



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# File 'lib/gsplat/backend/ruby/eval3d_rasterizer.rb', line 14

def forward(means, quats, scales, colors, opacities, backgrounds, viewmats:, intrinsics:,
            width:, height:, tile_size:, offsets:, flatten_ids:, camera_model:,
            use_hit_distance: false, return_normals: false)
  # rubocop:enable Metrics/AbcSize, Metrics/ParameterLists
  values = validate_inputs(
    means, quats, scales, colors, opacities, backgrounds, viewmats, intrinsics,
    width, height, offsets, flatten_ids, camera_model
  )
  means, quats, scales, colors, opacities, backgrounds, viewmats, intrinsics = values
  camera_count, gaussian_count, channels = colors.shape
  rendered = means.class.zeros(camera_count, height, width, channels)
  alphas = means.class.zeros(camera_count, height, width, 1)
  rendered_normals = means.class.zeros(camera_count, height, width, 3)
  rotations = Math::Quaternion.to_rotmat(quats)
  camera_count.times do |camera|
    frame = camera_frame(viewmats[camera, true, true])
    height.times do |row|
      width.times do |column|
        tile_x = column / tile_size
        tile_y = row / tile_size
        range = intersection_range(offsets, flatten_ids, camera, tile_x, tile_y)
        ray = ray_for_pixel(frame, intrinsics[camera, true, true], column, row)
        pixel, transmittance, pixel_normal = composite_pixel(
          means, rotations, scales, colors, opacities, flatten_ids, range,
          camera, gaussian_count, ray, use_hit_distance, return_normals
        )
        pixel += backgrounds[camera, true] * transmittance if backgrounds
        rendered[camera, row, column, true] = pixel
        alphas[camera, row, column, 0] = 1 - transmittance
        rendered_normals[camera, row, column, true] = pixel_normal
      end
    end
  end
  [rendered, alphas, rendered_normals]
end