3D Gaussian Splatting & Spatial Computing: Moving Beyond NeRFs for Sub-15ms Enterprise Telepresence

// High-performance tile-based forward splatting kernel
__global__ void __launch_bounds__(BLOCK_SIZE)
RenderTilesKernel(
    const uint2* __restrict__ tile_ranges,
    const uint32_t* __restrict__ sorted_gaussian_indices,
    const float2* __restrict__ projected_centers,
    const float4* __restrict__ conic_opacity,
    const half3* __restrict__ rgb_colors,
    half4* __restrict__ output_framebuffer,
    int image_width, int image_height
) {
    uint32_t tile_id = blockIdx.y * gridDim.x + blockIdx.x;
    uint2 range = tile_ranges[tile_id];
    
    // Shared memory cache for current tile's Gaussian descriptors
    __shared__ int collected_id[BLOCK_SIZE];
    __shared__ float2 collected_xy[BLOCK_SIZE];
    __shared__ float4 collected_conic[BLOCK_SIZE];
    __shared__ half3 collected_color[BLOCK_SIZE];

    float T = 1.0f; // Current pixel transmittance
    half3 C = make_half3(0.0f, 0.0f, 0.0f); // Accumulated radiance
    
    // Front-to-back alpha blending loop with early ray termination
    for (int i = range.x; i < range.y && T > 0.001f; i += BLOCK_SIZE) {
        // Warp-level synchronous memory load and accumulation...
    }
}

import { SplatBuffer, GaussianScene, SpatialAnchor } from '@alector/spatial-core';

export class EnterpriseSpatialViewer {
  private device: GPUDevice;
  private scene: GaussianScene;

  async mountHangarScene(sceneUrl: string, anchorCoordinates: SpatialAnchor) {
    // Stream compressed .ply splat buffer with progressive LOD loading
    const buffer = await SplatBuffer.streamFromEdge(sceneUrl, {
      maxOctreeDepth: 6,
      targetFPS: 90
    });

    this.scene = new GaussianScene(this.device, buffer);
    await this.scene.bindSpatialAnchor(anchorCoordinates);
    
    // Start WebXR immersive session with real-time eye-tracked foveation
    return this.scene.startSession({ mode: 'immersive-ar', foveationLevel: 1.5 });
  }
}