https://hwan-h-heo.github.io/blogs/ Technical articles on sparse 3D generation, neural rendering, mesh processing, CUDA kernels, and production inference optimization. en https://hwan-h-heo.github.io/blogs/posts/optimizing-sparse-3d-generation-inference/ https://hwan-h-heo.github.io/blogs/posts/optimizing-sparse-3d-generation-inference/ Mon, 27 Jul 2026 00:00:00 GMT en Why generic compiler paths underperform on dynamic sparse 3D generative models—and how null-context attention removal and model-aware CUDA kernels cut inference latency. https://hwan-h-heo.github.io/blogs/posts/varco3d-a-year-in-review-2025-retrospective/ https://hwan-h-heo.github.io/blogs/posts/varco3d-a-year-in-review-2025-retrospective/ Thu, 15 Jan 2026 00:00:00 GMT en How a fast-follower team tracked the evolution of 3D AI to build an in-house generative 3D service—from VecSet VAEs to Voxel-conditioned 3D DiTs. https://hwan-h-heo.github.io/blogs/posts/sdf-and-eikonal-equation/ https://hwan-h-heo.github.io/blogs/posts/sdf-and-eikonal-equation/ Sat, 23 Aug 2025 00:00:00 GMT en A rigorous derivation of why a signed distance field satisfies the Eikonal equation, from its geometric definition to gradient bounds https://hwan-h-heo.github.io/blogs/posts/from-flow-matching-to-optimal-transport-a-physics-based-view-of-generative-models/ https://hwan-h-heo.github.io/blogs/posts/from-flow-matching-to-optimal-transport-a-physics-based-view-of-generative-models/ Sun, 10 Aug 2025 00:00:00 GMT en Why a Straight Line? Unpacking the Physics and Geometry of Rectified Flow https://hwan-h-heo.github.io/blogs/posts/generalized-winding-number/ https://hwan-h-heo.github.io/blogs/posts/generalized-winding-number/ Sat, 09 Aug 2025 00:00:00 GMT en How Generalized Winding Numbers turn imperfect meshes into robust inside–outside tests for signed distance field construction https://hwan-h-heo.github.io/blogs/posts/building-large-3d-generative-model-2-vae-and-dit-deep-dive/ https://hwan-h-heo.github.io/blogs/posts/building-large-3d-generative-model-2-vae-and-dit-deep-dive/ Thu, 10 Jul 2025 00:00:00 GMT en Comparing vecset and sparse-voxel VAE–DiT architectures, from 3D representation and compression to shape-generation design https://hwan-h-heo.github.io/blogs/posts/building-large-3d-generative-model-1-data-pre-processing/ https://hwan-h-heo.github.io/blogs/posts/building-large-3d-generative-model-1-data-pre-processing/ Wed, 02 Jul 2025 00:00:00 GMT en Preparing training-ready 3D data through watertight mesh conversion, surface sampling, and salient-edge-aware preprocessing https://hwan-h-heo.github.io/blogs/posts/3d-model-viewer-in-web/ https://hwan-h-heo.github.io/blogs/posts/3d-model-viewer-in-web/ Mon, 10 Mar 2025 00:00:00 GMT en Comparing Google model-viewer with a custom Three.js pipeline for embedding, controlling, and presenting 3D assets on the web https://hwan-h-heo.github.io/blogs/posts/an-era-of-3d-generation/ https://hwan-h-heo.github.io/blogs/posts/an-era-of-3d-generation/ Sun, 02 Mar 2025 00:00:00 GMT en Tracing 3D latent diffusion from ShapeVAE to TRELLIS and Hunyuan3D, and comparing how modern systems represent and generate shape https://hwan-h-heo.github.io/blogs/posts/neural-rendering-beyond-photography/ https://hwan-h-heo.github.io/blogs/posts/neural-rendering-beyond-photography/ Mon, 06 Jan 2025 00:00:00 GMT en Applying NeRF and Gaussian Splatting beyond photography to X-ray tomography, plus a lightweight viewer workflow built with Viser. https://hwan-h-heo.github.io/blogs/posts/add-gaussian-splatting-to-your-website/ https://hwan-h-heo.github.io/blogs/posts/add-gaussian-splatting-to-your-website/ Tue, 17 Sep 2024 00:00:00 GMT en A practical Three.js guide to embedding an interactive Gaussian Splatting scene in a website, with no web-graphics background required https://hwan-h-heo.github.io/blogs/posts/dont-rasterize-but-ray-trace-3d-gaussian/ https://hwan-h-heo.github.io/blogs/posts/dont-rasterize-but-ray-trace-3d-gaussian/ Fri, 23 Aug 2024 00:00:00 GMT en How NVIDIA’s 3D Gaussian Ray Tracing replaces splat rasterization with differentiable ray tracing—and what that changes. https://hwan-h-heo.github.io/blogs/posts/a-comprehensive-analysis-of-gaussian-splatting-rasterization/ https://hwan-h-heo.github.io/blogs/posts/a-comprehensive-analysis-of-gaussian-splatting-rasterization/ Mon, 05 Aug 2024 00:00:00 GMT en A ground-up guide to Gaussian Splatting and differentiable rasterization, tracing the mathematics through its CUDA implementation—from projection and covariance to sorting and alpha blending. https://hwan-h-heo.github.io/blogs/posts/radiance-fields-from-deep-based-structure-from-motion/ https://hwan-h-heo.github.io/blogs/posts/radiance-fields-from-deep-based-structure-from-motion/ Sun, 21 Jul 2024 00:00:00 GMT en Comparing VGGSfM and MASt3R as learned Structure-from-Motion pipelines for camera estimation and radiance-field reconstruction. https://hwan-h-heo.github.io/blogs/posts/under-the-3d-geometrically-accurate-2d-gaussian-splatting/ https://hwan-h-heo.github.io/blogs/posts/under-the-3d-geometrically-accurate-2d-gaussian-splatting/ Sun, 02 Jun 2024 00:00:00 GMT en How 2D Gaussian Splatting replaces volumetric blobs with oriented disks to improve surface geometry and mesh reconstruction https://hwan-h-heo.github.io/blogs/posts/is-diffusions-estimated-depth-really-good/ https://hwan-h-heo.github.io/blogs/posts/is-diffusions-estimated-depth-really-good/ Fri, 26 Apr 2024 00:00:00 GMT en Evaluating diffusion-estimated depth by turning Marigold predictions into textured meshes and inspecting their geometric consistency. https://hwan-h-heo.github.io/blogs/posts/can-sora-understand-3d/ https://hwan-h-heo.github.io/blogs/posts/can-sora-understand-3d/ Mon, 26 Feb 2024 00:00:00 GMT en Testing whether video generation models encode enough 3D consistency to reconstruct radiance fields from their synthesized views https://hwan-h-heo.github.io/blogs/posts/can-nerf-be-used-in-game/ https://hwan-h-heo.github.io/blogs/posts/can-nerf-be-used-in-game/ Thu, 30 Nov 2023 00:00:00 GMT en Examining the quality, rendering, and production constraints that limit NeRF in games—and the workarounds available today https://hwan-h-heo.github.io/blogs/posts/instant-ngp-review-re-implementation/ https://hwan-h-heo.github.io/blogs/posts/instant-ngp-review-re-implementation/ Thu, 02 Feb 2023 00:00:00 GMT en Reviewing Instant-NGP’s multi-resolution hash encoding and rebuilding its NeRF pipeline step by step in PyTorch https://hwan-h-heo.github.io/blogs/posts/why-positional-encoding-makes-nerf-more-powerful/ https://hwan-h-heo.github.io/blogs/posts/why-positional-encoding-makes-nerf-more-powerful/ Sun, 28 Nov 2021 00:00:00 GMT en Review of Fourier Features Let Networks Learn High-Frequency Functions https://hwan-h-heo.github.io/blogs/posts/change-of-basis/ https://hwan-h-heo.github.io/blogs/posts/change-of-basis/ Fri, 10 Sep 2021 00:00:00 GMT en Diagonalization, Matrix Decomposition and Principal Component Analysis (PCA) https://hwan-h-heo.github.io/blogs/posts/linear-system/ https://hwan-h-heo.github.io/blogs/posts/linear-system/ Thu, 09 Sep 2021 00:00:00 GMT en Building intuition for linear systems and transformations through matrices, basis vectors, and geometric mappings https://hwan-h-heo.github.io/blogs/posts/3d-stereo-vision-and-epipolar-geometry/ https://hwan-h-heo.github.io/blogs/posts/3d-stereo-vision-and-epipolar-geometry/ Wed, 02 Jun 2021 00:00:00 GMT en From camera projection to stereo correspondence, deriving the epipolar geometry used to recover 3D structure from two views. https://hwan-h-heo.github.io/blogs/posts/homography-and-image-alignment/ https://hwan-h-heo.github.io/blogs/posts/homography-and-image-alignment/ Sun, 02 May 2021 00:00:00 GMT en How image transformations, homographies, feature correspondences, and alignment connect in practical computer vision pipelines. https://hwan-h-heo.github.io/blogs/posts/feature-extraction-and-detection/ https://hwan-h-heo.github.io/blogs/posts/feature-extraction-and-detection/ Fri, 02 Apr 2021 00:00:00 GMT en A practical tour of image gradients, Sobel and LoG filters, and the feature detection principles built on top of them. https://hwan-h-heo.github.io/blogs/posts/image-filter-and-morphology/ https://hwan-h-heo.github.io/blogs/posts/image-filter-and-morphology/ Tue, 02 Mar 2021 00:00:00 GMT en A practical introduction to spatial image filters and morphology, including erosion, dilation, opening, and closing.