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feat(3d): add Pixal3D multiview generation - #12319
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Support four ordered RGBA views through the native Pixal3D CLI. Wire request validation, distributed staging, discovery, packaging, and a dedicated UI form while preserving single-image TRELLIS. Generate native output in a temporary directory and copy only the validated GLB so texture and mesh sidecars do not accumulate. Assisted-by: Codex:GPT-6
Check file-close errors and report failed temporary-file cleanup. Document trusted paths and the packaged CLI for security analysis. Assisted-by: Codex:gpt-6 golangci-lint gosec
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Let model descriptions wrap without losing the install action offscreen. Give page table rules precedence over the shared table styles. Separate background facet probes from navigation assertions and wait for asynchronous size sorting and masonry layout. Fix the chat fixture clock so runs near midnight keep the expected conversation groups and order. Assisted-by: Codex:gpt-6
Playwright joins adjacent table-cell text. A llama-cpp backend followed by 99 requests then matches p99, although no percentile is shown. Require word boundaries while keeping the absence assertion. Assisted-by: Codex:gpt-6
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Description
Closes #12201.
Add a native Pixal3D backend for generating a GLB from four RGBA PNG views in front/right/back/left order and an explicit mesh scale. The 3D API, distributed file staging, and Studio form support these inputs. The importer installs the nine checksummed model files and manifest from the official quantized repository.
Includes backend discovery, pinned CLI builds and packaging for Linux CPU/CUDA/Vulkan and macOS Metal, and user documentation. Native generation runs in a temporary output directory so PNG and PLY sidecars are removed; only the validated GLB is published.
Notes for Reviewers
Initial support is canonical four-view generation at 1024 resolution. The CLI reloads model weights for each request; this limitation is documented.
Validation completed:
This PR is a draft pending native C++/container builds and real model inference. Browser execution was unavailable because cached Chromium lacks its ELF loader. The full config suite also encounters an existing HTTP 403 while downloading the Hermes fixture; its focused Pixal3D tests pass.
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