[ArtStudio P3] Concept + texturing stages — SDXL concept image with safety checker, PBR texturing, stage chaining #349

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2026-07-04T05:10:54Z

spikerj commented

2026-07-04 05:10:54 +00:00

Sub-ticket of epic #346. Depends on #348 (worker + modeling stage running).

What: the two image-generation stages around modeling — concept (text→reference image, feeds image→3D) and texturing (PBR maps onto the generated mesh) — plus automatic stage chaining so a single student submission flows concept → modeling → texturing without re-submission.

Scope:

Concept stage: SDXL-Lightning default (art_pipe models/sdxl_lightning.py), text prompt → reference image artifact; auto-skipped for direct image uploads and text-to-3D models (art_pipe already encodes this skip)
Safety checker is mandatory on every generated image (concept output and texture bakes) before it is stored as a servable artifact — NSFW-flagged output fails the stage with a student-friendly message and flags the asset for staff review; unsafe images never reach GridFS serving paths (minors platform; hard requirement, do not ship this stage without it)
Texturing stage: Hunyuan3DPaint and/or SD-Turbo texture (per model-fit spike) → base color / metallic / roughness maps + textured GLB artifact
Stage chaining: stage.completed handler advances the asset's stage plan and publishes the next stage.requested (orchestration lives in the event handler, mirroring LessonVideoOrchestrator), terminal on failure
Per-stage thumbnails/previews (concept PNG, textured-mesh turntable still) via art_pipe enrichment for the library UI
Re-run support: RestartFromStageCommand from texturing keeps the modeling output (art_pipe stage artifacts are already per-stage)

Note: prompt-side filtering (blocklist/moderation before the job is accepted) is P6 scope; this ticket owns output-side gating. Decide here whether the concept stage's negative-prompt defaults live in worker config or per-asset-type stage plan.

Acceptance: a text-prompt character submission runs concept → modeling → texturing unattended and yields a textured GLB + concept image + previews in the student's library; an NSFW test prompt produces a failed concept stage, no stored image, and a flagged asset.

Sub-ticket of epic #346. Depends on #348 (worker + modeling stage running). **What:** the two image-generation stages around modeling — concept (text→reference image, feeds image→3D) and texturing (PBR maps onto the generated mesh) — plus automatic stage chaining so a single student submission flows concept → modeling → texturing without re-submission. **Scope:** - [ ] Concept stage: SDXL-Lightning default (art_pipe `models/sdxl_lightning.py`), text prompt → reference image artifact; auto-skipped for direct image uploads and text-to-3D models (art_pipe already encodes this skip) - [ ] **Safety checker is mandatory on every generated image** (concept output and texture bakes) before it is stored as a servable artifact — NSFW-flagged output fails the stage with a student-friendly message and flags the asset for staff review; unsafe images never reach GridFS serving paths (minors platform; hard requirement, do not ship this stage without it) - [ ] Texturing stage: Hunyuan3DPaint and/or SD-Turbo texture (per model-fit spike) → base color / metallic / roughness maps + textured GLB artifact - [ ] Stage chaining: `stage.completed` handler advances the asset's stage plan and publishes the next `stage.requested` (orchestration lives in the event handler, mirroring `LessonVideoOrchestrator`), terminal on failure - [ ] Per-stage thumbnails/previews (concept PNG, textured-mesh turntable still) via art_pipe enrichment for the library UI - [ ] Re-run support: `RestartFromStageCommand` from texturing keeps the modeling output (art_pipe stage artifacts are already per-stage) **Note:** prompt-side filtering (blocklist/moderation before the job is accepted) is P6 scope; this ticket owns output-side gating. Decide here whether the concept stage's negative-prompt defaults live in worker config or per-asset-type stage plan. **Acceptance:** a text-prompt character submission runs concept → modeling → texturing unattended and yields a textured GLB + concept image + previews in the student's library; an NSFW test prompt produces a failed concept stage, no stored image, and a flagged asset.

spikerj added the enhancement label 2026-07-04 05:10:54 +00:00