PPISP ablation renders + card

README.md

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+---
+license: cc-by-4.0
+pretty_name: PPISP Scene→Sim Ablation (OFF vs ON)
+task_categories:
+- image-to-image
+tags:
+- 3d-reconstruction
+- gaussian-splatting
+- radiance-fields
+- novel-view-synthesis
+- ppisp
+- nvidia
+- scene-to-sim
+- physical-ai
+size_categories:
+- n<1K
+---
+
+# PPISP Scene→Sim Ablation — OFF vs ON
+
+Evaluation renders from a single controlled ablation of **NVIDIA's PPISP** inside
+Forenly AI's **Scene→Sim** (real-scene → simulation) pipeline.
+
+## What this is
+The same real **3-camera capture** reconstructed with the **same 30,000 training
+iterations**, changing exactly one variable — **PPISP off vs on**.
+
+| Run | Result |
+|-----|--------|
+| PPISP **off** | hazy, washed-out blur; geometry and colour collapse |
+| PPISP **on**  | sharp, colour-correct, stable — **+9.5 dB PSNR** |
+
+## Files
+- `ppisp-off.jpg` — reconstruction render, PPISP off
+- `ppisp-on.jpg` — reconstruction render, PPISP on
+- `ppisp-sidebyside.jpg` — labelled side-by-side (off | on)
+
+## Why it matters
+In Scene→Sim, reconstruction fidelity **is** the training ground: a blurry scene is a
+broken one — geometry the robot can't trust, textures the policy can't read. PPISP
+targets the photometric artifacts (lighting/colour drift) that break radiance-field and
+Gaussian-splatting reconstructions; it works across 3DGS, 3DGUT and NeRFs.
+
+Methods benchmarked in this line of work: **PPISP · 3DGRUT · 2DGS · GOF**.
+
+## Method / credit
+PPISP is NVIDIA's method for physically-plausible compensation of photometric variations
+in radiance fields. This card documents an applied ablation, not the original method.
+
+Interactive viewer: [Space — ppisp-scene2sim](https://huggingface.co/spaces/ForenlyAI/ppisp-scene2sim)
+· Study: https://forenly.ai/lab-study/ppisp
+
+**Forenly AI — The Skill Layer for Humanoids.**