EndoGSim: Physics-Aware 4D Dynamic Endoscopic Scene Simulations via MLLM-Guided Gaussian Splatting

Beilei Cui; Changjing Liu; Hongliang Ren; Long Bai; Yiming Huang

REVIEW 2 major objections 2 minor 1 cited by

EndoGSim: Physics-Aware 4D Dynamic Endoscopic Scene Simulations via MLLM-Guided Gaussian Splatting

T0 review · 2 major / 2 minor · reviewed 2026-05-20 · grok-4.3

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗

Pith's one-line read A framework initializes material properties via MLLM then refines them with differentiable MPM inside 4D Gaussian Splatting to produce physics-aware endoscopic scene simulations.

desk verdict The paper's main move is wiring an MLLM to seed material parameters into 4D Gaussian splatting and then refining them with differentiable MPM for endoscopic scenes. read the letter →

arxiv 2605.16022 v1 pith:3Y3IL25E submitted 2026-05-15 cs.CV

Changjing Liu , Yiming Huang , Long Bai , Beilei Cui , Hongliang Ren This is my paper

classification cs.CV

keywords endoscopicscenesimulation4DGaussiansplattingphysics-awarereconstructionmaterialpointmethodmulti-modallargelanguagemodelsrobot-assistedsurgerydynamicdifferentiablephysics

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper introduces EndoGSim, a unified method that reconstructs and physically simulates dynamic endoscopic scenes for robot-assisted surgery. It represents deformable tissues and tools with 4D Gaussian Splatting augmented by segmentation and depth estimates. An object-wise material field starts with parameters suggested by a pre-trained multi-modal large language model and then tunes those parameters through a differentiable Material Point Method driven by both rendered images and optical flow. The resulting simulations show higher visual fidelity and better physical accuracy than prior techniques on both public and private datasets. If the method holds, it supplies the missing physics layer needed for realistic surgical planning and training.

What carries the argument

The object-wise material field that initializes material parameters via MLLM and refines them through differentiable Material Point Method under joint supervision from rendered images and optical flow.

What would settle it

Observed tissue deformations under controlled instrument forces in real endoscopic video that systematically mismatch the forces predicted by the refined material field would disprove the physical accuracy.

Watch

Extended reading notes

Core claim

The integration of 4D Gaussian Splatting with an object-wise material field, whose parameters are initialized by pre-trained MLLMs and refined through a differentiable Material Point Method under joint supervision from rendered images and optical flow, produces physics-aware reconstruction and physical simulation of endoscopic scenes.

Load-bearing premise

Pre-trained MLLMs can provide reliable initial material parameters for endoscopic tissues and tools which are then successfully refined by the differentiable MPM under joint image and optical flow supervision.

Editorial extensions

If this is right

Supplies explicit physical descriptions of tissue and tool dynamics missing from purely visual endoscopic reconstructions.
Delivers higher simulation fidelity and physical accuracy than prior methods on both open-source and in-house datasets.
Supports improved planning, training, and control loops in robot-assisted minimally invasive surgery.
Allows automatic inference of material properties without manual tuning for each new scene.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

The same pipeline could generate large amounts of physically consistent synthetic training data for surgical robots.
Extending the material field to include contact forces between tools and tissue would enable predictive simulation of instrument-tissue interactions.
The MLLM-plus-differentiable-physics pattern may transfer to other domains that need both semantic priors and measurable dynamics, such as soft robotics or fluid simulation.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Desk Editor's Note

read the letter

The core contribution is a pipeline that takes 4D Gaussian splatting for dynamic endoscopic reconstruction and adds an object-wise material field. The field starts with parameter guesses from a pre-trained MLLM and gets updated by a differentiable Material Point Method under image and optical-flow losses. This is a fresh combination for surgical simulation work, where most prior efforts stop at visual fidelity and leave physics out. It directly targets the gap between reconstruction and usable simulation for robot-assisted procedures, which is a practical need in training and planning tools. The approach is straightforward in outline and builds on established pieces like 4DGS and MPM without obvious reinvention of those components. Validation is reported on both public and in-house endoscopic datasets, with claims of better simulation fidelity and physical accuracy than existing methods. That framing makes sense for the target audience in medical robotics. The soft spot is the initialization step. Pre-trained MLLMs have no built-in knowledge of soft-tissue stiffness or tool mechanics, so the starting guesses could be off. The paper needs to show that the joint supervision actually recovers accurate constitutive parameters rather than just fitting the 2D observations. Without detailed ablations on how much the MPM refinement corrects bad initials, or quantitative checks against ground-truth material values, the physical-accuracy advantage stays hard to assess. The optical-flow signal is also under-constrained for 3D deformation behavior, which could mask issues. This work is aimed at researchers building physics-aware simulators for minimally invasive surgery. A reader working on 4D reconstruction or surgical robotics would get value from the integration idea and the dataset experiments. It is coherent enough on its own terms to warrant a serious referee, even if the physical claims require tighter evidence in revision.

Referee Report

2 major / 2 minor

Summary. The paper proposes EndoGSim, a unified framework for physics-aware 4D dynamic endoscopic scene reconstruction and simulation. It combines 4D Gaussian Splatting (4DGS) with pre-trained segmentation and depth estimation to represent deformable tissues and tools, introduces an object-wise material field initialized via Multi-modal Large Language Models (MLLMs), and refines material parameters through a differentiable Material Point Method (MPM) under joint supervision from rendered images and optical flow. The method is validated on open-source and in-house datasets and claims superior simulation fidelity and physical accuracy over state-of-the-art approaches for robot-assisted surgical applications.

Significance. If the central claims hold, the work would represent a meaningful step toward bridging visual 4D reconstruction with physics-based simulation in endoscopic scenes. The integration of MLLM-guided initialization with differentiable MPM refinement could enable more realistic deformable tissue modeling, with direct relevance to downstream tasks such as surgical planning and robot control in minimally invasive procedures.

major comments (2)

[§3.3] §3.3 (Object-wise Material Field): The initialization of biomechanical parameters (e.g., Young's modulus, Poisson ratio) for endoscopic tissues and instruments via pre-trained MLLMs is presented as automatic and reliable, yet no experiments quantify the accuracy of these initial values against known tissue properties or demonstrate recovery when initial guesses are deliberately perturbed. This is load-bearing for the physical-accuracy claim because 2-D image and optical-flow losses may under-constrain 3-D constitutive behavior.
[§5.2] §5.2 (Ablation Studies and Quantitative Results): The reported gains in simulation fidelity are attributed to the joint image + optical-flow supervision of the differentiable MPM, but the manuscript lacks an ablation that isolates the MPM refinement step (e.g., comparing MLLM initialization alone versus full refinement, or random versus MLLM initialization). Without this, it is unclear whether the final parameters correspond to real physics or simply overfit the visual losses.

minor comments (2)

[§4.1] Figure 4 caption and §4.1: The description of how MLLM prompts are constructed for material inference is terse; expanding the prompt template and providing example outputs would improve reproducibility.
[§2] Related Work (§2): The discussion of prior physics-informed neural rendering and differentiable simulation methods could cite additional recent works on MPM in medical imaging to better situate the contribution.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback and for highlighting areas where additional evidence would strengthen the physical-accuracy claims. We address each major comment below and have revised the manuscript accordingly to improve clarity and rigor.

read point-by-point responses

Referee: [§3.3] §3.3 (Object-wise Material Field): The initialization of biomechanical parameters (e.g., Young's modulus, Poisson ratio) for endoscopic tissues and instruments via pre-trained MLLMs is presented as automatic and reliable, yet no experiments quantify the accuracy of these initial values against known tissue properties or demonstrate recovery when initial guesses are deliberately perturbed. This is load-bearing for the physical-accuracy claim because 2-D image and optical-flow losses may under-constrain 3-D constitutive behavior.

Authors: We agree that direct quantification of MLLM initialization accuracy and explicit perturbation-recovery experiments would provide stronger support for the physical claims. Obtaining reliable ground-truth biomechanical parameters for in-vivo endoscopic tissues is difficult because such measurements are rarely available in public datasets or the literature. Nevertheless, we have added a new perturbation study in the revised Section 5.2: initial material values are deliberately offset by ±20 % from the MLLM outputs, after which the differentiable MPM is run to convergence. The refined parameters yield measurably lower forward-simulation error (image and optical-flow metrics) than the perturbed initials, indicating that the refinement step corrects for initialization inaccuracies. Regarding potential under-constraint by 2-D losses, the object-wise material field together with joint image-plus-flow supervision and the MPM’s constitutive constraints provide additional regularization; this is evidenced by our method’s superior generalization on held-out sequences compared with purely visual baselines. revision: yes
Referee: [§5.2] §5.2 (Ablation Studies and Quantitative Results): The reported gains in simulation fidelity are attributed to the joint image + optical-flow supervision of the differentiable MPM, but the manuscript lacks an ablation that isolates the MPM refinement step (e.g., comparing MLLM initialization alone versus full refinement, or random versus MLLM initialization). Without this, it is unclear whether the final parameters correspond to real physics or simply overfit the visual losses.

Authors: We acknowledge that an explicit isolation of the MPM refinement contribution is necessary to address concerns about overfitting versus genuine physical improvement. In the revised manuscript we have expanded the ablation table in Section 5.2 with three additional configurations: (i) MLLM initialization without any MPM refinement, (ii) random initialization followed by MPM refinement, and (iii) the full MLLM-plus-MPM pipeline. Quantitative results show that MPM refinement alone improves simulation fidelity over initialization-only baselines, while MLLM initialization yields better starting points and faster convergence than random initialization. Cross-validation on unseen sequences further indicates that the refined parameters do not merely overfit the training losses but generalize, supporting that the final values reflect physically plausible behavior rather than pure visual overfitting. revision: yes

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; derivation remains self-contained

full rationale

The paper's central pipeline initializes an object-wise material field from a pre-trained MLLM and refines parameters via differentiable MPM under image and optical-flow supervision. This does not reduce by construction to the inputs: the MLLM supplies an external starting point drawn from general multimodal training rather than a fitted quantity internal to the endoscopic data, and the subsequent optimization is driven by explicit rendering losses. No self-definitional loops, fitted-input predictions, load-bearing self-citations, or ansatz smuggling appear in the described derivation. The reported gains in simulation fidelity therefore rest on the empirical success of the joint optimization rather than tautological equivalence to prior quantities.

Assumptions & free parameters 0 free parameters · 1 assumptions · 1 invented entities

The central claim rests on the effectiveness of MLLM for material initialization and the ability of differentiable MPM to refine parameters under rendering and flow losses; these are treated as domain assumptions rather than derived results.

assumptions (1)

domain assumption Pre-trained segmentation and depth estimation models provide accurate enough representations of deformable tissues and tools to support 4DGS initialization.
Invoked to integrate visual reconstruction with the material field.

invented entities (1)

object-wise material field
purpose: To store and optimize per-object physical parameters initialized by MLLM and refined by MPM.
New component introduced to enable automatic inference of material properties for simulation.

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Cite this review

Pith. "Pith review of EndoGSim: Physics-Aware 4D Dynamic Endoscopic Scene Simulations via MLLM-Guided Gaussian Splatting." pith.science (2026). https://pith.science/paper/3Y3IL25E

@misc{pith2026260516022,
  author       = {Pith},
  title        = {Pith review of: EndoGSim: Physics-Aware 4D Dynamic Endoscopic Scene Simulations via MLLM-Guided Gaussian Splatting},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/3Y3IL25E}},
  note         = {Machine review of arXiv:2605.16022}
}

read the original abstract

In robot-assisted minimally invasive surgery, high-fidelity dynamic endoscopic scene reconstruction and simulation are crucial to enhancing downstream tasks and advancing surgical outcomes. However, existing methods primarily focus on visual reconstruction, lacking physics-based descriptions of the scene required for realistic simulation. We propose a unified framework that achieves physics-aware reconstruction and physical simulation of endoscopic scenes through Multi-modal Large Language Models (MLLMs)-guided Gaussian Splatting. Our approach utilizes 4D Gaussian Splatting (4DGS) integrated with pre-trained segmentation and depth estimation to represent deformable tissues and tools. To achieve automatic inference of physical properties, we introduce an object-wise material field that initializes material parameters via MLLM and refines them through a differentiable Material Point Method (MPM) under joint supervision from rendered images and optical flow. Validated on both open-source and in-house datasets, our framework achieves superior simulation fidelity and physical accuracy compared to state-of-the-art methods, underscoring its potential to advance robot-assisted surgical applications.

Figures

Figures reproduced from arXiv: 2605.16022 by the authors.

**Figure 1.** Overview of our physics-aware framework for surgical scene reconstruction and 4D dynamic simulation with automatic estimation of physical parameters. trained depth and segmentation models to construct a Gaussian splat representation of the surgical scene. Then, we propose an object-wise material field to estimate the physical properties of the tissues and tools. Material parameters are automatically initialized usi… view at source ↗

**Figure 2.** Qualitative results of all methods on EndoNerf, CholecSeg8K, and Porcineendo dataset Qualitative results on the EndoNeRF and PorcineEndo datasets, shown for [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗

**Figure 3.** Qualitative comparison of simulation results from all methods on a sequence of the EndoNeRF dataset, illustrating rendered images and optical flow errors [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗

Figures from the paper (1 more)

**Figure 4.** Figure 4: Ablation on Material Field (MF): quantitative results on EndoNeRF and CholecSeg8K datasets (left), and qualitative comparison with vs. without MF (right). estimation, coarsely initialized via MLLMs-guide estimation and then jointly refined with render and optical flow …

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Forward citations

Cited by 1 Pith paper

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Reviewed May 20, 2026 · model on record in the stance chip above.

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