Pinned Bag Rigidity Sweep

Score Definitions

score	definition	implementation detail
`stretch_score`	RMS relative edge length change.	For every unique triangle edge, compute `(current_length - rest_length) / rest_length`, then take RMS over all bag edges.
`shear_score`	RMS in-plane triangle distortion.	For each triangle, compute its three internal angle changes from the rest mesh, then take RMS over all triangle angles. Units are radians.
`bend_score`	RMS dihedral angle change.	For every pair of adjacent triangles sharing an edge, compute the change in angle between their face normals from rest, then take RMS. Units are radians.

Five runs vary cloth_tri_ke and cloth_tri_ka over the listed absolute values while keeping cloth_tri_kd fixed at 0.1. The combined video shows the five recordings in one time-synced row.

cloth_tri_ke / cloth_tri_ka: 1000 / 200, 10000 / 2000, 100000 / 20000, 1000000 / 200000, 10000000 / 2000000

cloth_tri_kd: 0.1

edge_ke: 200

substep dt: 0.00166667 s

iterations: 10

frames: 360 @ 60 fps

Combined Video

Stretch Score

Shear Score

Bend Score

Score Summary

cloth_tri_ke	cloth_tri_ka	score	final	peak	mean
1000	200	stretch_score	0.110073	0.222441	0.106909
1000	200	shear_score	0.0728475	0.128237	0.0646225
1000	200	bend_score	0.0115948	0.0211959	0.0109638
10000	2000	stretch_score	0.0151857	0.0235364	0.0145503
10000	2000	shear_score	0.0123304	0.0168088	0.0111086
10000	2000	bend_score	0.0074385	0.0137271	0.00812223
100000	20000	stretch_score	0.00572417	0.00732748	0.00561428
100000	20000	shear_score	0.00511766	0.0104347	0.00572102
100000	20000	bend_score	0.0141702	0.0241625	0.0148596
1000000	200000	stretch_score	0.00541181	0.0078541	0.00545732
1000000	200000	shear_score	0.00491667	0.00834685	0.0060085
1000000	200000	bend_score	0.0453945	0.0741309	0.0448994
10000000	2000000	stretch_score	0.00535968	0.00825275	0.00559437
10000000	2000000	shear_score	0.00484987	0.00900776	0.00587751
10000000	2000000	bend_score	0.177943	0.222024	0.178704

Artifacts

Combined raw data: rigidity_scores_sweep.csv and rigidity_scores_sweep.json.

cloth_tri_ke	cloth_tri_ka	video	csv	json
1000	200	video	csv	json
10000	2000	video	csv	json
100000	20000	video	csv	json
1000000	200000	video	csv	json
10000000	2000000	video	csv	json