Analyze contour-based reference slimming and profile deformation gap; preserve installed 1.0.4
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{
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"schema": 1,
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"date": "2026-10-21",
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"request": "最大瘦脸差异与人物转脸时的变形机制",
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"reference": {
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"plugin_sha256": "6c5d74bc844a5c5f745718b48ea10ec6635d08aa08a5b6dc6e62653980849f8a",
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"arm64_sha256": "f01e8c0b7e2676b2961950b0e48efdd2589af218e4b36de7d39f5d1c76852bfb",
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"metallib_sha256": "4e8c77db8be94ae169337a2e646407f69520b63afb248faa653e0e068237aaae"
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},
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"air_observation": {
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"authority": "static Apple metal-objdump AIR disassembly; not observed shader execution",
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"command": "xcrun metal-objdump --metallib --disassemble-symbols=faceThinFragmentShader <reference default.metallib>",
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"full_output_sha256": "f97705b88f5491057df2117aef457ffca84e11020574cd57742b0670db4484d8",
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"full_output_bytes": 274496,
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"local_output": "build/pose-analysis/face-thin.air.txt",
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"module": "faceThinFragmentShader",
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"module_metallib_offset": "0x5d5e",
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"function": "mssFaceShapePinCoordinate",
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"active_branch": "faceShapeParamsActive selects Shape helper; inactive branch alone selects legacy Thin helper",
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"local_pin_triplets": [
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[
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75,
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74,
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6
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],
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[
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59,
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60,
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13
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],
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[
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74,
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73,
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47
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],
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[
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60,
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61,
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47
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],
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[
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73,
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72,
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47
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],
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[
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61,
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62,
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47
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],
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[
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72,
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71,
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48
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],
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[
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62,
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63,
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48
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],
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[
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71,
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70,
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48
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],
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[
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63,
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64,
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48
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],
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[
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70,
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69,
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49
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],
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[
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64,
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65,
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49
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],
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[
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69,
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68,
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49
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],
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[
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65,
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66,
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49
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],
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[
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68,
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67,
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52
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],
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[
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66,
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67,
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52
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],
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[
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67,
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65,
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47
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]
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],
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"triplet_usage": "first=origin, third=anchor; second unused in thin loop",
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"thin_cpu_scale": 0.025,
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"size_gain": "clamp(280/max(length((P75-P59)*imageSize),2*length((P67-(P74+P60)/2)*imageSize),1),1,2.25)",
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"effective_pin_gain": "clamp(UI thin,0,1) * strengthMultiplier * 0.025 * size_gain",
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"radius": "length(origin-anchor) in normalized image UV",
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"falloff": "clamp(1-length(currentSampleCoordinate-origin)/radius,0,1)",
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"inverse_sample_step": "q = clamp(q-(anchor-origin)*effective_pin_gain*falloff,0,1)",
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"iteration": "17 sequential updates; not 17 independent offsets evaluated at one original coordinate",
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"bounded_negative_findings": [
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"No yaw/roll/pitch input to the checked GPU helpers",
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"No explicit side-view angle gate in the checked thin branch",
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"No explicit eye/nose restore mask in the checked thin branch; each single pin has zero weight at its own anchor"
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],
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"limits": [
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"This is a 2D local landmark deformation, not proof of 3D head pose estimation",
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"Static paths are not a capture of the exact runtime branch used in the supplied screenshots",
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"Other contour controls include fixed horizontal offsets; not all controls share rotation-equivariant behavior"
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]
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},
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"vision_probe": {
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"authority": "Independent public Apple Vision / AVFoundation invocation; no reference app or plug-in executed",
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"script": "scripts/inspect-face-geometry.m",
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"revision": 3,
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"constellation": 76,
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"maximum_dimension": 1280,
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"coordinate_system": "full-image normalized, y up",
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"region_indices": {
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"contour": [
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59,
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60,
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61,
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72,
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73,
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74,
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75
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],
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"innerLips": [
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42,
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40,
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43,
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45,
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41,
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44
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],
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"leftEye": [
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0,
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4,
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5,
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1,
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3,
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2
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],
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"leftPupil": [
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6
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],
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"nose": [
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47,
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56,
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54,
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53,
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52,
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51,
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50,
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55
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],
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"noseCrest": [
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46,
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47,
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48,
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49,
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58,
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57
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],
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"outerLips": [
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27,
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39,
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26
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],
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"rightEye": [
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7,
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11,
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12,
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8,
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10,
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9
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],
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"rightPupil": [
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13
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]
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},
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"frames": [
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{
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"time": 0,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 2,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0.7853981852531433
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 4,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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1.5707963705062866
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 6,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 8,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 10,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 12,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 14,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 16,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 18,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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1.5707963705062866
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],
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"pitch_radians": [
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null
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]
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},
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{
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"time": 20,
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"face_count": 1,
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"all_point_counts": [
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76
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],
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"yaw_radians": [
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0.7853981852531433
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],
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"pitch_radians": [
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null
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]
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}
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],
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"result": "All 11 sampled frames returned one face and 76 points; 4s/18s reported yaw approx pi/2; pitch unavailable",
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"privacy": "Source frames, complete landmarks and source path remain ignored under build/pose-analysis/vision and are not included in Git"
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},
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"reconstruction_baseline": {
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"commit": "e03e460a9b3e5ad489aad24095485ba10ceb987d",
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"installed_version": "1.0.4 (6)",
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"root_causes": [
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"thin deformation uses bounding box x/y/size rather than saved contour/nose points",
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"horizontal symmetric inverse warp is applied at full strength for any valid box",
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"no contour/landmark completeness guard or pose metadata preservation",
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"fixed coefficients do not match reference local-pin scaling"
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],
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"direction_check": "Positive thin samples outward and moves image features inward; the sign is not reversed",
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"test_gap": "Existing geometry tests establish pixel changes, extent and persistence, not reference likeness or profile shape preservation"
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},
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"checklist": {
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"why_maximum_slim_differs": "answered: different geometric model, locality and effective strength",
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"how_profile_is_handled": "answered within checked active thin path: projected 2D landmarks, local directions/radii; no established explicit yaw gate",
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"full_native_visual_equivalence": "unverified; screenshots are not a synchronized isolated-parameter capture",
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"product_fix": "not changed by this analysis; installed 1.0.4 retains the reported issue"
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},
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"host_boundary": "User controls Motion/FCP; no UI interaction, host shutdown, app install or plug-in replacement in this analysis."
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}
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