arkavo-org/VRMMetalKit

VRM Metal

Stars: 6
Forks: 2
Open beginner issues: 6
Indexed issues: 80
Avg merge: 1d 6h
Merged PRs (30d): 13

Dominant language: Swift
License: Apache-2.0
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

80 open issues indexed

vrm-author-cli corpus evidence: follow-ups, and whether the authoring tool should split out Open

documentation technical-debt

Difficulty 5/5 Over a week Newbie friendliness 20/100

arkavo-org/VRMMetalKit#440 · Opened Sep 12, 2026
SpringBone collider evaluation order: VMK uses one global authored-order buffer; UniVRM/three-vrm use per-spring group-major lists Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#416 · Opened Aug 17, 2026
visionOS sample host: turn the build-only CI action into a real render assertion Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

arkavo-org/VRMMetalKit#399 · Opened Aug 7, 2026
Cloth-fidelity post-merge cleanups (from final review) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#383 · Opened Aug 6, 2026
SpringBone: applyVelocityCorrection keeps push-out-manufactured outward velocity — joints coast 4-8cm after hard contact Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

arkavo-org/VRMMetalKit#382 · 1 comment · Opened Aug 6, 2026
SpringBone: synthetic colliders model each segment as one radius; the body surface varies 3-4x Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#381 · 1 comment · Opened Aug 5, 2026
PipelineBinaryArchive: guard serialize() on the iOS 27 simulator — Metal abort is uncatchable Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

arkavo-org/VRMMetalKit#371 · Opened Jul 2, 2026
iOS 27.0 beta simulator: Metal framework asserts crash PipelineBinaryArchive + readable-depth tests on Xcode Cloud Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

arkavo-org/VRMMetalKit#370 · 1 comment · Opened Jul 2, 2026
Architecture: extract VRM authoring (VRMBuilder) out of VMK — keep VMK render-only Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

arkavo-org/VRMMetalKit#368 · Opened Jun 19, 2026
Indirect Command Buffers (ICB) for multi-avatar crowd rendering Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 42/100

arkavo-org/VRMMetalKit#362 · Opened Jun 17, 2026
MASK-aware depth prepass for VRM alpha-cutout materials Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#360 · 1 comment · Opened Jun 17, 2026
ASTC texture compression for MToon materials Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#359 · Opened Jun 17, 2026
Multi-avatar residency: GPU-native cache container + tiered residency (tens of VRMs concurrent) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

arkavo-org/VRMMetalKit#337 · 2 comments · Opened Jun 10, 2026
ARKit drivers: complete Phase-4 TODOs (confidence-based face source selection, shoulder/arm T-pose calibration) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#329 · Opened Jun 7, 2026
MToon giEqualizationFactor: spec-accurate GI (currently an artistic lit/shade-mix proxy) Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#328 · 1 comment · Opened Jun 7, 2026
Multi-model overlapping-avatar artifact (GoM): depth-bias-bleed hypothesis refuted; needs reporter scene to reproduce Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

arkavo-org/VRMMetalKit#302 · 2 comments · Opened May 29, 2026
Add mutation testing to validate test-suite effectiveness Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

arkavo-org/VRMMetalKit#282 · Opened May 21, 2026
VRMExpressionController: add public getter for preset/custom weights Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

arkavo-org/VRMMetalKit#273 · Opened May 18, 2026
GLTFMetalKit: actor-isolate GLTFRenderer or document single-threaded contract Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

arkavo-org/VRMMetalKit#252 · Opened May 16, 2026
GLTFMetalKit: PrimitiveBuildResult double-stores base mesh data when morphed Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

arkavo-org/VRMMetalKit#251 · Opened May 16, 2026
GLTFMetalKit: persistent triple-buffered morph vertex buffer pool Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

arkavo-org/VRMMetalKit#247 · Opened May 16, 2026
GLTFMetalKit: replace fixed-delta diffuse irradiance with Hammersley importance sampling Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

arkavo-org/VRMMetalKit#249 · Opened May 16, 2026
GLTFMetalKit: light-direction transform under non-uniform scale Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

arkavo-org/VRMMetalKit#250 · Opened May 16, 2026
GLTFMetalKit: KHR_texture_transform + other widely-adopted KHR extensions Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

arkavo-org/VRMMetalKit#242 · Opened May 16, 2026
GLTFCore: move computeWorldMatrices() from GLTFMetalKit so VRMMetalKit can also use the primitive Open

Difficulty 2/5 Under an hour Newbie friendliness 78/100

arkavo-org/VRMMetalKit#243 · Opened May 16, 2026
GLTFMetalKit: MikkTSpace tangent generation for normal-mapped meshes without authored TANGENT Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

arkavo-org/VRMMetalKit#244 · Opened May 16, 2026
GLTFMetalKit: GPU compute morph kernel for high-vertex-count assets Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

arkavo-org/VRMMetalKit#245 · Opened May 16, 2026
VRMMetalKit: rename VRMMesh / VRMPrimitive / VRMMaterial to VRMRenderable* for clarity vs GLTFMetalKit Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

arkavo-org/VRMMetalKit#246 · Opened May 16, 2026
VRMC_springBone_extended_collider parsed but applied inconsistently — chaotic per-variant clustering, doesn't track swept axes Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

arkavo-org/VRMMetalKit#237 · 7 comments · Opened May 16, 2026
MToon rim lighting: high-mix rim-extent residual — VMK's rim doesn't wrap the unlit silhouette at rimLightingMix→1 (SSIM ~0.949 vs 0.95, only at max rim) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

arkavo-org/VRMMetalKit#226 · 3 comments · Opened May 13, 2026
Loading pipeline: synchronous texture decode, buffer normalization, joint sanitization Open

high performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#223 · Opened May 13, 2026
SpringBone physics does CPU-side interpolation and array rebuilds every frame Open

high performance

Difficulty 5/5 Over a week Newbie friendliness 42/100

arkavo-org/VRMMetalKit#222 · Opened May 13, 2026
Outline pass doubles draw calls and bypasses state cache Open

medium performance

Difficulty 5/5 Over a week Newbie friendliness 38/100

arkavo-org/VRMMetalKit#221 · Opened May 13, 2026
MToon fragment shader is ALU/texture heavy with no early-exit Open

high performance

Difficulty 4/5 3-5 days Newbie friendliness 45/100

arkavo-org/VRMMetalKit#220 · Opened May 13, 2026
Skinning matrix palette recomputed from scratch every frame Open

medium performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#219 · Opened May 13, 2026
Per-primitive morph active-set sort is O(m log m) every frame Open

medium performance

Difficulty 3/5 1-2 days Newbie friendliness 62/100

arkavo-org/VRMMetalKit#218 · Opened May 13, 2026
Morph target system creates one compute encoder per primitive per frame Open

high performance

Difficulty 5/5 Over a week Newbie friendliness 45/100

arkavo-org/VRMMetalKit#217 · Opened May 13, 2026
Per-frame render-item string classification and cache inefficiency Open

high performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

arkavo-org/VRMMetalKit#216 · Opened May 13, 2026
Model lock serializes animation threads during full render encode Open

concurrency high performance

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#215 · Opened May 13, 2026
VRMNode: add localTranslation/localScale setters, deprecate raw T/R/S writes Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

arkavo-org/VRMMetalKit#212 · Opened May 13, 2026
VRMNode: amortize updateLocalMatrix via dirty flag in updateWorldTransform Open

Difficulty 4/5 3-5 days Newbie friendliness 67/100

arkavo-org/VRMMetalKit#211 · Opened May 13, 2026
MToon debug mode 15 uses Half-Lambert while production path uses raw Lambert Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

arkavo-org/VRMMetalKit#209 · Opened May 13, 2026
Epic: Romero-style performance roadmap (10 prioritized optimizations) Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

arkavo-org/VRMMetalKit#200 · Opened May 13, 2026
Crowd: GPU hardware occlusion queries for background avatars Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#199 · 1 comment · Opened May 13, 2026
ARKit: route Kalman face smoothing through MPS instead of CPU Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

arkavo-org/VRMMetalKit#198 · Opened May 13, 2026
MToon: demote fragment shader intermediates to half precision Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

arkavo-org/VRMMetalKit#196 · Opened May 13, 2026
Vertex layout: split VRMVertex into position-only + attribute buffers Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#195 · Opened May 13, 2026
MorphTargetCompute: dispatch over per-target affected vertex ranges Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

arkavo-org/VRMMetalKit#194 · Opened May 13, 2026
MToon: specialize shader pipelines via [[function_constant]] feature flags Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

arkavo-org/VRMMetalKit#193 · Opened May 13, 2026
Renderer: merge color + outline + silhouette into a single tile-memory render pass Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

arkavo-org/VRMMetalKit#192 · Opened May 13, 2026

A short digest of beginner-friendly GitHub issues.