Avoid duplicate OBJ model loads from cachebust_origin

[Gimyoonsoo]

Summary

• Fixes or improves the duplicate OBJ model loading behavior described in Improve 3d model loading to avoid laggy browser #93.
• Keeps the change focused on cache-key normalization so equivalent cache-busted model URLs reuse parsed OBJ results without conflating distinct hosts.

Changes

• Normalize OBJ loader cache keys by removing volatile cachebust and cachebust_origin query parameters.
• Keep fetching the original model URL while allowing equivalent model URLs to reuse the cached parsed object.
• Preserve host identity for absolute and protocol-relative URLs, so //cdn-a.example.com/... and //cdn-b.example.com/... do not collide.
• Keep relative model URLs relative when generating cache keys.
• Add regression coverage for absolute, relative, cache-busted, and protocol-relative model URLs.

Review follow-up

• Addressed the automated review about protocol-relative URL host collisions in the latest branch state.
• The regression coverage now explicitly checks separate protocol-relative hosts.

Testing

• GitHub PR metadata on latest commit 1f05a57: mergeable: true.
• Vercel preview for the latest commit is Ready.
• ..\tools\bun\bun-windows-x64\bun.exe --config ./bunfig.test-no-preload.toml test tests\global-obj-loader-cache-key.test.ts
• Result: passed locally with an uncommitted temporary config that disables the repo preload.
• ..\tools\bun\bun-windows-x64\bun.exe test tests\global-obj-loader-cache-key.test.ts
• Result: failed before running the test body because this local Windows checkout is missing sharp-win32-x64.node required by the default test preload.
• ..\tools\bun\bun-windows-x64\bun.exe x tsc --noEmit
• Result: passed locally.
• ..\tools\bun\bun-windows-x64\bun.exe x biome lint src\hooks\use-global-obj-loader.ts tests\global-obj-loader-cache-key.test.ts
• Result: passed locally.
• ..\tools\bun\bun-windows-x64\bun.exe run build
• Result: passed locally.
• git diff --check
• Result: passed locally.

Notes

• No authentication, payment, database, deployment, or security-sensitive configuration changes were made.
• No secrets, credentials, production data, or security-sensitive information were accessed.

Algora

/claim #93

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 12, 2026 4:46pm

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[Gimyoonsoo]

Pushed a follow-up commit that also normalizes the cachebust query parameter, with focused cache-key coverage for both cachebust and cachebust_origin.