Add back Havok physics extensions (LL TPV sublicence) - mesh physics analysis & pathfinding #218

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opened 2026-09-30 21:58:12 +00:00 by sky_line · 0 comments

sky_line commented

2026-09-30 21:58:12 +00:00

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Removed: the havok-source, llphysicsextensions_source and llphysicsextensions_tpv 3p packages (Linden Lab private downloads that failed in every Windows build) and the Havok CMake paths. We have always built with the open stub (llphysicsextensions_stub), so nothing that worked before stopped working.

What Havok provides in LL's viewer

Mesh uploader physics: Havok convex decomposition ("Analyze") and physics-mesh simplification. We already replace the decomposition with V-HACD (llconvexdecompositionvhacd, the "physics analysis vhacd" panel). Havok's simplification step is the part we lack.
Pathfinding visualisation: the Pathfinding console's navmesh / walkability / obstacle rendering (LLPathingLib). With the stub, the console works for linkset/character management but can't draw the navmesh.
Region physics itself is server-side and unaffected.

To add it back

Linden Lab offers a Havok sublicence to TPV developers (the llphysicsextensions_tpv prebuilt). It requires an agreement with LL; ask during the TPV Directory application (#214).
Alternatively, draw the navmesh ourselves from the navmesh asset the region already sends (Recast-style rendering), with no Havok needed.
Restore the CMake HAVOK_TPV path from history if we get the sublicence.

Removed: the `havok-source`, `llphysicsextensions_source` and `llphysicsextensions_tpv` 3p packages (Linden Lab private downloads that failed in every Windows build) and the Havok CMake paths. We have always built with the **open stub** (`llphysicsextensions_stub`), so nothing that worked before stopped working. ## What Havok provides in LL's viewer - **Mesh uploader physics:** Havok convex decomposition ("Analyze") and physics-mesh simplification. **We already replace the decomposition with V-HACD** (`llconvexdecompositionvhacd`, the "physics analysis vhacd" panel). Havok's simplification step is the part we lack. - **Pathfinding visualisation:** the Pathfinding console's navmesh / walkability / obstacle rendering (LLPathingLib). With the stub, the console works for linkset/character management but can't draw the navmesh. - Region physics itself is **server-side** and unaffected. ## To add it back - Linden Lab offers a Havok sublicence to TPV developers (the `llphysicsextensions_tpv` prebuilt). It requires an agreement with LL; ask during the TPV Directory application (#214). - Alternatively, draw the navmesh ourselves from the navmesh asset the region already sends (Recast-style rendering), with no Havok needed. - Restore the CMake HAVOK_TPV path from history if we get the sublicence.

sky_line referenced this issue from a commit

2026-10-01 00:07:00 +00:00

Drop private 3p packages; TPV disclosures, Slipstream licensing and docs

sky_line added this to the Slipstream project

2026-10-06 15:04:15 +00:00

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sky_line/Slipstream#218

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