Entry 153

The streams' models clip at their view's divZ

2026-09-26render

Filescrates/piney-draw/src/lib.rscrates/piney-gs/src/convert.rscrates/piney-gs/src/lib.rscrates/piney-stream/src/scene.rscrates/piney-stream/src/draw.rscrates/piney-stream/src/lib.rsdocs/engine/stream.md

The last GAPS drawing item. VU1's unlit rigid program (mc_DrawTriSFast) handles a triangle that is not wholly inside the GS space and w range by its last strip vertex. When that vertex is nearer than the view's divZ (+0x25c) it cuts the triangle at the near plane; otherwise it drops it. piney-gs used a fixed 1000. The streams change it: stream 5's cue 12 sets 500, and stream 15's tasks set 2000 (str0580) and 3000 (str0581). piney-stream tracked these and sent them out as Request::DivZ, but its draws did not use them.

The change

• piney_draw::ModelDraw::div_z, with piney_draw::DIV_Z (1000) as the default that the towns, fields, dungeons, desktop and title pass.
• piney_gs::convert::mmat takes it in place of the constant.
• piney_stream::Scene::div_z: the stream sets it from its tracked divZ before each frame's draw, and the scene's models carry it.

Checks

All 585 workspace tests pass. The streams' fixture comparisons are of draw lists, which the change does not alter. The clip itself is unchanged code with a parameter in place of a constant.