Entry 127

"The streams' fog"

2026-09-25render

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

Seven of the effect tasks 121-125 ported set a fog on the scene's draw environment: streams 2, 3, 4, 7, 13, 16 and 20. None of them was drawn, so those cutscenes had no depth haze.

SetFog

ccDrawEnv::SetFog(near, far, nearRate, farRate, colour) (0x00105820) keeps these values:

• fMax = 2.55 (100 - nearRate) and fMin = 2.55 (100 - farRate);
• fogA and fogB, the line from fMax at near to fMin at far.

The three-argument form (0x00105890) is that with rates 0 and 100: clear to full fog. VU1 fogs every vertex of an object whose fogSW bit 3 is set, at fogB + fogA w, held between the two. The tasks take a few objects out of it: Func_str0001's four sky objects and the others' OBJ_sfp7bac2.

The port

• The fog. Scene::fog is a SceneFog, and Scene::fog_off holds the objects taken out of it. The tasks set both at their start.
• The draw. Each model gets one Fog at its centre's view depth, the approximation the field and dungeon draws already use.
• Stream 4. Func_str0110's cue x3 (SetFog(0, 0, 0, 0, 0)) takes the fog away from the next frame on.

Checked

• scene::tests::fog_lines checks both forms: clear at near, full or held at fMin from far, and the colour bytes.
• Shots.
  • Stream 3's dungeon walls darken to its green-blue with distance.
  • Stream 7's floor takes its tint.
  • Stream 2 still looks as it did.
• The packet fixtures are unchanged: they do not include the models.