Entry 231

The Chaos Gate without fog

2026-09-27render

Filescrates/piney-world/src/gate.rs

Reported from play in Mutation's Dun Loireag: a light blue translucent square stood behind the Chaos Gate's ring.

Finding it

The town was drawn from the far side of the gate with kinds of pieces hidden in turn (a throwaway switch, since removed):

• The hazy patches around the platform are the town's 25 CLOUD puffs (EFF_srzsmo1). Alone they draw as soft round puffs, since the texture's alpha falls to 0 at the corners.
• The square went only with the gate hidden, and then only with the fog off. The viewer, which draws CHGATE unfogged, shows a clean oval.

The cause

ccChgate sets both of its anms (the gate CMP_xmgtwav0 and the circle CMP_xmgtcir0) to SetFogSw(0). The port drew them with the town's depth fog. The portal's plane blends additively with a black border. The fog mixed the town's fog colour (Dun Loireag's 0xf0c080, a light blue) into that border, so the whole square showed. The GS mixes fog before blending, as piney-gs does. Nothing was wrong in the blend itself; the fog was never meant to be on.

Gate::draw now draws both anms with no fog. Infection's towns use the same gate, so they had the same square. The town's own SetFogSw(0) pieces (the sky, the cloud layers, the sun, the water) were already unfogged.