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tweak: lower default disk_tilt from 1.318 to 0.45

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At 1.318 rad (~75.5 deg) the disk is nearly vertical: its normal points
almost along +Z while the camera yaw axis is world-Y, so the two axes
sit ~75 deg apart. Orbiting via yaw (a horizontal circle around world-Y)
therefore shears the disk through view -- full circle, squashed ellipse,
edge-on sliver, back circle -- which reads as the disk swinging or the
scene rolling.

0.45 rad (~25.8 deg) brings the disk near-horizontal (normal approx
(0, 0.90, 0.43)), shrinking the yaw-axis / disk-normal misalignment
from ~75 deg to ~26 deg. The swing is correspondingly muted; orbiting
feels like turning around the hole rather than shearing across a wall.

Both defaults are updated in lockstep: BlackHoleParams (the live runtime
default) and BlackHoleUniforms (the bootstrap uniform filled before the
first mirror_params frame).
This commit is contained in:
xfy 2026-07-14 17:06:21 +08:00
parent 3749ee5691
commit e7c45804a4
2 changed files with 2 additions and 2 deletions
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2
src/params.rs
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@ -35,7 +35,7 @@ impl Default for BlackHoleParams {
rs: 1.0,
disk_inner: 3.0,
disk_outer: 15.0,
disk_tilt: 1.318, // ~75.5 deg, matching the reference video
disk_tilt: 0.45, // ~25.8 deg
disk_brightness: 1.0,
disk_rotation_speed: 0.5,
doppler_enabled: true,

2
src/render/material.rs
View File

@ -58,7 +58,7 @@ impl Default for BlackHoleUniforms {
rs: 1.0,
disk_inner: 3.0,
disk_outer: 15.0,
disk_tilt: 1.318,
disk_tilt: 0.45,
disk_brightness: 1.0,
disk_rotation_speed: 0.5,
doppler_strength: 1.0,