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fix(assets): sync spec noise amplitudes and gradient radius

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GLSL sample comments now say ±0.05 / ±0.075 matching the code and
spec table. Implementation notes gradient radius updated from 6-8
to 3-4 tiles.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-02-28 23:21:10 +01:00
co-authored by Claude Opus 4.6
parent b9b9c923a0
commit a1bdab949b
1 changed files with 3 additions and 3 deletions
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docs/architecture/fog-shader-spec.md
+3 -3
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@@ -126,9 +126,9 @@ The shader determines fog state per pixel based on the visibility and exploratio
Two explored sub-zones are distinguished by the blurred `vis` value (proximity to the forward cone):
```glsl
// Light fog noise — fast cycle (8-10s), subtle ±0.04 breathing
// Light fog noise — fast cycle (8-10s), subtle ±0.05 breathing
float noise_fast = texture(noise_tex, tile * 0.03 + vec2(time * 0.11, time * 0.07)).r;
// Deep fog noise — slow cycle (15-20s), more pronounced ±0.08 breathing
// Deep fog noise — slow cycle (15-20s), more pronounced ±0.075 breathing
float noise_slow = texture(noise_tex, tile * 0.02 + vec2(time * 0.05, time * 0.035)).r;
// Light fog: alpha 0.25-0.35 (near cone gradient)
@@ -252,7 +252,7 @@ Per tick (in _process or on snapshot signal):
1. **Start with the shader.** Get a basic 2-layer shader working (clear vs opaque) on a ColorRect, then incrementally add layers.
2. **Coordinate mapping is the hardest part.** Getting screen pixels → world tiles → texture UVs correct requires careful math. Test with a known map layout.
3. **Use Godot's NoiseTexture2D** resource for the Perlin noise rather than computing it in the shader. Pass it as a uniform. Scroll the UV offset with TIME for animation.
4. **The gradient edge** (Layer 1, 6-8 sim tiles) is the most visible quality differentiator. Use `smoothstep()` with the distance from the nearest non-visible tile. This may require encoding distance-to-edge in the visibility texture rather than binary 0/255.
4. **The gradient edge** (Layer 1, 3-4 tile radius via 7x7 Gaussian) is the most visible quality differentiator. Use `smoothstep()` with the distance from the nearest non-visible tile. This may require encoding distance-to-edge in the visibility texture rather than binary 0/255.
5. **Fog entities are Sprint 7+ (#431).** For this sprint, just get the 5-layer fog shader working. The FogEntities node can be empty.
6. **Test with the existing sim_bridge test mode** — it provides a visible_positions Dictionary with a 4-tile radius and Bresenham LOS. Good enough to validate the shader.