Arena - Revision history

Reskin at 22:16, 17 April 2026

2026-04-17T22:16:40Z

← Older revision		Revision as of 17:16, 17 April 2026
Line 12:		Line 12:
	*Sun appearance: ≈0.74° angular diameter (Range: 0.72° – 0.75°)		*Sun appearance: ≈0.74° angular diameter (Range: 0.72° – 0.75°)

			[[File:visibility.PNG\|thumb]]
	ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?		ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?

Reskin at 13:23, 16 April 2026

2026-04-16T13:23:50Z

← Older revision		Revision as of 08:23, 16 April 2026
Line 9:		Line 9:
	*Surface visibility: ~3 km		*Surface visibility: ~3 km
	*Kármán line: ~165 km		*Kármán line: ~165 km
			*Atmosphere height: 99 km (proportionate to 60 km on Earth)
	*Sun appearance: ≈0.74° angular diameter (Range: 0.72° – 0.75°)		*Sun appearance: ≈0.74° angular diameter (Range: 0.72° – 0.75°)

Reskin at 17:39, 15 April 2026

2026-04-15T17:39:25Z

← Older revision		Revision as of 12:39, 15 April 2026
Line 9:		Line 9:
	*Surface visibility: ~3 km		*Surface visibility: ~3 km
	*Kármán line: ~165 km		*Kármán line: ~165 km
			*Sun appearance: ≈0.74° angular diameter (Range: 0.72° – 0.75°)

	ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?		ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?

Reskin at 17:35, 14 April 2026

2026-04-14T17:35:29Z

← Older revision		Revision as of 12:35, 14 April 2026
Line 1:		Line 1:
	[[Image:Venus-Atmosphere.~~jpg~~\|thumb\|Venus's Middle and Lower Atmospheres]]		[[Image:Venus-Atmosphere.gif\|thumb\|Venus's Middle and Lower Atmospheres]]

	So the game takes place in the atmosphere above Venus.		So the game takes place in the atmosphere above Venus.

Reskin at 17:34, 14 April 2026

2026-04-14T17:34:11Z

← Older revision		Revision as of 12:34, 14 April 2026
Line 1:		Line 1:
	[[Image:Venus-Atmosphere.~~png~~\|thumb\|Venus's Middle and Lower Atmospheres]]		[[Image:Venus-Atmosphere.jpg\|thumb\|Venus's Middle and Lower Atmospheres]]

	So the game takes place in the atmosphere above Venus.		So the game takes place in the atmosphere above Venus.

Reskin at 13:15, 13 April 2026

2026-04-13T13:15:41Z

← Older revision		Revision as of 08:15, 13 April 2026
Line 1:		Line 1:
	[[Image:Venus-Atmosphere.png\|thumb]]		[[Image:Venus-Atmosphere.png\|thumb\|Venus's Middle and Lower Atmospheres]]

	So the game takes place in the atmosphere above Venus.		So the game takes place in the atmosphere above Venus.

Reskin: /* Sky Atmosphere Settings for Venus (Atmosphere Only, No Clouds) */

2026-04-09T21:59:32Z

Sky Atmosphere Settings for Venus (Atmosphere Only, No Clouds)

← Older revision		Revision as of 16:59, 9 April 2026
Line 34:		Line 34:
	* Keeping the sun static simplifies computations. With a stationary sun, lighting can be baked for efficiency, and clouds can still cast shadows without needing constant updates.		* Keeping the sun static simplifies computations. With a stationary sun, lighting can be baked for efficiency, and clouds can still cast shadows without needing constant updates.

	== Sky Atmosphere Settings ~~for Venus (Atmosphere Only, No Clouds)~~ ==		== Sky Atmosphere Settings ==

	These settings approximate Venus’s dense CO₂ atmosphere and upper haze.		These settings approximate Venus’s dense CO₂ atmosphere and upper haze.

Reskin at 21:58, 9 April 2026

2026-04-09T21:58:46Z

← Older revision		Revision as of 16:58, 9 April 2026
Line 33:		Line 33:

	* Keeping the sun static simplifies computations. With a stationary sun, lighting can be baked for efficiency, and clouds can still cast shadows without needing constant updates.		* Keeping the sun static simplifies computations. With a stationary sun, lighting can be baked for efficiency, and clouds can still cast shadows without needing constant updates.

			== Sky Atmosphere Settings for Venus (Atmosphere Only, No Clouds) ==

			These settings approximate Venus’s dense CO₂ atmosphere and upper haze.
			They intentionally exclude the sulfuric acid cloud decks (handled separately).

			All color values are linear RGB (0–1).

			=== Planet Setup ===
			* Ground Radius: 6052000 (meters)
			* Atmosphere Height: 100000 (meters)

			=== Rayleigh Scattering (molecular scattering - weak on Venus) ===
			* Rayleigh Scattering Color:
			** R: 0.02
			** G: 0.03
			** B: 0.04

			* Rayleigh Scattering Scale: 0.15

			* Rayleigh Exponential Distribution: 8000

			Notes:
			* Venus has much weaker blue-sky behavior than Earth.
			* Keep this low to avoid Earth-like blue tint.

			=== Mie Scattering (dominant haze / aerosol scattering) ===
			* Mie Scattering Color:
			** R: 0.85
			** G: 0.65
			** B: 0.45

			* Mie Scattering Scale: 8.0

			* Mie Anisotropy: 0.80

			* Mie Exponential Distribution: 12000

			Notes:
			* This is the MOST IMPORTANT parameter group.
			* High scale + strong forward scattering creates:
			** bright glow toward the sun
			** washed-out horizon
			** Venus “golden haze”

			=== Absorption (gas absorption - subtle but important) ===
			* Absorption Color:
			** R: 0.35
			** G: 0.18
			** B: 0.08

			* Absorption Scale: 0.6

			Notes:
			* Adds slight brown/orange attenuation
			* Prevents overly bright or “milky white” atmosphere

			=== Aerial Perspective ===
			* Aerial Perspective View Distance Scale: 0.25
			* Aerial Perspective Start Depth: 0.0

			Notes:
			* Lower value = thicker perceived atmosphere
			* This helps maintain strong distance fade even at altitude

			=== Multi Scattering ===
			* Multi Scattering Factor: 1.0

			Notes:
			* Keep enabled — Venus relies heavily on multiple scattering
			* This is what removes shadows and creates uniform brightness

			=== Ground Albedo ===
			* Ground Albedo Color:
			** R: 0.25
			** G: 0.20
			** B: 0.15

			Notes:
			* Subtle contribution only
			* Prevents unrealistic light bounce

Reskin at 21:49, 9 April 2026

2026-04-09T21:49:18Z

← Older revision		Revision as of 16:49, 9 April 2026
Line 15:		Line 15:

	Modern reviews place the lower cloud layer at about 47.5–50.5 km, and probe data show a sharp increase in extinction just below 50 km, with the lower cloud layer having visible optical depth around 6–12 in some measurements.		Modern reviews place the lower cloud layer at about 47.5–50.5 km, and probe data show a sharp increase in extinction just below 50 km, with the lower cloud layer having visible optical depth around 6–12 in some measurements.

			== Exponential Height Fog and Altitude Adjustments ==

			The exponential height fog represents how atmospheric density changes with altitude. To achieve specific visibility targets at different heights:

			* Start by setting the fog density at the surface level. Adjust this until you achieve, for example, 3 kilometers of visibility near the ground.

			* Next, adjust the height falloff parameter. This controls how rapidly the fog thins out as you go higher. Tune the falloff until you achieve about 10 kilometers of visibility at around 50 kilometers altitude.

			* If the natural exponential transition isn’t layered enough for your needs—for instance, if you want certain altitudes to be foggier or clearer—then you can dynamically adjust density or falloff at different altitude ranges. By tweaking fog parameters in steps, you can approximate a layered atmospheric profile.

			== Static Directional Light (Sun) ==

			In our scenario, Venus’s day is extremely long. Over the course of a gameplay session, the sun’s movement would be imperceptible. Thus, we treat the sun’s directional light as static.

			* The sun’s light itself is pure white; any color shift we perceive (like yellow) is due to atmospheric scattering. On Venus, the color of sunlight will be handled by the Sky Atmosphere actor, which manages how light is scattered through the planet’s atmosphere.

			* Keeping the sun static simplifies computations. With a stationary sun, lighting can be baked for efficiency, and clouds can still cast shadows without needing constant updates.

Reskin at 19:59, 9 April 2026

2026-04-09T19:59:38Z

← Older revision		Revision as of 14:59, 9 April 2026
Line 1:		Line 1:
			[[Image:Venus-Atmosphere.png\|thumb]]

	So the game takes place in the atmosphere above Venus.		So the game takes place in the atmosphere above Venus.

Line 7:		Line 9:
	*Surface visibility: ~3 km		*Surface visibility: ~3 km
	*Kármán line: ~165 km		*Kármán line: ~165 km

	~~[[Image:Venus-Atmosphere.png]]~~

	ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?		ExponentialHeightFog - basically need one setting for below the upper cloud layer (BCL) and one for above the upper cloud layer (ACL) ... or maybe we need to modify it as we change altitude through C++ ... I am not entirely clear yet except that the exponential height fog is much more realistic than what we used to do ... we should not be able to see the ground above ~3 km? Should not be able to see the lower cloud layer until what altitude?