OPAL v1.2.0 Changelog:

Fog:

• decreased Atmospheric Fog brightness and general density in the Overworld
• added "Altitude Density Gradient" option [applies fog density gradient between y75 and y320 in the Overworld]
• added "Gradient Intensity" option [affects gradient intensity of "Altitude Density Gradient" option]
• Atmospheric Fog density is now slightly decreased at higher altitudes
• increased fog density in all cave variants [it's back to how it was in OPAL v1.0.1]
• increased fog density for all sandstorm variants [it's back to how it was in OPAL v1.0.1 + Altitude Density Gradient]
• decreased fog density for all rain variants and for cloudy weather in savanna
• snowfall fog density is slightly tweaked [similar fog density + Altitude Density Gradient]

Copper Age Drop:

• improved emissive textures of Copper Torches and all Copper Lanterns
• hanging Copper Lanterns are now affected by wind

OPAL v1.1.2 Changelog:

Foliage:

• Wildflowers, Bush, Firefly Bush, Dry Grass and Cactus Flower now have subsurface scattering
• Dead Bush, Bush, Firefly Bush, Dry Grass and Cactus Flower are now affected by wind

OPAL v1.1.1 Changelog:

Entities:

• increased Creaking eyes brightness and contrast

Foliage:

• Eyeblossoms are now affected by wind and have subsurface scattering
• improved brightness of Eyeblossoms

Water:

• added options to change underwater colors and fog density in Pale Garden biome
• improved underwater colors and slightly increased underwater fog density in Pale Garden biome

OPAL v1.1.0 Changelog:

Distant Horizons:

• added Distant Horizons support (credits to Capt Tatsu)

Fog:

• decreased Ground Fog density when Distant Horizons mod is detected
• Cylindrical Distant Fade is now enabled by default
• improved Atmospheric Fog colors and brightness
• decreased Atmospheric Fog density

Lighting & Foliage:

• added Cloud Shadows (credits to Capt Tatsu)
• added option to disable or enable Cloud Shadows (credits to Capt Tatsu)
• Pale Oak Leaves, Pale Oak Sapling and Pale Hanging Moss are now affected by wind and have subsurface scattering

OPAL v1.0.1 Changelog:

• fixed shaders not loading on new Iris versions

OPAL v1.0.0 Changelog:

Lighting, Textures, Foliage and Blur:

• added "Vanilla Side Shading Intensity" option [affects block and entity sides]
• added "Vanilla Corner Shading Intensity" option [affects corners between blocks]
• greatly decreased Vanilla shading intensity [both side and corner]
• lava is no longer affected by vanilla shading
• slightly decreased regular lava brightness
• slightly increased nether lava brightness
• slightly decreased Ambient Occlusion strength
• expanded "Ambient Occlusion Strength" option slider
• blocklights are now less visible in the sunlight
• improved emissive textures of Magma Cubes, Nether Portals, Torches and Endrods
• decreased sand blocks brightness
• improved foliage lighting and brightness
• Weeping Vines are now slightly brighter
• Twisting Vines are now less affected by the wind
• improved all block waving strength option sliders
• added new "Distant" mode for Depth of Field option

Overworld:

• improved morning/evening colors and color transitions
• overhauled night colors
• moon light brightness is now affected by moon phases
• added "Moon Phases" option
• added sliders to control moon light brightness for each moon phase
• sun and moon will now hide under the horizon
• improved skybox sun and moon colors and brightness transitions
• renamed "Skybox Brightness Transition" option to "Skybox Color Transition"
• improved horizon sky fog during mornings/evenings
• slightly reduced sunlight-colored fog in the mornings/evenings
• added "Ground Fog" option
• added dynamic ground fog [density builds up at night and decreases in the morning]
• added "Ground Fog Density" option
• increased cloud view distance during clear weather
• improved cloud colors and brightness during day/night
• greatly improved cloud color and brightness transitions during mornings/evenings
• improved brightness transition between bright and dark areas
• slightly improved Magma Block and Sulk Sensors blocklights
• expanded "Light Shaft Strength" option slider
• increased light shaft strength during sandstorms
• added "Sandstorm Dusty Light Shafts" option
• light shafts are now dusty during sandstorms [this feature works only on Iris]
• improved sandstorm colors

Nether:

• overhauled colors and brightness for each Nether biome
• added "Nether Fog Mode" option
• Nether fog is now advanced [biome fog + lava fog; multiple density gradients]
• increased view distance in the Nether thanks to the new fog mode
• "Per Biome Weather" option no longer affects Nether
• added "Per Biome Nether" option
• biome fog density now changes depending on a Nether biome
• added options to change fog density of every Nether biome
• added option to change Nether lava fog density
• added options to change lava and biome fog intensities
• added options to change lava fog colors
• color and brightness transitions are now less visible while crossing biome borders
• "Windy Caves" and "Dynamic Wind" options no longer affect Nether
• added "Nether Wind Waving Strength" option
• Nether is now slightly windy
• added options to change blocklight color only in the Nether
• added options to change bloom only in the Nether
• added options to change chromatic aberration only in the Nether

End:

• improved End colors and brightness
• added "End Skybox Brightness" option
• decreased brightness of skybox in the End
• added brightness gradient for skybox in the End
• added "End Fog Density" option
• improved End fog
• added "End Smokey Light Shafts" option
• light shafts are now smokey in the End (credits to Capt Tatsu)
• added "End Light Shaft Strength" option
• increased light shaft strength in the End
• "Windy Caves" and "Dynamic Wind" options no longer affect End
• added "End Wind Waving Strength" option
• End is now slightly windy
• added options to change blocklight color only in the End
• blocklight color in the End is now white-ish
• added options to change bloom only in the End
• increased and adjusted bloom in the End to the new foggy aesthetic
• added options to change chromatic aberration only in the End
• enabled chromatic aberration in the End