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# Aeon Realism A realistic, cinematic shader pack for **Iris** — built around one rule: **look expensive, run cheap.** No path tracing. No full-resolution ray tracing. Every stochastic effect — shadows, ambient occlusion, global illumination, reflections, volumetrics — is deliberately under-sampled, dithered with a different pattern each frame, and resolved by TAA. That is what lets the step counts stay low enough for a GTX 1650 while the result still holds up in a screenshot. --- ## Lighting - **Contact-hardening shadows (PCSS).** A blocker search sets the penumbra width, then a Vogel-disk PCF whose radius follows it. The penumbra is derived from a real angular light size, so shadows sharpen at the point of contact and spread out with distance the way they actually do. - **Coloured shadows** through stained glass and water. - **Global illumination** — analytic sky and ground bounce weighted by the surface normal, with an optional screen-space bounce on top. - **Ambient occlusion** sharing its sample positions and depth fetch with GI, so the second effect costs one extra tap rather than a whole new loop. - **Subsurface scattering** — two lobes, so leaves glow when you look at a canopy against the sun and never go black on their shaded side. - Block light remapped from Minecraft's linear ramp to an inverse-square falloff with a colour temperature. Held torches light the world. ## Sky and atmosphere - Analytic single-scattering Rayleigh/Mie atmosphere with an ozone layer and a proper Preetham air mass. No LUTs, no loops. - Warm directional sunlight that shifts from amber at noon to deep orange at sunset, and reaches exactly zero below the horizon. - A large, warm moon with a real phase terminator, limb darkening and mare detail — casting **cold** light, because that is how a dark-adapted eye reads moonlight. - Procedural stars, and a lens flare that only appears when you actually look towards the sun. ## Clouds and volumetrics - Raymarched volumetric clouds with a Beer-Powder light integral, rendered at half resolution. A nearly free cirrus layer on top. - **Volumetric light** at half or quarter resolution with temporal reprojection. Extinction is computed analytically at full resolution instead, which is what stops the low-res buffer producing halos along geometry edges. - God rays through forest canopies, shafts in caves, glow around lava, and beams under water. ## Water - Analytic wave height field — normals come from finite differences of the same function, so there is no normal-map fetch and no tangent-space round trip. - Fresnel-driven transparency: see the bottom looking down, a mirror at a grazing angle. - Screen-space refraction, Beer-Lambert absorption measured from the real water column depth, and caustics derived from the divergence of the wave gradient. - Underwater: wavelength-dependent extinction, light shafts through the surface, and a gentle screen refraction. ## Dimensions - **Overworld** — soft height fog, ground mist at dawn and in rain, aerial perspective on distant terrain. - **Nether** — volumetric haze with a palette derived from the game's own fog colour, so crimson, warped, soul sand valley and basalt deltas each get their own mood instead of one flat red. A height gradient keeps the sense of depth through the murk. - **The End** — deep space sky, a procedural nebula built from two competing pigments rather than a purple filter, three parallax star layers, and end stone with a faint glow of its own. ## Resource pack materials **LabPBR 1.3** is supported: normals, AO, smoothness, F0 / metal index, porosity, subsurface scattering and emission. Where a resource pack does not ship a map, the shader falls back to its own block-id heuristics — vanilla and PBR resource packs coexist in the same world. --- ## Presets | Preset | For | |---|---| | **Potato** | Maximum framerate. 512 shadows, no volumetrics, no clouds, no reflections. | | **Low** | Steady 60+ on weak hardware. 1024 shadows, quarter-res volumetrics. | | **Medium** | Recommended. 1536 shadows with PCSS, half-res volumetrics with temporal reprojection, volumetric clouds, SSR, caustics. | | **High** | 2048 shadows, screen-space GI, long SSR rays. | | **Ultra** | 3072 shadows, maximum sample counts everywhere. | Around 90 individual settings behind those, grouped into fourteen screens, with English and Russian translations. --- ## Requirements - **Iris 1.7+**, Minecraft **1.21.x** (developed and tested on 1.21.10) - OpenGL 3.3 core - Not compatible with OptiFine — the pack uses Iris-specific features (`RENDERTARGETS`, per-buffer blend control, dimension folders). --- ## Honest limitations I would rather you know these up front than find them yourself. - **The shadow "cascades" are analytic, not real cascades.** Iris gives one shadow pass, therefore one projection. Instead of three real slices, the map is distorted so texel density follows an inverse-distance curve, with bias and filter width tuned separately for three zones. The texel distribution is close to a three-slice CSM. It is not a CSM. - **GI, AO and reflections are screen space.** What is not on screen does not contribute. Reflections have a proper sky fallback; GI simply has no off-screen term. - **Local light scattering in the volumetrics is screen space too.** Lava you can see glows into the haze; lava behind you does not. - **No parallax occlusion mapping.** The LabPBR height channel is decoded and ignored. POM needs a per-fragment march through a height map, which is exactly the cost this pack exists to avoid. - **TAA is not cosmetic here, it is the denoiser for the whole pipeline.** Turning it off will make shadows, AO, GI, SSR and the volumetrics visibly noisy. That is the trade the pack is built around. --- ## Русский Реалистичный кинематографичный шейдерпак для **Iris**, собранный вокруг одного правила: **выглядеть дорого, работать дёшево.** Никакого path tracing и ray tracing в полном разрешении. Всё стохастическое — тени, AO, глобальное освещение, отражения, волюметрика — намеренно недосэмплировано, раздизерено разным паттерном каждый кадр и вычищается TAA. Именно это позволяет держать низкие счётчики шагов на уровне GTX 1650. Основное: контактные тени PCSS с настоящим угловым размером источника, цветные тени сквозь витражи и воду, аналитическая атмосфера Рэлея-Ми, тёплое солнце и холодная луна с фазовым терминатором, объёмные облака и volumetric light в половинном разрешении с временной репроекцией, вода с преломлением, поглощением и каустикой, отдельные настроения для биомов Незера и процедурное небо Энда. Поддержан LabPBR 1.3. Пять пресетов от Potato до Ultra, около 90 настроек на четырнадцати экранах, интерфейс на русском и английском. **Требуется Iris 1.7+, Minecraft 1.21.x. С OptiFine несовместим.** Ограничения честно перечислены в английской секции выше — если коротко: каскады теней аналитические, а не настоящие; GI, AO и отражения экранные; POM нет; без TAA будет шумно.