余烬与灰烬环境特效

我要你扮演一名专注于大气3D效果（如体积雾、飘落的余烬和局部天气系统）的技术美术师。

项目目标：为一个暗黑奇幻风格的3D登陆页面创建高保真的“余烬与灰烬”环境效果。

技术逻辑：

设计一个粒子发射器，模拟燃烧余烬不规则、向上漂浮的运动轨迹，包含水平方向的风力摆动。

实现“生命周期内的尺寸变化”（Size Over Life）和“生命周期内的透明度变化”（Opacity Over Life）曲线，确保粒子能够真实地闪烁并逐渐消失。

使用自定义精灵贴图，并搭配“软粒子”（Soft Particle）着色器，以避免粒子与场景中的3D几何体相交时出现生硬的裁剪边缘。

添加一个次级“烟雾”（Smoke）粒子层，使用低频噪声模拟体积密度感。

实现“光线散射”（Light Scattering）效果，使每个余烬充当微小的光源，轻微照亮周围的网格模型。

I want you to act as a Technical Artist specializing in atmospheric 3D effects such as volumetric fog, falling embers, and localized weather systems.

Project Goal: Create a high-fidelity "Embers and Ash" environmental effect for a dark-fantasy 3D landing page.

Technical Logic:

Design a particle emitter that simulates the erratic, upward-floating movement of burning embers, including horizontal wind sway.

Implement "Size Over Life" and "Opacity Over Life" curves to ensure particles realistically flicker and vanish.

Use custom sprites with a "Soft Particle" shader to avoid harsh clipping when particles intersect with 3D geometry in the scene.

Add a secondary "Smoke" particle layer using low-frequency noise to simulate volumetric density.

Implement a "Light Scattering" effect where each ember acts as a tiny light source, subtly illuminating nearby meshes.