Ray-MMD is a free and powerful library extension for MikuMikuDance, providing an easy way to add physically based rendering with a high degree of customization. It is written in HLSL for the DirectX 9 environment and built on top of MikuMikuEffect.

- Fixed SSGI radius calculation to use viewport extent instead of height-only scaling for correct aspect ratio handling.
- Fixed out-of-bounds sampling artifacts at screen edges via boundary validation.
- Added SSGI temporal accumulation adapted from the DD_RAY branch.
- Added an SSGI history buffer to reuse previous-frame GI and improve stability.
- Added an SSGI camera reprojection buffer for temporal history lookup.
- Added a two-pass A-Trous spatial filter for SSGI before temporal accumulation.
- Added neighborhood clamping for SSGI temporal history to reduce ghosting and color bleeding.
- Updated SSGI composite to use temporally accumulated GI instead of raw blended GI.
- Fixed SSAO mode (SSAO_TYPE 0) failing to compile due to missing shared utility functions.
- Fixed ShadowMapSamp being disabled together with SSGI due to preprocessor conditions.
- Added SSGIMap subset support to control which subsets contribute to or receive SSGI effects.
- Added SSAO & HBAO Blend (AO contribution now fades through blending instead of disappearing completely under direct lighting).
- Added Screen Space Global Illumination (adapted from Rui's SSGI approach).
- Added Specular Antialiasing to material_common_2.0.fxsub.
- Updated the fallback value for customData when use_texture is false from black (0) to MaterialDiffuse.rgb to preserve the material's base color.
- Fixed incorrect normals on two-sided materials.
- Added SSAO & HBAO settings for Ambient Occlusion.
- Updated to use DD Material Alpha V2 Experimental (use Ray Default Main/Material for transparent materials).
- Updated specular antialiasing to use partial derivatives of interpolated vertex normals to generate a geometric smoothness term that approximates curvature.
- Added MatCap support for fisheye and environment maps in Main.fx.
- Fixed emissive rendering through transparent materials.
- Fixed volumetric cube rotation (now supports full 360° rotation on X, Y, and Z axes).
- Fixed rectangle light orientation in subsurface shading.
- Fixed tube light shadow holes when width exceeds 0.150.