Shaders that support ScreenRefractivity

The following shaders support full-screen refractions using the fRefractivity parameter.

• Shader Txt_Lm_Lc_Rfr (Legacy)

• Shader Txt_Rfr_AnimBm (Legacy)

• Shader Vc_Em_Bm_Rfr_EluxGoccia

• Shader LiquidLevel_Em_Bm_Rfr_Ci (Legacy)

The refraction texture is generated automatically by the engine; this texture is unique for the whole scene and is generated by the back-buffer data.

Possible issues

This technique brings with it some more or less evident defects:

• Reflective polygons are always drawn at the end of the pipeline, so they can cause sorting problems with transparent objects.

• The refraction texture is calculated only once. Therefore, two or more refractive polygons should not overlap, because the back polygon would not be considered as refraction from the front polygon.

• Using DOF and HDR, the refraction texture has neither DOF nor HDR, while the polygons refract.

• Refractions are not supported when rendering CubeMap, RenderToTexture, or DoubleBSP.