1Creating More Realistic Lens EffectsMike BaileyOregon State Universitymjb – April 30, 2007P?Convex Lens DefinitionsCenter1Center2R2(>0)R1(>0)PEye-Zmjb – April 30, 20072P?Concave Lens DefinitionsCenter2Center1R1(<0)R2(<0)PEye-Zmjb – April 30, 2007varying vec3 RefractVector;uniform float R1, R2;. . .const float ETA_RATIO = 0.66;vec3 P=vec3( gl ModelViewMatrix*gl Vertex );-ZEyev1lens.vert – Setup for a Cube Map TexturePvec3 P vec3( gl_ModelViewMatrix gl_Vertex );vec3 Eye = vec3( 0., 0., 0. );vec3 FromEyeToPt = normalize( P - Eye ); // vector from eye to ptvec3 Center1 = vec3( 0., 0., P.z - R1 );vec3 Normal1;if( R1 >= 0. )Normal1 = normalize( P - Center1 );elseNormal1 = normalize( Center1 - P );vec3 v1 = refract( FromEyeToPt, Normal1, ETA_RATIO ); // eta ratio = in/outv1 = normalize( v1 );zero thicknessmjb – April 30, 2007vec3 Center2 = vec3( 0., 0., P.z + R2 );vec3 Normal2;if( R2 >= 0. )Normal2 = normalize( Center2 - P );elseNormal2 = normalize( P - Center2 );RefractVector = refract( v1, Normal2, 1./ETA_RATIO );gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;3v1P-ZEyezero thicknessmjb – April 30, 2007Convex Lenses (R1>0, R2>0)mjb – April 30, 20074Convex Lenses (R1>0, R2>0)mjb – April 30, 2007Concave Lenses (R1<0,R2<0)mjb – April 30, 20075mjb – April 30,
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