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@animech-public/playcanvas

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PlayCanvas WebGL game engine

playcanvas.com

AnimechTechnologies/playcanvas-engine

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var n="\nuniform float tbnBasis;\nvoid getTBN(vec3 tangent, vec3 binormal, vec3 normal) {\n\tvec2 uv = $UV;\n\tvec3 dp1 = dFdx( vPositionW );\n\tvec3 dp2 = dFdy( vPositionW );\n\tvec2 duv1 = dFdx( uv );\n\tvec2 duv2 = dFdy( uv );\n\tvec3 dp2perp = cross( dp2, normal );\n\tvec3 dp1perp = cross( normal, dp1 );\n\tvec3 T = dp2perp * duv1.x + dp1perp * duv2.x;\n\tvec3 B = dp2perp * duv1.y + dp1perp * duv2.y;\n\tfloat denom = max( dot(T,T), dot(B,B) );\n\tfloat invmax = (denom == 0.0) ? 0.0 : tbnBasis / sqrt( denom );\n\tdTBN = mat3(T * invmax, -B * invmax, normal );\n}\n";export{n as default};