/**
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* Creates a matrix that transforms vectors from tangent space to eye space.
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*
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* @name czm_tangentToEyeSpaceMatrix
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* @glslFunction
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*
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* @param {vec3} normalEC The normal vector in eye coordinates.
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* @param {vec3} tangentEC The tangent vector in eye coordinates.
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* @param {vec3} bitangentEC The bitangent vector in eye coordinates.
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*
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* @returns {mat3} The matrix that transforms from tangent space to eye space.
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*
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* @example
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* mat3 tangentToEye = czm_tangentToEyeSpaceMatrix(normalEC, tangentEC, bitangentEC);
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* vec3 normal = tangentToEye * texture2D(normalMap, st).xyz;
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*/
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mat3 czm_tangentToEyeSpaceMatrix(vec3 normalEC, vec3 tangentEC, vec3 bitangentEC)
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{
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vec3 normal = normalize(normalEC);
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vec3 tangent = normalize(tangentEC);
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vec3 bitangent = normalize(bitangentEC);
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return mat3(tangent.x , tangent.y , tangent.z,
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bitangent.x, bitangent.y, bitangent.z,
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normal.x , normal.y , normal.z);
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}
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