XYZ2EYE.glsl

vec4 uvToEye(vec2 texCoord, float z)    //screen to camera coordinate
{
    const vec4 viewport = vec4(0, 0, 1, 1);
    vec3 ndcPos;
    //ndcPos.xy = ((2.0 * texCoord.xy)-(2.0*viewport.xy))/(viewport.zw)-1;
    ndcPos.xy = 2 *  (texCoord.xy) - vec2(1.0, 1.0);
    ndcPos.z = (2.0 * z - 1.0);
    vec4 clipPos;
    //clipPos.w = camMats.projMat[3][2]/ (ndcPos.z - (camMats.projMat[2][2]/camMats.projMat[2][3]));
    clipPos.w =  camMats.projMat[3][2] / ( ndcPos.z + camMats.projMat[2][2]);
    clipPos.xyz = ndcPos*clipPos.w;
    
    return inverse(camMats.projMat) * clipPos;
}