After using the project method for world point, the z is depth value?

Questions
1

After using the project method for world point, the z is depth value?

Vector3 p
p.project()

p.z === gl_FragCoord.z ?

2

After you have projected a vector to NDC space via Vector3.project(), you have to do this (assuming the depth range is [0,1]):

const depthValue = ( 0.5 * p.z ) + 0.5;

I have created two fiddles that show the calculation with Vector3 and Vector4 (which is normally used in the shaders).

Vector3: https://jsfiddle.net/f2Lommf5/15950/
Vector4: https://jsfiddle.net/f2Lommf5/15949/

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