Please reuse the field EntityRenderer.thirdpersonDistance because we modders use them if we are riding huge entities

thirdpersonDistance is the distance of your camera when in third person, it has a default value of 4.0F, it is private but with reflections we can utilize it.

In older versions we used

            double d3 = (double)(this.thirdPersonDistancePrev + (thirdPersonDistance - this.thirdPersonDistancePrev) * partialTicks);

Now we use

            double d3 = (double)(this.thirdPersonDistancePrev + (4.0F - this.thirdPersonDistancePrev) * partialTicks);